Journal articles: 'Polysiloxane'

1

Garrido, Leoncio. "NMR of Tissues Exposed to Polysiloxane Gels." Rubber Chemistry and Technology 71, no. 1 (March 1, 1998): 95–104. http://dx.doi.org/10.5254/1.3538476.

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Abstract Silicone (polysiloxanes) gel-filled implants have been widely used for biomedical applications, mainly because they were considered to be nonbiodegradable. However, increasing concern about the health implications of polysiloxane exposure for women with silicone gel-filled breast implants has prompted interest to study the biochemistry of implanted polysiloxanes. The purpose of this work is to investigate the migration of polysiloxanes from the implant to local and distant sites and their chemical modification in living systems. Tissues from animals and humans exposed to polysiloxane gel implants are studied in vivo using proton NMR localized spectroscopy, and in vitro with proton and 29Si magic angle spinning (MAS) NMR spectroscopy. This work demonstrates that free polysiloxanes present in the gel-filled implants migrate to surrounding tissues and distant organs, such as the liver. In addition, 29Si NMR spectra of metabolically active tissues (liver) show the presence of chemically unchanged polysiloxanes and other silicon-containing compounds (silica) which suggest that these polymers are biodegradable.

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Xiaofeng, Su, Yu Yitao, Li Bing, Wang Jing, Lu Chuan, Zong Jianping, Li Jinhui, and Wang Feng. "Synthesis and characterization of polyurethane–polysiloxane block copolymers modified by α,ω-hydroxyalkyl polysiloxanes with methacrylate side chain." Science and Engineering of Composite Materials 28, no. 1 (January 1, 2021): 528–39. http://dx.doi.org/10.1515/secm-2021-0052.

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Abstract In order to prepare polyurethane–polysiloxane block copolymers, α,ω-hydroxyalkyl polysiloxanes with methacrylate side chain and α,ω-bis(2-methyl-3-hydroxypropyl)polymethyl(2-methyl-methylpropanoate) siloxanes, were synthesized and characterized in this study. The syntheses process included hydroxyl protection, hydrosilylation, deprotection, and ring-opening equilibrium reactions. The intermediates and target products were characterized by Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance methods. The characterization results showed that each step was successfully carried out in all the cases. Then the waterborne polyurethane–polysiloxane block copolymers were prepared via step-growth polymerization. The properties of the block copolymer films were characterized by thermal gravimetric analysis, differential scanning calorimetry, and dynamic thermomechanical analysis methods in detail. The experimental results showed that the block introduction of hydroxyalkyl polysiloxane could reduce the water absorption of waterborne polyurethane from 62 to 11%, and significantly improve the water resistance of polyurethane. With the introduction of polysiloxane, the tensile strength decreased and the elongation at break increased. At the same time, with the increase of the polysiloxane content, the glass transition temperature of the soft segment decreased to −56.4°C and the thermal decomposition temperature increased to 300°C. The results revealed that the introduction of polysiloxane could effectively improve the comprehensive performance of polyurethane–polysiloxane block copolymer films.

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Xiaofeng, Su, Yu Yitao, Li Bing, Wang Jing, Lu Chuan, Zong Jianping, Li Jinhui, and Wang Feng. "Synthesis and characterization of polyurethane–polysiloxane block copolymers modified by α,ω-hydroxyalkyl polysiloxanes with methacrylate side chain." Science and Engineering of Composite Materials 28, no. 1 (January 1, 2021): 528–39. http://dx.doi.org/10.1515/secm-2021-0052.

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Abstract In order to prepare polyurethane–polysiloxane block copolymers, α,ω-hydroxyalkyl polysiloxanes with methacrylate side chain and α,ω-bis(2-methyl-3-hydroxypropyl)polymethyl(2-methyl-methylpropanoate) siloxanes, were synthesized and characterized in this study. The syntheses process included hydroxyl protection, hydrosilylation, deprotection, and ring-opening equilibrium reactions. The intermediates and target products were characterized by Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance methods. The characterization results showed that each step was successfully carried out in all the cases. Then the waterborne polyurethane–polysiloxane block copolymers were prepared via step-growth polymerization. The properties of the block copolymer films were characterized by thermal gravimetric analysis, differential scanning calorimetry, and dynamic thermomechanical analysis methods in detail. The experimental results showed that the block introduction of hydroxyalkyl polysiloxane could reduce the water absorption of waterborne polyurethane from 62 to 11%, and significantly improve the water resistance of polyurethane. With the introduction of polysiloxane, the tensile strength decreased and the elongation at break increased. At the same time, with the increase of the polysiloxane content, the glass transition temperature of the soft segment decreased to −56.4°C and the thermal decomposition temperature increased to 300°C. The results revealed that the introduction of polysiloxane could effectively improve the comprehensive performance of polyurethane–polysiloxane block copolymer films.

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Cai, Yuan Jing, Chao Can Zhang, Li Li Wu, and Run Hua Hu. "Mechanical Damping Properties of Silicone Rubber Prepared by Nano-SiO₂ and AGE-Modified Polysiloxane Blends." Advanced Materials Research 337 (September 2011): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amr.337.41.

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The synthesis of AGE modified polysiloxane was realized by block copolymerization. Using degradation method and different ratio of raw materials, different content of AGE side chains and molecular weight of AGE modified polysiloxanes had been obtained. AGE modified silicone rubber was prepared by Nano-SiO2and AGE-Modified Polysiloxane Blends. The relationship between the molecular weight of AGE modified polysiloxane, the content of AGE modified side chains and the mechanical properties of AGE modified silicone rubber had been studied. The results showed that AGE modified silicone rubber had better mechanical damping properties than silicone rubber without modification of AGE: lower Tg (-56°C), higher tanδ (0.26), the maximum tensile/rear strengths with appropriate dynamic viscosity (17500mP•s) and the characterization of decreasing tensile/tear strengths with the increasing content of the AGE modified side chains.

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Guan, Rui Fang, Jian Rong Wang, and Yu Rong Dong. "The Syntheses and Mark-Houwink Empirical Formula of Polysiloxanes Containing Cyanoethyl Groups as Side Substituents." Advanced Materials Research 239-242 (May 2011): 2765–68. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2765.

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Polysiloxanes containing cyanoethyl groups (PDMS-CN) is a useful functional polysiloxanes. In this paper a new method was employed to prepare the polysiloxane with various number average molecular weight (Mn) and cyanoethyl groups. Mns of PDMS-CN were determined by GPC and the relationships between the instrinsic viscosity ([η]) and Mn of PDMS-CN were given. The contents of cyanoethyl groups were determined by FT-IR and 1H NMR.

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A. Jadhav, Sushilkumar, Roberta Bongiovanni, Daniele L. Marchisio, Daniela Fontana, and Christian Egger. "Surface modification of iron oxide (Fe2O3) pigment particles with amino-functional polysiloxane for improved dispersion stability and hydrophobicity." Pigment & Resin Technology 43, no. 4 (July 1, 2014): 219–27. http://dx.doi.org/10.1108/prt-07-2013-0057.

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Purpose – The purpose of the present study is to use an amino-functional polysiloxane for the surface modification of red iron oxide (Fe2O3) pigment particles for their improved dispersion stability and hydrophobicity and to study the chemical interactions of polysiloxanes with the particle surface. Design/methodology/approach – Surface-treated red Fe2O3 pigment particles were prepared by treatment of the particles with different quantities of the (aminopropylmethylsiloxane)-dimethylsiloxane copolymer in concentrated suspensions in water. The samples were analysed with different instrumental and spectroscopic techniques to study the interaction of the polysiloxane with the particle surface and the effect of the surface treatment of the particles on their dispersion stability and hydrophobicity. Findings – Chemisorption of the amino-polysiloxane onto the surface of Fe2O3 particles resulted in stable layers which turned out to be helpful in improving greatly the dispersion stability of the particles as shown by the Static Light Scattering and Dynamic Light Scattering results. Formation of a polysiloxane coating onto the surface of the pigment particles was confirmed by studying the interactions of the polymer molecules with Fe2O3 surfaces by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy techniques. Practical implications – The surface-treated red Fe2O3 particles with improved dispersion stability can be important components of various formulations in applications such as the colouring of the cement or inorganic pigment-based paint formulations. Originality/value – The study provides mechanistic insights about the interactions of amino-polysiloxane with the red Fe2O3 particles. The process of surface modification of red Fe2O3 particles with the amino-functional polysiloxane showed increased hydrophobicity and dispersion stability which is an important requirement of the pigment-based formulations in real applications.

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Schimmel, K. H. "Polysiloxane. 3. Aminolytische Spaltung von Polysiloxan-Modellverbindungen." Acta Polymerica 38, no. 8 (August 1987): 495–98. http://dx.doi.org/10.1002/actp.1987.010380809.

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8

Zhang, Qing, and Guixian Su. "Preparation of amino functional polysiloxane–lanthanide (Dy3+ and Sm3+) composites." Polymers and Polymer Composites 27, no. 5 (March 19, 2019): 279–86. http://dx.doi.org/10.1177/0967391119837837.

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Polysiloxane with amino group as the functional side chain was prepared via equilibrium polycondensation reaction. It was modified with salicylaldehyde and then incorporated with lanthanide ions (Dy3+ and Sm3+) to obtain two luminescent functionalized polysiloxane–lanthanide composite materials. The structures and properties of products were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, ultraviolet–visible absorption spectroscopy, fluorescent emission spectroscopy, and thermogravimetric analysis. The results show that two kinds of lanthanide ions were all incorporated successfully with the functionalized polysiloxanes. The coordination effect exists between the nitrogen atoms on the ligand and the lanthanide ions. In addition, the green and red light emissions that are characteristic of Dy3+ and Sm3+ were achieved.

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9

Wang, Wencai, Xueyang Bai, Siao Sun, Yangyang Gao, Fanzhu Li, and Shikai Hu. "Polysiloxane-Based Polyurethanes with High Strength and Recyclability." International Journal of Molecular Sciences 23, no. 20 (October 20, 2022): 12613. http://dx.doi.org/10.3390/ijms232012613.

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Polysiloxanes have attracted considerable attention in biomedical engineering, owing to their inherent properties, including good flexibility and biocompatibility. However, their low mechanical strength limits their application scope. In this study, we synthesized a polysiloxane-based polyurethane by chemical copolymerization. A series of thermoplastic polysiloxane-polyurethanes (Si-TPUs) was synthesized using hydroxyl-terminated polydimethylsiloxane containing two carbamate groups at the tail of the polymer chains 4,4′-dicyclohexylmethane diisocyanate (HMDI) and 1,4-butanediol as raw materials. The effects of the hard-segment content and soft-segment number average molecular weight on the properties of the resulting TPUs were investigated. The prepared HMDI-based Si-TPUs exhibited good microphase separation, excellent mechanical properties, and acceptable repeatable processability. The tensile strength of SiTPU-2K-39 reached 21.5 MPa, which is significantly higher than that of other flexible polysiloxane materials. Moreover, the tensile strength and breaking elongation of SiTPU-2K-39 were maintained at 80.9% and 94.6%, respectively, after three cycles of regeneration. The Si-TPUs prepared in this work may potentially be used in gas separation, medical materials, antifouling coatings, and other applications.

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10

Zhang, Xiao Ning, Jin Shui Yao, and Xi Jun Sun. "Synthesis of Chiral Polysiloxane via Hydrosilylation between Synthesized Hydrogen-Containing Polysiloxane and a Chiral Unsaturated Amide." Advanced Materials Research 554-556 (July 2012): 801–6. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.801.

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In this article, we synthesized some hydrogen-containing polysiloxanes by ring-openging polymerization of cyclosiloxanes and studied their viscosity-average molecular weights (η) and active hydrogen content respectively. Then we prepared a chiral amide compound by condensation reaction of acryloyl chloride and (1S)-1-phenylethanamine. Subsequently, we successfully carried out hydrosilylation reaction with the chiral amide and one of hydrogen-containing polysiloxane. In addition, the structures of the target molecules have been confirmed by IR and 1H NMR spectra, elemental analysis and polarimetric analysis.

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Liu, Yang, Xu Long, Yang Wang, Chuan Wu, Zhirong Qu, Zhiwei Pei, Chunlong Shi, Ting Wang, and Hong Dong. "Preparation of Monotrimethoxylsilylethyl-Terminated Polysiloxane Fluids and Their Application in Thermal Interface Materials." Polymers 15, no. 16 (August 8, 2023): 3334. http://dx.doi.org/10.3390/polym15163334.

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In this study, α-Trimethylsilylmethyl-ω-dimethylsilyl-terminated polydimethylsiloxane, polydiethylsiloxane and poly[2,2,2-trifluoropropyl(methyl)siloxane] are synthesized using an anion catalyzed nonequilibrium polymerization reaction with trimethylsilylmethyl lithium as the initiator; hexamethylcyclotrisiloxane, hexaethylcyclotrisiloxane or 1,3,5-trimethyl-1,3,5-trifluoropropylcyclotrisiloxane as the monomer; and dimethylchlorosilane as an end-capping agent. Three kinds of α-trimethylsilylmethyl-ω-trimethoxylsilylethyl-terminated polysiloxanes are further prepared by hydrosilylation reaction of α-trimethylsilylmethyl-ω-dimethylsilyl-terminated polysiloxanes with vinyltrimethoxysilane using Karstedt’s catalyst. These α-trimethylsilylmethyl-ω-trimethoxylsilylethyl-terminated polysiloxanes are functionalized as in situ surface treatment agents for AlN particles. The effects of the structure of these polysiloxanes on the dispersion of AlN in the polysiloxane matrix and on the heat transfer performance of silicone pastes and silicone rubbers are investigated. A possible mechanism of surface treatment of AlN fillers by these novel silicone fluids is also discussed.

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Guan, Rui Fang, and Yu Rong Dong. "The Properties and Hydrolysis of Polysiloxanes with Cyanoethyl Groups." Advanced Materials Research 306-307 (August 2011): 1663–66. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1663.

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Polysiloxanes with cyanoethyl groups (PDMS-CN) is a useful functional polysiloxanes. In this paper, the polysiloxane with various number average molecular weight (Mn) and cyanoethyl groups were prepared. Mns of PDMS-CN were determined by GPC. The contents of cyanoethyl groups were determined by 1H NMR. The dynamic mechanical properties and thermal stability of PDMS-CN were investigated by DSC and TGA respectively. The hydrolysis of PDMS-CNs give the polysiloxanes with carboxyl groups. The factors influencing the hydrolysis of cyanoethyl groups were discussed by orthogonal array and the optimal reaction conditions were confirmed. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text

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Du, Dan, Xupeng Chen, Yue Wu, Chuan Wu, Zhirong Qu, Yanjiang Song, Dawei Qin, Qiao Li, and Hong Dong. "The Preparation of Acryloxyl Group Functionalized Siloxane Polymers and the Study of Their Ultra Violet Curing Properties." Polymers 16, no. 4 (February 7, 2024): 465. http://dx.doi.org/10.3390/polym16040465.

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Polysiloxane with multiple acryloxyl groups at the terminal site of the polymer chain was synthesized by the condensation reaction between hydroxyl-terminated polysiloxane and acryloyl chloride and used to improve the cross-linking density of UV-curable silicone materials initiated from dual acryloxy-terminated symmetric polysiloxane or single acryloxy-terminated asymmetric polysiloxane with the mixture of Irgacure 1173 and Irgacure 184 at a mass ratio of 1:1 as the photoinitiator. The effects of factors such as initiator composition, UV irradiation time, structure, and molecular weight of linear dual acryloxy-terminated or single acryloxy-terminated asymmetric siloxane oligomers on the gelation yield, thermal properties, water absorption, and water contact angle of UV-cured film were investigated. The synthesized cross-linking density modifier can be copolymerized with acryloxy-functionalized linear polysiloxanes under the action of a photoinitiator to increase the cross-link density of UV-cured products effectively. Both linear dual acryloxy-terminated or single acryloxy-terminated asymmetric siloxane oligomers can be copolymerized with cross-link density modifiers within 20 s of UV irradiation. The gelation yields of the UV-cured products obtained from the dual acryloxy-terminated siloxane oligomers were greater than 85%, and their surface water contact angles increased from 72.8° to 95.9° as the molecular weight of the oligomers increased. The gelation yields of UV-cured products obtained from single acryloxy-terminated asymmetric siloxane oligomers were less than 80%, and their thermal stabilities were inferior to those obtained from the dual acryloxy-terminated siloxane oligomers. However, the water contact angles of UV-cured products obtained from these single acryloxy-terminated asymmetric siloxane oligomers were all greater than 90°.

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Baranovskii, Egor M., Victoria V. Khistiaeva, Konstantin V. Deriabin, Stanislav K. Petrovskii, Igor O. Koshevoy, Ilya E. Kolesnikov, Elena V. Grachova, and Regina M. Islamova. "Re(I) Complexes as Backbone Substituents and Cross-Linking Agents for Hybrid Luminescent Polysiloxanes and Silicone Rubbers." Molecules 26, no. 22 (November 14, 2021): 6866. http://dx.doi.org/10.3390/molecules26226866.

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This study focuses on the synthesis of hybrid luminescent polysiloxanes and silicone rubbers grafted by organometallic rhenium(I) complexes using Cu(I)-catalyzed azido-alkyne cycloaddition (CuAAC). The design of the rhenium(I) complexes includes using a diimine ligand to create an MLCT luminescent center and the introduction of a triple C≡C bond on the periphery of the ligand environment to provide click-reaction capability. Poly(3-azidopropylmethylsiloxane-co-dimethylsiloxane) (N3-PDMS) was synthesized for incorporation of azide function in polysiloxane chain. [Re(CO)3(MeCN)(5-(4-ethynylphenyl)-2,2′-bipyridine)]OTf (Re1) luminescent complex was used to prepare a luminescent copolymer with N3-PDMS (Re1-PDMS), while [Re(CO)3Cl(5,5′-diethynyl-2,2′-bipyridine)] (Re2) was used as a luminescent cross-linking agent of N3-PDMS to obtain luminescent silicone rubber (Re2-PDMS). The examination of photophysical properties of the hybrid polymer materials obtained show that emission profile of Re(I) moiety remains unchanged and metallocenter allows to control the creation of polysiloxane-based materials with specified properties.

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Nguyen, Vu Viet Linh, Thi Hang Pham, and Dai Phu Huynh. "The influence of polysiloxane on the mechanical properties and water repellency of cotton fabrics." Ministry of Science and Technology, Vietnam 66, no. 1 (January 25, 2024): 50–55. http://dx.doi.org/10.31276/vjst.66(1).50-55.

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Cotton fabric is commonly used in the textile industry owing to good ventilation and absorption capacity. However, dirt resistance and water resistance of cotton fabrics are low. Therefore, coating cotton fabrics with water-repellent polysiloxane is a special requirement for outdoor and protective clothing products. The effects of polysiloxane content on the water resistance and mechanical properties of materials were studied. The morphology of coated cotton fabric was characterised by SEM (Scanning electron microscope), and EDX (Energy dispersive X-ray) was used to determine the presence of polysiloxane on the surface of cotton fabric. The effects of polysiloxane content on the water resistance and mechanical properties of materials were studied. Compared with raw cotton fabrics, the tensile strength of the cotton fabrics impregnated with 20%wt polysiloxane solution increased, but the elongation at break was reduced. The hydrostatic pressure (AATCC 127) and water spray test (AATCC 22) results showed that the water repellence of polysiloxane-coated cotton fabrics increased significantly compared to pure cotton fabrics. In addition, the polysiloxane content has no almost effect on the water repellency of the material. Therefore, the appropriate use of polysiloxane can contribute to minimising the cost of the product.

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Romero, J. D., M. Khan, H. Fatemi, and J. Turlo. "Outgassing behavior of spin-on-glass (SOG)." Journal of Materials Research 6, no. 9 (September 1991): 1996–2003. http://dx.doi.org/10.1557/jmr.1991.1996.

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The outgassing behavior and mechanical properties of polysiloxane based and phosphorus doped silicate based films as planarization candidates for device processing were evaluated using various analytical techniques. After curing between 370 °C and 450 °C, a high temperature rebake above 410 °C caused twice the weight loss in polysiloxane based films as in silicate films. This means that further outgassing, which could occur to a greater degree from polysiloxane than from silicate, could lead to a more probable blistering within the interlayer of the sandwiched spin-on-glass (SOG) during subsequent thermal processing. However, a well-cured polysiloxane would be a better candidate for planarization applications because the film was found to absorb less moisture and had lower stress than the silicate. Due to high silanol content and high porosity in silicate, it was found to absorb six times more water than polysiloxane. When water evolved, significantly higher stress levels were observed in silicate than in polysiloxane during thermal cycle tests. Infrared spectroscopic analysis revealed that polysiloxane contained Si–O–CH3 moiety, which rendered the film flexible, while silicate contained near-stoichiometric SiO2 bonds, which made for a more rigid and dense structure. This difference in the film structures translated to three times higher stress in silicate than in polysiloxane. During device processing, it was seen that silicate films were more prone to cracking than polysiloxane films. The components of the outgassing materials were either volatile organic species from residual solvents not completely burned out during cure, or carbon dioxide and water vapor as by-products from further cure. Gas chromatography indicated that both types of films contained volatile organic residues when cured at 370 °C. However, at 410 °C, volatile organic species were present in the polysiloxane but not in the silicate. A 30 to 60 min cure at temperature greater than 410 °C was then found to adequately cure polysiloxane. It was concluded that a “well cured” polysiloxane based spin-on-glass (SOG) would be more suitable than a silicate based SOG for planarization application.

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Yahya, Sufiah Mohamad, A. Azmi, Maizlinda Izwana Idris, Muhamad Zaini Yunos, Shahruddin Mahzan, Sufizar Ahmad, and Hariati Taib. "Short Review: Role of Metal Oxides as Filler in Polysiloxane Sheet Composite." Applied Mechanics and Materials 465-466 (December 2013): 27–31. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.27.

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Additional of fillers such as silica (SiO2), alumina (Al2O3), zinc oxide (ZnO), Zirconium carbide ( ZrC) and Zirconia (ZrO2) would affect the properties of the polysiloxane sheet, that can be applied in various applications. Polysiloxane sheet composites are largely use today with various materials as fillers. The fabrication techniques of the polysiloxane composite sheets include micro-moulding, casting moulding and injection moulding. Application of different fabricating process, physical and mechanical properties of polysiloxane sheet composites. Thus, this paper complies various studies with regards to the various properties of polysiloxane sheet composites established by incorporation of different fabrication technique and fillers.

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Cui, Zhengshan, Wanxia He, Jun Liu, Wei Wei, Liang Jiang, Jun Huang, and Xiaomeng Lv. "Fabrication of polysiloxane-modified polyurethane sponge as low-cost organics/water separation and selective absorption material." Water Science and Technology 74, no. 8 (August 9, 2016): 1936–45. http://dx.doi.org/10.2166/wst.2016.348.

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Through sol-gel and dip-coating processes, commercial polyurethane sponge modified by polysiloxane was fabricated under low temperature (60 °C) and atmosphere. The contact angle of the obtained polysiloxane/polyurethane sponge is 145 ± 5°. Hence, the polysiloxane/polyurethane sponge could float on water and selectively absorb organics from the surface of the water, indicating simultaneous properties of hydrophobicity and oleophilicity. The absorbent maximum value is 50–150 times of its own weight. The polysiloxane/polyurethane sponge exhibited excellent recyclability, which could be reused by squeezing the sponge due to its high mechanical stability and flexibility. Thermogravimetry-differential thermal analysis test indicated that the polysiloxane/polyurethane sponge exhibited good thermal stability and the stable contact angle of samples tested under increasing temperature indicated its good weather resistance. Due to the commercial property of polyurethane sponge and easy-handling of polysiloxane, the polysiloxane/polyurethane sponge can be easily scaled up to recover a large-area oil spill in water and further work based on the designed equipment has been under consideration.

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Yu, Yitao, Jing Wang, and Xu Wang. "Synthesis and properties of polysiloxane graft waterborne polyurethane modified with α-N,N-dihydroxyethylaminopropyl-ω-butylpolydimethylsiloxane." Journal of Polymer Engineering 33, no. 6 (September 1, 2013): 527–33. http://dx.doi.org/10.1515/polyeng-2013-0050.

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Abstract In this study, α-N,N-dihydroxyethylaminopropyl-ω-butylpolydimethylsiloxane was used to prepare waterborne polyurethane-polysiloxane graft copolymer dispersions. α-N,N-dihydroxyethylaminopropyl-ω-butylpolydimethylsiloxane was synthesized via hydroxyl protection, alkylation, anionic ring-opening polymerization, hydrosilylation, and deprotection. Waterborne polyurethane-polysiloxane graft copolymers were prepared by the reaction of poly propylene glycol (PPG), toluene diisocyanate (TDI), 2,2-dimethylol propionic acid (DMPA), 1,4-butanediol (BDO), and α-N,N-dihydroxyethylaminopropyl-ω-butylpolydimethylsiloxane. The water absorption of copolymer films decreased from 163.9 to 17.3% when polysiloxane content increased from 0 to 5%. The tensile strength of the copolymer films increased from 14.0 MPa to 26.3 MPa and decreased when polysiloxane content was more than 3%. The results revealed that the properties of waterborne polyurethane-polysiloxane graft copolymer dispersions and films were improved by grafting polysiloxane chains to polyurethanes.

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Sano, Junta, and Shigeki Habaue. "Multi-Responsive Polysiloxane/Poly(N-isopropylacrylamide) Interpenetrating Networks Containing Urea and Thiourea Groups." Polymers 12, no. 5 (May 20, 2020): 1175. http://dx.doi.org/10.3390/polym12051175.

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Novel interpenetrating polymer networks (IPNs) were synthesized from N-isopropylacrylamide (NIPAM) and polysiloxanes containing a urea or thiourea side group, in addition to the silanol residue, through two reactions, such as the radical gelation of NIPAM and the condensation of silanols to form a siloxane linkage. The obtained IPNs showed a typical temperature-responsive volume change in water based on the constructed poly-NIPAM gel component. In addition, the characteristic color and volume changes responding to chemical stimuli, such as acetate and/or fluoride ions, based on the introduced urea and thiourea groups onto the polysiloxane gel were observed in N,N-dimethylformamide.

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Hirai, Nobumitsu, Masaya Horii, Takeshi Kogo, Akiko Ogawa, Daisuke Kuroda, Hideyuki Kanematsu, Junji Nakata, and Shigeru Katsuyama. "Simple Methods for Evaluating Acid Permeation and Biofilm Formation Behaviors on Polysiloxane Films." Materials 15, no. 6 (March 19, 2022): 2272. http://dx.doi.org/10.3390/ma15062272.

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The sulfuric acid permeation and biofilm formation behaviors of polysiloxane films have been investigated, and simple methods for evaluating the sulfuric acid permeation and biofilm formation behaviors have been proposed in this paper. The polysiloxane films used in these experiments were practically impermeable to the aqueous sulfuric acid solution, and the amount of biofilm formation varied depending on the composition of the films. Further, the amount of sulfuric acid permeation can be estimated by measuring the polarization curves of polysiloxane films with different thicknesses formed on iron electrodes. By measuring the adhesion work of pure water and simulated biofilm droplets on polysiloxane films of different compositions, we can estimate the resistance of biofilm formation on the polysiloxane films.

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Wilson, A. M., G. Zank, K. Eguchi, W. Xing, B. Yates, and J. R. Dahn. "Polysiloxane Pyrolysis." Chemistry of Materials 9, no. 7 (July 1997): 1601–6. http://dx.doi.org/10.1021/cm970002r.

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Stojanovic, Ana, Sandro Olveira, Maria Fischer, and Stefan Seeger. "Polysiloxane Nanotubes." Chemistry of Materials 25, no. 14 (July 3, 2013): 2787–92. http://dx.doi.org/10.1021/cm400851k.

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Zhmurin, P. M., D. A. Yelisieiev, V. D. Alekseev, O. V. Yelisieieva, and Yu O. Нurkalenko. "Alkyl derivative of p-terphenyl as an activator of polysiloxane-based scintillator." Nuclear Physics and Atomic Energy 23, no. 3 (September 25, 2022): 212–16. http://dx.doi.org/10.15407/jnpae2022.03.212.

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One of the problems in creating a radiation-hard scintillation composition on a polysiloxane base is the search for a radiation-hard activator capable of dissolving in such a base in sufficient quantity. In this work, in order to improve the solubility of p-terphenyl molecules in a polysiloxane base, its structure was modified with tert-butyl substituents. The obtained alkyl derivative of p-terphenyl was used as an activator of polysiloxane-based scintillators. The optical and scintillation properties of the obtained polysiloxane-based scintillators were studied, and their radiation hardness was determined.

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Pang, Xiaoyan, Xin Ge, Jianye Ji, Weijie Liang, Ruoling Liu, Xunjun Chen, Guoqiang Yin, and Jianfang Ge. "Improving Oxygen Permeability and Thermostability of Polycarbonate via Copolymerization Modification with Bio-Phenol Polysiloxane." Polymers 11, no. 8 (August 3, 2019): 1302. http://dx.doi.org/10.3390/polym11081302.

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As a new kind of functionalized polysiloxane with chemical reactivity, bio-phenol polysiloxane was synthesized through facile heterogeneous catalytic route. Bio-phenol polysiloxane/polycarbonate (Si/PC) block copolymer was synthesized via a three-step approach, and the effect of the amount of bio-phenol polysiloxane on the properties of Si/PC copolymer was then studied. The structure and morphology of Si/PC copolymer were characterized, showing that, when the amount of bio-phenol polysiloxane reached 20%, the pyrolysis temperature of Si/PC copolymer at 5% weight loss was 450.8 °C which was 76.1 °C higher than pure PC. The oxygen permeability of 20%Si/PC copolymer membrane was 502.65 cm3/m2·24h·0.1MPa, which was increased by 128.4% compared with pure PC membrane. The mechanical property and hydrophobicity of Si/PC copolymer had been improved.

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Zhang, Lanying, Wenhuan Yao, Yanzi Gao, Cuihong Zhang, and Huai Yang. "Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships." Polymers 10, no. 7 (July 19, 2018): 794. http://dx.doi.org/10.3390/polym10070794.

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Organosilicon polymer materials play an important role in certain applications due to characteristics of much lower glass transition temperatures (Tg), viscosities, surface energy, as well as good mechanical, thermal stabilities, and insulation performance stemming from the higher bond energy and the larger bond angles of the adjacent silicon-oxygen bond. This critical review highlights developments in the synthesis, structure, and phase transition behaviors of polysiloxane-based side chain liquid crystal polymers (PSCLCPs) of linear and cyclic polysiloxanes containing homopolymers and copolymers. Detailed synthetic strategies are elaborated, and the relationship between molecular structures and liquid crystalline phase transition behaviors is systematically discussed, providing theoretical guidance on the molecular design of the materials.

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27

Zhang, Meng Meng, Hong Xia Yan, Chao Gong, and Yi Chen Feng. "Hyperbranched Polysiloxane Functionalized Graphene Oxide via Polyhydrosilylation." Applied Mechanics and Materials 464 (November 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.464.3.

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A novel method to functionalize graphene oxide (GO) by hyperbranched polysiloxane via polyhydrosilylation is reported, taking advantage of hyperbranched polysiloxane that possesses good properties such as low viscosity, good rheology, good solubility and high reactivity. The changes in GO surface morphology, chemistry and physical conditions at different stages are characterized by Fourier-transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM). XPS analysis shows that the oxygen content of GO is 29.90% and the silicon content of hyperbranched polysiloxane grafted graphene oxide (HBPGO) is 18.66%. The results indicate that hyperbranched polysiloxane is successfully grafted onto the surface of GO and this novel nanostructure may have potential applications in composites.

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Zhou, Yong Qiang, Cheng Zheng, Yu Zhan, and Dan Na Yin. "The Performance of Polyether Modified Polysiloxane." Advanced Materials Research 554-556 (July 2012): 140–46. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.140.

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According to the corresponding national standard methods, the surface tension, HLB value, CMC value and emulsification performance of the product were determined. Compare the hydrolytic stability with other three kinds of organic silicon surfactants, the experiment result shows that the hydrolytic stability of product is better than the similar products. The key to reduce the hydrolysis rate of polyether modified polysiloxane surfactant is to reduce the contact of polysiloxane chain in surfactant molecules with water solution. For methoxy-terminated polyether modified polysiloxane, the methyl ether open as the umbrella, which can reduce the contact of polysiloxane chain in surfactant molecules and water solution to a certain extent, so the hydrolysis stability raise.

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Xu, Jin Yun, and Shan Shan Han. "The Polyetherification Modified Reaction on Silicone Oil." Advanced Materials Research 560-561 (August 2012): 667–71. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.667.

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Nowadays, polyether silicone oil is widely used in many aspects of chemical industry. In this paper, the synthesis of polyether modified polysiloxane was studied and its technology was the best choice. This paper discussed the synthesis of polyether modified polysiloxane materials during the synthesis ratio, catalyst amount, reaction time and temperature on the synthesis of polyether polysiloxane low conversion rate of hydrogen silicone oil. The results showed that synthesis of polyether modified polysiloxane of the best technology: the C=C of allyl alcohol and the Si-H in low-hydrogen silicone polyether feed ratio was 1:1.2, the catalyst material is 33 μg / g, the reaction temperature is 110 °C, reaction time to 8 h.

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30

Yahya, Sufiah Mohamad, A. Azmi, Sufizar Ahmad, and Hariati Taib. "Characterisation of Hand-Cast Polysiloxane-Silica Sheet Composite." Advanced Materials Research 893 (February 2014): 250–53. http://dx.doi.org/10.4028/www.scientific.net/amr.893.250.

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The study investigates the effects of various contents of rice husk silica (RHS) on mechanical properties of polysiloxane (POS) sheet composite. The polysiloxane sheet composites filled with 5wt%, 10wt%, 15wt% and 20wt% of RHS were fabricated using casting technique at room temperature. The polysiloxane sheet reinforced RHS (POS-RHS) composites were characterised using thermogravimetry analysis (TGA), Fourier Transformation Infrared Spectroscopy (FTIR) and tensile test to determine the thermal and mechanical properties. It was found that the RHS as filler in polysiloxane is improvement in mechanical properties and the curve degradation of POS and POS-RHS are similarly. By using FTIR was shown the affect of Si and O bonding from RHS as filler.

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31

Prisacaru, Anca-Irina, Silvia Grama, Ana Durdureanu-Angheluta, Mariana Pinteala, and Nicolae Hurduc. "Azo-polysiloxane micelles charged with nifedipine." Open Chemistry 11, no. 9 (September 1, 2013): 1431–38. http://dx.doi.org/10.2478/s11532-013-0279-3.

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AbstractAbstract One recent aspect of the research study on polymers is their capability to respond to external stimuli. Of importance are photosensitive polymers due to their application in drug delivery systems, sensors, therapeutic devices or optoelectronic switches. The present paper focuses on the azo-polysiloxane micelles capacity charged with hydrophobic drugs, such as nifedipine. Azo-polysiloxanes modified with quaternary ammonium groups and which are capable to generate photo-sensitive micelles were synthesized and characterized by 1H-NMR, UV-VIS and fluorescence spectroscopy. The critical concentration of the micellar aggregation (CCA) was evaluated as was the nifedipine embedding capacity. The CCA values were influenced only by the hydrophobic/hydrophilic balance and not by the chemical structure of the quaternary ammonium groups. The disaggregation capacity of the micelles under UV irradiation was investigated as well, and the best results were obtained for the samples with higher azobenzene content. The DLS measurements evidenced micelles diameters situated in the optimum range domain (70–130 nm). The capacity to incorporate nifedipine inside the micelles was demonstrated. The micelles proved to be stable in time, 21 days after preparation with the diameter having constant values. Graphical abstract

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32

Qu, Mengnan, Jinmei He, Sun Zhe, Kanshe Li, Xiangrong Liu, and Chunxia Yu. "Fabrication of Mechanical Durable Polysiloxane Superhydrophobic Materials." Journal of Nanomaterials 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/284685.

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A mechanical durable polysiloxane superhydrophobic surface was successfully prepared by means of polymerization of silanes blending with particles. The as-prepared polysiloxane surface showed stable superhydrophobicity even after the surface underwent a long distance friction. The superhydrophobicity of the polysiloxane materials can be even slightly enhanced by the surface abrasion. The scanning electron microscopy demonstrated that the micro- and nanometer structures distributed through the whole materials thickness are responsible for the mechanical durable superhydrophobicity.

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33

Li, Yan, Qingsong Lian, Zhengrong Lin, Jue Cheng, and Junying Zhang. "Epoxy/polysiloxane intimate intermixing networks driven by intrinsic motive force to achieve ultralow-temperature damping properties." Journal of Materials Chemistry A 5, no. 33 (2017): 17549–62. http://dx.doi.org/10.1039/c7ta04894g.

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34

Wang, Meng, Jun Xing, Yu-Tang Sun, Ling-Xiang Guo, Bao-Ping Lin, and Hong Yang. "Thiol–ene photoimmobilization of chymotrypsin on polysiloxane gels for enzymatic peptide synthesis." RSC Advances 8, no. 22 (2018): 11843–49. http://dx.doi.org/10.1039/c7ra13320k.

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Here we report a strategy to photoimmobilize chymotrypsin onto polysiloxane gels via thiol-ene click chemistry. The polysiloxane-immobilized chymotrypsin shows enhanced catalytic activity, thermal stability and recyclability.

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35

Mahzan, Shahruddin, Mohd Azham Azmi, Hariati Taib, and Nurul Emi Nur Ain Mohammad. "Vibration Exposure Analysis of the Polysiloxane Reinforced with Rice Husk Silica." Applied Mechanics and Materials 660 (October 2014): 531–35. http://dx.doi.org/10.4028/www.scientific.net/amm.660.531.

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One of approaches to protect devices from unpleasant vibrating disturbances is by employing a vibration absorber. This paper explores the viability of polysiloxane as raw material, added with rice husk silica fillers to produce a vibration absorbent sheet. The polysiloxane reinforced with rice husk sheets were made using hot compression moulding technique. The samples were tested for its density and tensile tests according to related standards. As for vibration test, a portable hand grinder was used to estimate the vibration exposure experienced by the users. The polysiloxane sheets were strapped on the tool’s handle and the vibration exposure was measured. The result shows that by applying the polysiloxane sheets on the tool grinder reduces the vibration magnitude by a maximum value of 38 percents. The longest vibration time exposure was recorded for 6.42 hours, improved by 150 percents from the original vibration time exposure of 2.52 hours. The results also demonstrated that polysiloxane with 4 wt. % rice husk silica was the optimum combination for vibration application since it produced highest vibration magnitude reduction and longest vibration exposure time of grinder applications.

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36

Xu, Tian Heng, Qing Song Ma, and Zhao Hui Chen. "Fabrication and Properties of Cf/SiC Composites Derived from Polysiloxane Precursor." Materials Science Forum 686 (June 2011): 419–22. http://dx.doi.org/10.4028/www.scientific.net/msf.686.419.

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Carbon fiber reinforced silicon carbide composites (Cf/SiC) were derived through precursor infiltration pyrolysis route (PIP) at 1600°C in vacuum atmosphere using polysiloxane as precursor. The matrix of Cf/SiC was characterized by X-ray diffraction and elemental analysis. The results show that crystalline β-SiC can be derived at 1600°C in vacuum from polysiloxane. The flexural strength and fracture toughness of polysiloxane derived from Cf/SiC can reach up to 70 MPa and 2.3MPa·m respectively1/2.

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37

Cui, Yue Zhi, Xiao Liang Ren, Xue Ming Dong, and Yong Tao Wang. "Fluorescent Sensors for Nitroaromatic Compounds Based on the Comb-Like Polysiloxane-Acrylate." Advanced Materials Research 306-307 (August 2011): 1640–44. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1640.

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A functional polysiloxane monomer, with a double bond and a fluorophore pyrene at each end of the polysiloxane chain, respectively, was synthesized. Copolymerize this functional monomer with other acrylates in emulsion, we got a comb-like polymer in which pyrene fluorophore is at the end of each polysiloxane side-chain. This polymer shows great advantage in sensing performance for 2,4-dinitrotoluene (DNT) over its analog that was prepared just by mixing pyrene with pure polyacrate emulsion.

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38

Yin, Yin, Li Chao Dong, Na Jin, Yan Guan, Jun Ge Zhi, and Wen Sheng Deng. "Synthesis and Aggregation-Induced Emission Feature of Series of Polysiloxanes Containing Triphenylpyrrole Side-Chain." Key Engineering Materials 842 (May 2020): 47–52. http://dx.doi.org/10.4028/www.scientific.net/kem.842.47.

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A series of aggregation-induced emission (AIE) active polysiloxanes (P7-1~P7-2, P29-1~P29-6) were prepared through hydrosilylation between polymethylhydrosiloxane (PMHS, DP=7 or 29) and AIE-active vinyl monomer 1-(4'-allyloxy-biphenyl)-2,5-diphenyl pyrrole (M-TPP), or with optical active monomer cholesteryl allyloxy ether (M-Chol*). Monomer M-TPP and all of the polymers exhibits aggeragation-induced emission enhancement properties. The fluorescence intensity of M-TPP in THF/H2O mixtures increases when the water fraction is higher than 60%, while is over 20% for polysiloxanes, which mainly because the entanglement of the flexible polysiloxane main-chain can restrict the molecular motion of triphenylpyrrole (TPP) derivates and induce the increasing of the fluorescence intensity. Moreover, the maximum relative fluorescence intensity (I/I0) is equal to 4 for M-TPP and 1.4~4.9 for polysiloxanes, and the grafted degree of the TPP derivative has effect on the AIE properties of polymers. The specific optical rotations of the chiral polymers increase with increasing the content of chiral cholesteryl ether moieties. All the target polymers possess good thermal stabilities and their decomposition points (Td) are greater than 320°C.

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39

Wells, Lisa A., P. E. Cassidy, T. M. Aminabhavi, and R. B. Perry. "A Study of Permeation and Diffusion of Aqueous Salt Solutions through Polyurethane and Polysiloxane and Their Laminates." Rubber Chemistry and Technology 63, no. 1 (March 1, 1990): 66–76. http://dx.doi.org/10.5254/1.3538243.

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Abstract Effect of ion size on water permeation through polyurethane, polysiloxane, and their laminates has been studied. The results of these studies for the polyurethane membranes correlated well with the reported values of water permeation through a variety of other polyurethane elastomers. Permeation rates and the Arrhenius relationship of polyurethane and polysiloxane membranes were found to be similar. Solute size showed no observable effect on water permeation through polyurethane, polysiloxane, or their bilayer laminates, within experimental error. A small effect of solute size was observed for diffusion of water into polyurethane. Permeation rates of the bilayer laminates demonstrated a small directional dependence or “valving” effect. In the light of this evidence, it may be suggested that highly permeable systems, such as polyurethane and polysiloxane, are relatively insensitive to permeant composition.

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Sun, Dianming, Zhaomin Yang, Xiaoli Sun, Huihui Li, Zhongjie Ren, Junteng Liu, Dongge Ma, and Shouke Yan. "Synthesis of triphenylamine based polysiloxane as a blue phosphorescent host." Polym. Chem. 5, no. 17 (2014): 5046–52. http://dx.doi.org/10.1039/c4py00450g.

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Triphenylamine based polysiloxane has been successfully synthesized as a phosphorescent host. This work demonstrates that modifying triphenylamine by polysiloxane is a promising approach to improve its physical properties while maintaining its electronic properties.

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41

Hu, Jingang, Yuming Zhou, and Xiaoli Sheng. "Hydrothermal synthesis of ZnO@polysiloxane microspheres and their application in preparing optical diffusers." RSC Advances 5, no. 22 (2015): 17064–69. http://dx.doi.org/10.1039/c4ra12217h.

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ZnO@polysiloxane hybrid microspheres were successfully prepared by a simple one-pot synthesis. The novel diffuser based on ZnO@polysiloxane fillers possessed suitable light transmittance, good diffusion capacity, and low incident angle dependence.

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42

He, Xinxin, Xue Han, Huan Wang, Bing Wang, and Bo Wu. "Polysiloxanes-based stationary phases containing methoxy-substituted tetraphenyl–phenyl groups for gas chromotographic separations." RSC Advances 6, no. 80 (2016): 76514–23. http://dx.doi.org/10.1039/c6ra19537g.

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3,4-Di(4-methoxy phenyl)-2,5-diphenyl phenyl grafted polysiloxane (MTP) and 3,4-di(3,4,5-trimethoxy phenyl)-2,5-diphenyl phenyl grafted polysiloxane (TMP) were synthesized and statically coated on fused silica capillary columns.

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43

Yolsal, Utku, and Lian R. Hutchings. "Synthesis and coupling of ABx polysiloxane macromonomers to form highly branched polysiloxanes." European Polymer Journal 113 (April 2019): 254–59. http://dx.doi.org/10.1016/j.eurpolymj.2019.01.066.

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44

Loos, Katja, Gerd Jonas, and Reimund Stadler. "Carbohydrate Modified Polysiloxanes, 3. Solution Properties of Carbohydrate-Polysiloxane Conjugates in Toluene." Macromolecular Chemistry and Physics 202, no. 16 (November 1, 2001): 3210–18. http://dx.doi.org/10.1002/1521-3935(20011101)202:16<3210::aid-macp3210>3.0.co;2-2.

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45

Wheat, Neil. "New polysiloxane hybrids." Metal Finishing 103, no. 6 (June 2005): 46–50. http://dx.doi.org/10.1016/s0026-0576(05)80080-7.

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46

Miller, L. S., A. L. Rhoden, N. Byrne, J. Heptinstall, and D. J. Walton. "Polysiloxane-based biomembranes." Materials Science and Engineering: C 3, no. 3-4 (December 1995): 187–90. http://dx.doi.org/10.1016/0928-4931(95)00067-4.

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47

Kraus, Günter, Angelika Kraus, Bernd Krücke, and Horst Zaschke. "Retentionsverhalten mesogener Polysiloxane." Zeitschrift für Chemie 26, no. 2 (August 31, 2010): 66–67. http://dx.doi.org/10.1002/zfch.19860260209.

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48

Stiubianu, George, Maria Cazacu, Mariana Cristea, and Angelica Vlad. "Polysiloxane-lignin composites." Journal of Applied Polymer Science 113, no. 4 (August 15, 2009): 2313–21. http://dx.doi.org/10.1002/app.30240.

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49

Zhang, Cai Yun, and Xing Hua Zhang. "Study on Synthesis of Polyether-Modified Polysiloxane." Advanced Materials Research 1004-1005 (August 2014): 277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.277.

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Polyether-modified polysiloxane was synthesized by hydrosilylation, using allylic alcohol polyether and polysiloxane as materials, toluene as solvent and chloroplatinic as catalyst. The effect of technology conditions on conversion rate of hydrogenous silicone oil was discussed and chemical structure of product was characterized. The results show that the optimum technology is: the reaction temperature is 95°C, time is 5h, the molar ratio of polysiloxane to polyether is 1:1.2, the dosage of catalyst is 30ug/g and the mass fraction of the toluene is 25% of the system.

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Han, Xue, Xinxin He, Bing Wang, and Bo Wu. "Polarizable polysiloxane stationary phase containing a cyano unit attached to an aromatic side group for highly selective separation of H-bonding and aromatic analytes." RSC Advances 6, no. 111 (2016): 109786–92. http://dx.doi.org/10.1039/c6ra20397c.

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A new polarizable polysiloxane stationary phase containing a cyano unit attached to an aromatic side group, called CPPP [14.6% 3,4-bis(4-cyanophenyl)-2,5-diphenyl phenyl polysiloxane], was synthesized and used as a stationary phase for capillary gas chromatography (GC).

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Journal articles on the topic 'Polysiloxane'

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