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Artículos de revistas sobre el tema "POSS"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 10 de marzo de 2023

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1

Shockey, Edward G., Alan G. Bolf, Paul F. Jones, Joseph J. Schwab, Kevin P. Chaffee, Timothy S. Haddad y Joseph D. Lichtenhan. "Functionalized polyhedral oligosilsesquioxane (POSS) macromers: new graftable POSS hydride, POSS α-olefin, POSS epoxy, and POSS chlorosilane macromers and POSS-siloxane triblocks". Applied Organometallic Chemistry 13, n.º 4 (abril de 1999): 311–27. http://dx.doi.org/10.1002/(sici)1099-0739(199904)13:4<311::aid-aoc847>3.0.co;2-1.

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2

Su, Tao, Weiwei Men, Zhiqiang Wang, Lixin Xuan y Weiwei Zhao. "POSS-benzocyclobutene (POSS-BCB) resin". High Performance Polymers 30, n.º 9 (27 de noviembre de 2017): 1123–29. http://dx.doi.org/10.1177/0954008317740194.

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Organic-inorganic hybrid materials with a high thermal stability and a low dielectric constant show great potential in the microelectronics industry. In this work, polyhedral oligomeric silsesquioxane-benzocyclobutenes (POSS-BCBs) were synthesized by a hydrosilylation reaction of octavinyloctasilasesquioxane (OVPOSS) and 4-(1,1-dimethyl-1-hydro)-silyl-benzocyclobutene with H2PtCl6 as a catalyst. The ring-opening reaction of BCB on POSS-BCBs resulted in POSS-BCB resins with a highly cross-linked network structure. This resin exhibited good thermal stability (T5% is 495°C in N2), low dielectric constants (<2.1 at 20 MHz) and low water absorption.

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3

Shockey, Edward G., Alan G. Bolf, Paul F. Jones, Joseph J. Schwab, Kevin P. Chaffee, Timothy S. Haddad y Joseph D. Lichtenhan. "ChemInform Abstract: Functionalized Polyhedral Oligosilsesquioxane (POSS) Macromers: New Graftable POSS Hydride, POSS α-Olefin, POSS Epoxy, and POSS Chlorosilane Macromers and POSS-Siloxane Triblocks." ChemInform 30, n.º 32 (14 de junio de 2010): no. http://dx.doi.org/10.1002/chin.199932182.

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4

Qian, Chao, Chao Bian y Chao Feng. "Subset Selection by Pareto Optimization with Recombination". Proceedings of the AAAI Conference on Artificial Intelligence 34, n.º 03 (3 de abril de 2020): 2408–15. http://dx.doi.org/10.1609/aaai.v34i03.5621.

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Subset selection, i.e., to select a limited number of items optimizing some given objective function, is a fundamental problem with various applications such as unsupervised feature selection and sparse regression. By employing a multi-objective evolutionary algorithm (EA) with mutation only to optimize the given objective function and minimize the number of selected items simultaneously, the recently proposed POSS algorithm achieves state-of-the-art performance for subset selection. In this paper, we propose the PORSS algorithm by incorporating recombination, a characterizing feature of EAs, into POSS. We prove that PORSS can achieve the optimal polynomial-time approximation guarantee as POSS when the objective function is monotone, and can find an optimal solution efficiently in some cases whereas POSS cannot. Extensive experiments on unsupervised feature selection and sparse regression show the superiority of PORSS over POSS. Our analysis also theoretically discloses that recombination from diverse solutions can be more likely than mutation alone to generate various variations, thereby leading to better exploration; this may be of independent interest for understanding the influence of recombination.

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5

Wheeler, Paul A., Bruce X. Fu, Joseph D. Lichtenhan, Jia Weitao y Lon J. Mathias. "Incorporation of metallic POSS, POSS copolymers, and new functionalized POSS compounds into commercial dental resins". Journal of Applied Polymer Science 102, n.º 3 (2006): 2856–62. http://dx.doi.org/10.1002/app.24645.

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6

Gamal Mohamed, Mohamed, Mei-Yin Tsai, Chih-Feng Wang, Chih-Feng Huang, Martin Danko, Lizong Dai, Tao Chen y Shiao-Wei Kuo. "Multifunctional Polyhedral Oligomeric Silsesquioxane (POSS) Based Hybrid Porous Materials for CO2 Uptake and Iodine Adsorption". Polymers 13, n.º 2 (10 de enero de 2021): 221. http://dx.doi.org/10.3390/polym13020221.

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In this study, two different types of hybrid porous organic polymers (POPs), polyhedral oligomeric silsesquioxane tetraphenylpyrazine (POSS-TPP) and tetraphenylethene (POSS-TPE), were successfully synthesized through the Friedel−Crafts polymerization of tetraphenylpyrazine (TPP) and tetraphenylethene (TPE), respectively, with octavinylsilsesquioxane (OVS) as node building blocks, in the presence of anhydrous FeCl3 as a catalyst and 1,2-dichloroethane at 60 °C. Based on N2 adsorption and thermogravimetric analyses, the resulting hybrid porous materials displayed high surface areas (270 m2/g for POSS-TPP and 741 m2/g for POSS-TPE) and outstanding thermal stabilities. Furthermore, as-prepared POSS-TPP exhibited a high carbon dioxide capacity (1.63 mmol/g at 298 K and 2.88 mmol/g at 273 K) with an excellent high adsorption capacity for iodine, reaching up to 363 mg/g, compared with the POSS-TPE (309 mg/g).

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7

Gamal Mohamed, Mohamed, Mei-Yin Tsai, Chih-Feng Wang, Chih-Feng Huang, Martin Danko, Lizong Dai, Tao Chen y Shiao-Wei Kuo. "Multifunctional Polyhedral Oligomeric Silsesquioxane (POSS) Based Hybrid Porous Materials for CO2 Uptake and Iodine Adsorption". Polymers 13, n.º 2 (10 de enero de 2021): 221. http://dx.doi.org/10.3390/polym13020221.

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In this study, two different types of hybrid porous organic polymers (POPs), polyhedral oligomeric silsesquioxane tetraphenylpyrazine (POSS-TPP) and tetraphenylethene (POSS-TPE), were successfully synthesized through the Friedel−Crafts polymerization of tetraphenylpyrazine (TPP) and tetraphenylethene (TPE), respectively, with octavinylsilsesquioxane (OVS) as node building blocks, in the presence of anhydrous FeCl3 as a catalyst and 1,2-dichloroethane at 60 °C. Based on N2 adsorption and thermogravimetric analyses, the resulting hybrid porous materials displayed high surface areas (270 m2/g for POSS-TPP and 741 m2/g for POSS-TPE) and outstanding thermal stabilities. Furthermore, as-prepared POSS-TPP exhibited a high carbon dioxide capacity (1.63 mmol/g at 298 K and 2.88 mmol/g at 273 K) with an excellent high adsorption capacity for iodine, reaching up to 363 mg/g, compared with the POSS-TPE (309 mg/g).

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8

Lichtenhan, Pielichowski y Blanco. "POSS-Based Polymers". Polymers 11, n.º 10 (22 de octubre de 2019): 1727. http://dx.doi.org/10.3390/polym11101727.

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The combination of functional polymers with inorganic nanostructured compounds has become a major area of research and technological development owing to the remarkable properties and multifunctionalities deriving from their nano and hybrid structures [...]

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9

Tanaka, Kazuo, Fumiyasu Ishiguro y Yoshiki Chujo. "POSS Ionic Liquid". Journal of the American Chemical Society 132, n.º 50 (22 de diciembre de 2010): 17649–51. http://dx.doi.org/10.1021/ja105631j.

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10

Chinnam, Parameswara Rao, Michael R. Gau, Joseph Schwab, Michael J. Zdilla y Stephanie L. Wunder. "The polyoctahedral silsesquioxane (POSS) 1,3,5,7,9,11,13,15-octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane (octaphenyl-POSS)". Acta Crystallographica Section C Structural Chemistry 70, n.º 10 (28 de septiembre de 2014): 971–74. http://dx.doi.org/10.1107/s2053229614019834.

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Solvent-free single crystals of 1,3,5,7,9,11,13,15-octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane (abbreviated as octaphenyl-POSS), C48H40O12Si8, were obtained by dehydration/condensation of the tetrol Si4O4(Ph)4(OH)4. The powder pattern generated from the single-crystal data matches well with the experimentally measured powder pattern of commercial octaphenyl-POSS. The geometry of the centrosymmetric molecule in the crystal was compared with that in the gas phase, and had shorter Si—O bond lengths and a broader range of Si—O—Si bond angles. The average Si—O bond length [1.621 (3) Å], and Si—O—Si and O—Si—O bond angles [149 (5) and 109 (1)°, respectively] were within the same range measured previously for octaphenyl-POSS solvates.

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11

Matějka, Libor, Piotr Murias y Josef Pleštil. "Effect of POSS on thermomechanical properties of epoxy–POSS nanocomposites". European Polymer Journal 48, n.º 2 (febrero de 2012): 260–74. http://dx.doi.org/10.1016/j.eurpolymj.2011.11.009.

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12

Majumdar, Partha, Elizabeth Lee, Nathan Gubbins, Shane J. Stafslien, Justin Daniels, Clayton J. Thorson y Bret J. Chisholm. "Synthesis and antimicrobial activity of quaternary ammonium-functionalized POSS (Q-POSS) and polysiloxane coatings containing Q-POSS". Polymer 50, n.º 5 (febrero de 2009): 1124–33. http://dx.doi.org/10.1016/j.polymer.2009.01.009.

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13

Cobos, Mónica, Johnny R. Ramos, Dailyn J. Guzmán, M. Dolores Fernández y M. Jesús Fernández. "PCL/POSS Nanocomposites: Effect of POSS Derivative and Preparation Method on Morphology and Properties". Polymers 11, n.º 1 (26 de diciembre de 2018): 33. http://dx.doi.org/10.3390/polym11010033.

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The incorporation of polyhedral oligomeric silsesquioxanes (POSS) molecules as nanoparticles into polymers can provide improved physico-chemical properties. The enhancement depends on the extent of dispersion of the nanofiller, which is determined by the compatibility with the polymer that is by the POSS type, and the processing method. In this study, poly(ε-caprolactone)/POSS derivatives nanocomposites (PCL/POSS) were obtained via solution-casting and melt compounding. Two amino-derivatives containing different alkyl substituents, and ditelechelic POSS-containing hybrid PCL masterbatch were used as nanofillers. The effect of preparation method, POSS content and type on the morphology, thermal, mechanical, and surface properties of nanocomposites were studied. Morphological analysis evidenced the formation of POSS crystalline aggregates, self-assembled POSS molecules of submicrometer size dispersed in the polymer matrix. The best dispersion was achieved using the ditelechelic POSS-containing hybrid PCL masterbatch, and comparing the two amino-POSS derivatives, the one with longer alkyl chain of substituents exhibited better degree of dispersion independent of preparation method. DSC analysis showed the role of POSS derivatives as nucleating agents for PCL. The incorporation of POSS derivatives into the PCL matrix improved thermal stability. The preparation method, POSS type and content had influence on mechanical properties of nanocomposites. POSS nanoparticles enhanced the surface hydrophobicity of PCL.

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14

Mantz, R. A., P. F. Jones, K. P. Chaffee, J. D. Lichtenhan, J. W. Gilman, I. M. K. Ismail y M. J. Burmeister. "Thermolysis of Polyhedral Oligomeric Silsesquioxane (POSS) Macromers and POSS−Siloxane Copolymers". Chemistry of Materials 8, n.º 6 (enero de 1996): 1250–59. http://dx.doi.org/10.1021/cm950536x.

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15

Zhou, Sheng Zhi, Xiao Yan Song y Bo Wen Cheng. "Influence of POSS Content on the Thermal Properties of PAN/POSS Nanofibers". Applied Mechanics and Materials 423-426 (septiembre de 2013): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.3.

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PAN/POSS nanofibers membrane with different content POSS have been prepared by electrospinning. The morphology and thermal properties of PAN/POSS nanofibers are characterized by SEM and DSC, respectively. The addition of different content of POSS into PAN matrix have a slight effect on the diameter of nanofibers. Compared to pure PAN fibers, the exothermic peak shift to higher temperatures by 6.8°C when POSS loading is 3wt%, and the corresponding Tg have increased 17.3°C.

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16

Calabrese, Carla, Carmela Aprile, Michelangelo Gruttadauria y Francesco Giacalone. "POSS nanostructures in catalysis". Catalysis Science & Technology 10, n.º 22 (2020): 7415–47. http://dx.doi.org/10.1039/d0cy01407a.

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17

Tanaka, Kazuo, Fumiyasu Ishiguro, Jong-Hwan Jeon, Tatsuhiro Hiraoka y Yoshiki Chujo. "POSS ionic liquid crystals". NPG Asia Materials 7, n.º 4 (abril de 2015): e174-e174. http://dx.doi.org/10.1038/am.2015.28.

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18

Kuo, Shiao-Wei y Feng-Chih Chang. "POSS related polymer nanocomposites". Progress in Polymer Science 36, n.º 12 (diciembre de 2011): 1649–96. http://dx.doi.org/10.1016/j.progpolymsci.2011.05.002.

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19

Sun, Junshan, Yanli Chen, Luyang Zhao, Yuting Chen, Dongdong Qi, Kyung-Min Choi, Dong-Soo Shin y Jianzhuang Jiang. "Porphyrin-POSS Molecular Hybrids". Chemistry - A European Journal 19, n.º 38 (26 de agosto de 2013): 12613–18. http://dx.doi.org/10.1002/chem.201301875.

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20

Xin, Cunliang, Xiaoyan Ma, Fang Chen, Chunying Song y Xiaohong Qu. "Synthesis of EP-POSS mixture and the properties of EP-POSS/epoxy, SiO2/epoxy, and SiO2/EP-POSS/epoxy nanocomposite". Journal of Applied Polymer Science 130, n.º 2 (5 de abril de 2013): 810–19. http://dx.doi.org/10.1002/app.39203.

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21

Wang, Bing, Minxian Shi, Jie Ding y Zhixiong Huang. "Polyhedral oligomeric silsesquioxane (POSS)-modified phenolic resin: Synthesis and anti-oxidation properties". e-Polymers 21, n.º 1 (1 de enero de 2021): 316–26. http://dx.doi.org/10.1515/epoly-2021-0031.

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Abstract In this work, octamercapto polyhedral oligomeric silsesquioxane (POSS-8SH) and octaphenol polyhedral oligomeric silsesquioxane (POSS-8Phenol) were successfully synthetized. POSS-8Phenol was added into the synthesis process of liquid thermoset phenolic resin (PR) to obtain POSS-modified phenolic resin (POSS-PR). Chemical structures of POSS-8SH, POSS-8Phenol, and POSS-PR were confirmed by FTIR and 1H-NMR. TG and DTG analysis under different atmosphere showed that char yield of POSS-PR at 1,000°C increased from 58.6% to 65.2% in N2, which in air increased from 2.3% to 26.9% at 700°C. The maximum pyrolysis temperature in air increased from 543°C to 680°C, which meant better anti-oxidation properties. XRD results confirmed both POSS-8Phenol and POSS-PR-generated crystalline SiO2 in air, which could explain the improvement of anti-oxidation properties. SEM showed that the POSS-PR had phase separation during curing process. Finally, carbon fiber fabric-reinforced POSS-PR (C-POSS-PR) was prepared to verify the anti-oxidation properties of POSS-PR.

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22

Lipińska, Magdalena. "The Effect of Various Polyhedral Oligomeric Silsesquioxanes on Viscoelastic, Thermal Properties and Crystallization of Poly(ε-caprolactone) Nanocomposites". Polymers 14, n.º 23 (23 de noviembre de 2022): 5078. http://dx.doi.org/10.3390/polym14235078.

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Polyhedral oligomeric silsesquioxane POSS nanoparticles can be applied as reinforcing additives modifying various properties of biodegradable polymers. The effects of aminopropylisobutyl POSS (amine-POSS), trisilanolisooctyl-POSS (HO-POSS) and glycidyl-POSS (Gly-POSS) on the viscoelastic, thermal properties and crystallization of biodegradable poly(ε-caprolactone) PCL were studied. The analysis of the viscoelastic properties at ambient temperature indicated that aminopropylisobutyl POSS (amine-POSS) and glycidyl-POSS (Gly-POSS) enhanced the dynamic mechanical properties of PCL. The increase in the storage shear modulus G′ and loss modulus G″ was observed. The plasticizing effect of trisilanolisooctyl POSS (HO-POSS) due to the presence of long isoctyl groups was confirmed. As a result, the crystallization of PCL was facilitated and the degree of crystallinity of χc increased up to 50.9%. The damping properties and the values of tan δ for PCL/HO-POSS composition increased from 0.052 to 0.069. The TGA results point out the worsening of the PCL thermal stability, with lower values of T0.5%, T1% and T3%. Both HO-POSS and Gly-POSS facilitated the relaxation of molten PCL. The presence of Gly-POSS influenced the changes that occurred in the viscoelastic properties of the molten PCL due to the thermo-mechanical degradation of the material; a positive impact was observed.

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23

Bram, Avraham I., Irina Gouzman, Asaf Bolker, Nurit Atar, Noam Eliaz y Ronen Verker. "Influence of POSS Type on the Space Environment Durability of Epoxy-POSS Nanocomposites". Nanomaterials 12, n.º 2 (14 de enero de 2022): 257. http://dx.doi.org/10.3390/nano12020257.

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In order to use polymers at low Earth orbit (LEO) environment, they must be protected against atomic oxygen (AO) erosion. A promising protection strategy is to incorporate polyhedral oligomeric silsesquioxane (POSS) molecules into the polymer backbone. In this study, the space durability of epoxy-POSS (EPOSS) nanocomposites was investigated. Two types of POSS molecules were incorporated separately—amine-based and epoxy-based. The outgassing properties of the EPOSS, in terms of total mass loss, collected volatile condensable material, and water vapor regain were measured as a function of POSS type and content. The AO durability was studied using a ground-based AO simulation system. Surface compositions of EPOSS were studied using high-resolution scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that with respect to the outgassing properties, only some of the EPOSS compositions were suitable for the ultrahigh vacuum space environment, and that the POSS type and content had a strong effect on their outgassing properties. Regardless of the POSS type being used, the AO durability improved significantly. This improvement is attributed to the formation of a self-passivated AO durable SiO2 layer, and demonstrates the potential use of EPOSS as a qualified nanocomposite for space applications.

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24

Raus, Vladimír, Eva Čadová, Larisa Starovoytova y Miroslav Janata. "ATRP of POSS Monomers Revisited: Toward High-Molecular Weight Methacrylate–POSS (Co)Polymers". Macromolecules 47, n.º 21 (23 de octubre de 2014): 7311–20. http://dx.doi.org/10.1021/ma501541g.

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25

Gu, S. Y. y X. F. Gao. "Improved shape memory performance of star-shaped POSS-polylactide based polyurethanes (POSS-PLAUs)". RSC Advances 5, n.º 109 (2015): 90209–16. http://dx.doi.org/10.1039/c5ra14742e.

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26

Kodal, Mehmet. "Polypropylene/polyamide 6/POSS ternary nanocomposites: Effects of POSS nanoparticles on the compatibility". Polymer 105 (noviembre de 2016): 43–50. http://dx.doi.org/10.1016/j.polymer.2016.10.021.

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27

Zhao, Huipeng, Jie Shu, Qun Chen y Shanmin Zhang. "Quantitative structural characterization of POSS and octavinyl-POSS nanocomposites by solid state NMR". Solid State Nuclear Magnetic Resonance 43-44 (mayo de 2012): 56–61. http://dx.doi.org/10.1016/j.ssnmr.2012.02.005.

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28

Chinnam, Parameswara Rao y Stephanie L. Wunder. "Polyoctahedral Silsesquioxane-Nanoparticle Electrolytes for Lithium Batteries: POSS-Lithium Salts and POSS-PEGs". Chemistry of Materials 23, n.º 23 (13 de diciembre de 2011): 5111–21. http://dx.doi.org/10.1021/cm2015675.

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29

Xu, Yiting, Cong Li, Min Chen, Jianjie Xie, Ying Cao, Yuanming Deng, Conghui Yuan y Lizong Dai. "The effect of POSS-based block copolymer as compatibilizer on POSS/epoxy composites". Journal of Materials Research 30, n.º 2 (28 de enero de 2015): 266–77. http://dx.doi.org/10.1557/jmr.2014.364.

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30

Wang, Yen-Zen, Huang-Shian Tsai, Zhao-Yu Ji y Wen-Yi Chen. "Controlling POSS dispersion in epoxy in nanocomposite by introducing multi-epoxy POSS groups". Journal of Materials Science 42, n.º 17 (19 de junio de 2007): 7611–16. http://dx.doi.org/10.1007/s10853-007-1845-x.

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31

Sirin, Humeyra, Dilek Turan, Guralp Ozkoc y Sezen Gurdag. "POSS reinforced PET based composite fibers: “Effect of POSS type and loading level”". Composites Part B: Engineering 53 (octubre de 2013): 395–403. http://dx.doi.org/10.1016/j.compositesb.2013.05.033.

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32

Misra, Rahul, Bruce X. Fu, Andreas Plagge y Sarah E. Morgan. "POSS-nylon 6 nanocomposites: Influence of POSS structure on surface and bulk properties". Journal of Polymer Science Part B: Polymer Physics 47, n.º 11 (1 de junio de 2009): 1088–102. http://dx.doi.org/10.1002/polb.21714.

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33

Gao, Jin, Sihua Guo, Jiaquan Liu y Jiao Li. "Properties of Polyhedral Oligomeric Silsesquioxane-Modified Cellulose Insulation Paper with Different Number of Phenyls". International Journal of Heat and Technology 39, n.º 2 (30 de abril de 2021): 383–89. http://dx.doi.org/10.18280/ijht.390207.

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Polyhedral oligomeric silsesquioxane (POSS) has a total of eight substituents. The number of substituents determines the modification effect of POSS. Through simulation of molecular dynamics, this paper explores how the number of substituents affects the POSS-modified cellulose insulation paper. Specifically, the mechanical properties, thermal stability and polarizability were calculated for cellulose models with 1-phenyl POSS, 2-phenyl POSS, 3-phenyl POSS, 4-phenyl POSS, 5-phenyl POSS, 6-phenyl POSS, 7-phenyl POSS, and 8-phenyl POSS, respectively. The results show that the cellulose model modified by 6-phenyl POSS achieved better effect than the other seven models, as evidenced by its distinctively large bulk modulus, shear modulus, and elastic modulus. Besides, the cellulose model modified by 6-phenyl POSS had the most stable and the minimum mean square displacement (MSD). This is because the mechanical properties of the insulation paper are improved, as the motion of cellulose chains is inhibited by the nano-size effect of POSS and the effect of phenyls. Further, the cellulose model modified by 6-phenyl POSS also had the smallest polarizability among the modified models. Therefore, the 6-phenyl POSS-modified cellulose model can effectively reduce the polarizability of cellulose, uniform the electric field distribution in oil-paper insulation system, and thus enhance the insulation property of transformers.

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34

Chen, Yi, Yue Peng, Wen Yong Liu, Guang Sheng Zeng, Xiang Gang Li y Wu Wang. "Effect of POSS on the Compatibility and Mechanical Properties of PC/PLA Blends". Applied Mechanics and Materials 427-429 (septiembre de 2013): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.170.

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Polycarbonate/poly (lactic acid)/(PC/PLA) blends were modified by two kinds of POSS, glycidyl POSS (G-POSS) and Octa-ammonium POSS (O-POSS), respectively. The morphologies and mechanical properties of blends were investigated systematically. The results showed that the adding of O-POSS has a better effect on the compatibility of blend than adding G-POSS, the separate phase is invisible in the morphology of blends, and the mechanical properties of blends are improved significantly with the increase of added O-POSS.

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35

Wang, Bing Tao, Yan Zhang y Zheng Ping Fang. "Synthesis and Characterization of Biodegradable Aliphatic-Aromatic Copolyesters Nanocomposites Containing POSS". Advanced Materials Research 236-238 (mayo de 2011): 2028–31. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2028.

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Biodegradable aliphatic-aromatic copolyesters/POSS nanocomposites were synthesized via in situ melt copolycondensation of terephthalic acid (TPA), poly(L-lactic acid) oligomer (OLLA), 1,4-butanediol (BDO) and polyhedral oligomeric silsesquioxanes (POSS) reagents (POSS-NH2 and POSS-PEG). The morphologies and dispersions of two POSS reagents in the nanocomposites and their effects on the mechanical and thermal properties were investigated. TEM and XRD characterizations confirmed that POSS-NH2 formed crystalline microaggregates and took poor dispersions in the nanocomposite, while POSS-PEG had better dispersion in the matrix. Due to the good dispersion and interfacial adhesion of POSS-PEG with the copolyester PBTL matrix, the tensile strength and the Young’s modulus greatly increased for PBTL/POSS-PEG nanocomposite. Moreover, compared with POSS-NH2 the existence of POSS-PEG imparted PBTL good flexibility and increased the mobility of the chains, so the glass-transition temperature and the heat of melting as well as the elongation at break were obviously influenced for PBTL/POSS-PEG nanocomposite.

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36

Wang, Mingyue, Hong Chi, Joshy K.S. y Fuke Wang. "Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane". Polymers 11, n.º 12 (14 de diciembre de 2019): 2098. http://dx.doi.org/10.3390/polym11122098.

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Polyhedral oligomeric silsesquioxane (POSS) has been considered as one of the most promising nanofillers in academic and industrial research due to its unique multifunctional nanostructure, easy functionalization, hybrid nature, and high processability. The progress of POSS has been extensive, particularly applications based on single- or multiple-armed POSS. In polymer hybrids, in order to enhance the properties, bifunctional POSS has been incorporated into the backbone chain of the polymer. This review summarizes recent developments in the synthesis, modification, and application of bifunctional POSS-containing composite materials. This includes amino-POSS, hydroxyl-POSS, aromatic ring-POSS, ether-POSS, and vinyl groups-POSS and their applications, exemplified by polyurethanes (PUs) and polyimides (PIs). In addition, the review highlights the enhancement of thermal, mechanical, and optical properties of the composites.

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Kosmalska, Anna, Anna Strąkowska y Marian Zaborski. "Properties of POSS/HNBR Elastomer Nanocomposites". Materials Science Forum 714 (marzo de 2012): 175–81. http://dx.doi.org/10.4028/www.scientific.net/msf.714.175.

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A series of composite materials containing polyhedral oligomeric silsesquioxanes (POSS) and hydrogenated butadiene-acrylonitrile rubber (HNBR) were prepared. The goal of the work was to evaluate the effect of the type and reactivity of functional groups in the POSS cage on properties of the resulting elastomeric nanocomposites. The paper presents some of the preliminary results obtained from the studies. The results indicate that incorporation of POSS into silica-filled HNBR elastomer network increases interfacial interactions of the systems and the POSS molecules can be successfully used as coagents of crosslinking towards the elastomer matrix and efficient additives improving the mechanical properties of elastomeric nanocomposites. Furthermore, evaluation of changes in mechanical properties, induced in a result of POSS/HNBR composites ageing, show that the inclusion of POSS in the HNBR network is directly influencing the stabilizing effect and improves the ageing resistance of elastomer composites.

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Liu, Wei, Shu Xia Wang, Jun Ming Dai y Guang Li. "Microstructure and Thermal Properties of PET/POSS Composites Prepared by In Situ Polymerization". Materials Science Forum 815 (marzo de 2015): 534–38. http://dx.doi.org/10.4028/www.scientific.net/msf.815.534.

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Poly(ethylene terephathalate)/1,2-propanediolisobutyl polyhedral oligomeric silsesquioxane (POSS) composites were prepared by in situ polymerization with 1.5-5.0 wt% loading of POSS. The dispersion of POSS in PET matrix was investigated by scanning electron microscope(SEM) the interaction between POSS and PET chains was studied by nuclear magnetic resonance(NMR) andX-ray photoelectron spectroscopy(XPS), and the thermal behavior of PET/POSS composites was investigated by DSC and TG as well as the melt rheological testing of PET/POSS. SEM observation suggests that POSS particles disperse evenly innanosize(80-100nm)in PET matrix, and this fine dispersion of POSS was further supported by XPS analysis, there is a covalent linkage presenting between POSS and PET chains. The crystallization temperature of the composites moved to high temperature as the POSS particles behave as the nucleating agent. The shear modulus(G’) increased apparently with the addition of POSS.

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Xu, Yiting, Jiangfeng Chen, Jiamei Huang, Jie Cao, Jean-François Gérard y Lizong Dai. "Nanostructure of reactive polyhedral oligomeric silsesquioxane-based block copolymer as modifier in an epoxy network". High Performance Polymers 29, n.º 10 (5 de octubre de 2016): 1148–57. http://dx.doi.org/10.1177/0954008316671792.

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To obtain a novel polyhedral oligomeric silsesquioxane (POSS)-based nanomodifier, copolymerization of methacrylate-POSS (MA-POSS) and glycidyl MA (GMA) was carried out via reversible addition-fragmentation chain transfer process. The as-synthesized poly(glycidyl methacrylate) (PGMA)-b-P(MA-POSS) block copolymers (BCPs) were characterized by proton nuclear magnetic resonance, Fourier transform infrared spectroscopy, and gel permeation chromatography. The introduction of a POSS component improved the thermostability of the BCP. Then, PGMA-b-P(MA-POSS) copolymer was reactively incorporated into 4,4′-methylenebis(2,6-diethylaniline) and the epoxy network. Compared with commercial inert MA-POSS-methyl MA (POSS-MMA) copolymers (15 wt% and 45 wt% POSS, respectively), PGMA-b-P(MA-POSS) can self-assemble in epoxy to micelles with diameters of 20–40 nm. Due to the formation of uniform nanostructures, reactive POSS-modified epoxy composites exhibited higher glass transition temperature and double the rubbery state moduli (87 MPa) than neat epoxy (41 MPa). This work provided an efficient way to fabricate a POSS-based nanocomposite via the introduction of nanomodifier PGMA-b-P(MA-POSS) which can pre-react with reactive monomer.

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Kozuma, Tomoya, Aki Mihata y Yoshiro Kaneko. "Preparation of Soluble POSS-Linking Polyamide and Its Application in Antifogging Films". Materials 14, n.º 12 (9 de junio de 2021): 3178. http://dx.doi.org/10.3390/ma14123178.

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In this study, we prepared a polyhedral oligomeric silsesquioxane (POSS)-linking polyamide (POSS polyamide) by a polycondensation of ammonium-functionalized POSS (POSS-A) and carboxyl-functionalized POSS (POSS-C) in dehydrated dimethyl sulfoxide (DMSO) using 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) as condensing agents. The obtained POSS polyamide was soluble in various highly polar solvents, and it could form a self-standing film. FT-IR, 1H NMR, and 29Si NMR analyses showed that POSS polyamide is a polymer in which POSS-A and POSS-C are linked almost linearly by amide bonds. Furthermore, the cast film obtained by heat-treating the polymer at 150 °C for 30 min exhibited excellent transparency and hard-coating (pencil scratch test: 5H) and antifogging properties (evaluation by water vapor exposure).

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Wang, Bing Tao, Ping Zhang y De Gao. "PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties". Advanced Materials Research 380 (noviembre de 2011): 290–93. http://dx.doi.org/10.4028/www.scientific.net/amr.380.290.

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In situ melt copolycondensation was proposed to prepare biodegradable copolyester nanocomposites based on degradable components poly(L-lactic acid) (PLA), rigid segments poly(butylene terephthalate) (PBT), and nanoparticles polyhedral oligomeric silsesquioxanes (POSS). The morphologies and dispersions of two POSS nanoparticles (POSS-NH2 and POSS-PEG) in the copolyester PLABT matrix and their effects on the mechanical properties were investigated. The results demonstrated that the morphologies and dispersions of POSS-NH2 and POSS-PEG showed quite different characteristics. POSS-PEG took better dispersion in the PLABT, while POSS-NH2 had poor dispersions and formed crystalline microaggregates. Due to the good dispersion and strong interfacial adhesion of POSS-PEG with the matrix, the tensile strength and Young’s modulus were greatly improved from 6.4 and 9.6 MPa for neat PLABT up to 11.2 and 70.7 MPa for PLABT/POSS-PEG nanocomposite. Moreover, the incorporation of POSS-PEG could impart macromolecular chains good flexibility and improve the mobility of the chains, so the the elongation at break of PLABT/POSS-PEG nanocomposite dramatically increased from 190 to 350 % compared with neat PLABT.

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Wang, Xiaotao, Zhuofan Chen, Yiwan Huang, Xiaotie Ye, Jiacheng Wang, Yuye Yang, Xuefeng Li y Zuifang Liu. "Liquid crystallinity and thermal properties of polyhedral oligomeric silsesquioxane/side-chain azobenzene hybrid copolymer". Nanotechnology Reviews 9, n.º 1 (11 de septiembre de 2020): 886–95. http://dx.doi.org/10.1515/ntrev-2020-0068.

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AbstractAcrylic acid-modified polyhedral oligomeric silsesquioxane (AC-POSS) was synthesized by the reaction between the amine groups in polyhedral oligomeric silsesquioxane (POSS) and acrylic acid, which could dissolve in water and can be easily purified. Free-radical copolymerization was applied to synthesize azobenzene liquid crystalline polymer silsesquioxane (LCP-POSS) with different proportions of AC-POSS and liquid crystalline monomers. The trans-isomers of azobenzene moieties in LCP-POSS were gradually transformed to cis-isomers with increasing ultraviolet irradiation time. The photoisomerization reaction of liquid crystalline polymer (LCP) and LCP-POSS showed the first-order dynamic reaction. Compared with the LCP, the photoisomerization rate constant of LCP-POSS was decreased due to the space steric hindrance of the POSS as a rigid segment. The phase transition temperature of liquid crystalline in LCP-POSS increased with increasing POSS content, and the liquid crystalline texture in LCP-POSS became smaller under the polarized light. With further increasing the POSS content (>50 wt%) in LCP-POSS, the ordered structure of the liquid crystalline phase was gradually affected, resulting in one-way liquid crystal (LC) phase behavior. The synthesized LCP-POSS has LC properties, light-responsive properties, and thermal stability. When the POSS is introduced into the LC material, the phase state of the LC material will become more abundant and the LC phase will become more stable. The significance of this study is to develop and extend its applications as stimuli-responsive materials and devices.

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Liu, Weiming, Guohua Hang, Honggang Mei, Lei Li y Sixun Zheng. "Nanocomposites of Polyhydroxyurethane with POSS Microdomains: Synthesis via Non-Isocyanate Approach, Morphologies and Reprocessing Properties". Polymers 14, n.º 7 (25 de marzo de 2022): 1331. http://dx.doi.org/10.3390/polym14071331.

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In this contribution, we reported the synthesis of a novel trifunctional POSS cyclic carbonate [POSS-3(5CC)]. With a difunctional five-member cyclic carbonate and a trifunctional polyetheramine as the precursor, the nanocomposites of polyhydroxyurethane (PHU) with POSS were synthesized. Transmission electron microscopy (TEM) showed that the nanocomposites of PHUs with POSS were microphase-separated; the spherical POSS microdomains via POSS-POSS interactions were generated with the size of 20~40 nm in diameter. After the introduction of POSS microdomains, the nanocomposites displayed improved thermal and mechanical properties. More importantly, the nanocomposites still displayed the reprocessing properties of vitrimers.

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Lipińska, Magdalena, Klaudia Toczek y Magdalena Stefaniak. "Viscoelastic Properties of Epoxidized Natural Rubber/Poly(lactic acid) PLA/ENR Blends Containing Glycidyl-POSS and Trisilanolisooctyl-POSS as Functional Additives". Materials 14, n.º 10 (20 de mayo de 2021): 2686. http://dx.doi.org/10.3390/ma14102686.

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The glycidyl-POSS (Polyhedral Oligomeric Silsesquioxanes, Polysilsesquioxane, POSS) (Gly-POSS) and trisilanolisooctyl-POSS (HO-POSS) were applied as functional additives influencing on the viscoelastic properties of the dynamic vulcanized PLA/ENR (poly(lactic acid)/epoxidized natural rubber) blends. The plasticizing effect of HO-POSS on PLA/ENR melt, leading to the decrease of complex viscosity at 160 °C, was observed. After the incorporation of Gly-POSS into PLA/ENR blends the complex viscosity increased confirming that the epoxy groups of Gly-POSS were able to react with the functional groups of ENR and the groups present at the end of PLA chains. The incorporation of Gly-POSS into 40:60 PLA/ENR blend provided significant enhancement of the storage shear modulus G’ at 30 °C. Furthermore, the glass transition temperatures Tg of ENR phase for PLA/ENR/Gly-POSS blends were shifted to higher values of temperature as compared with blends modified by HO-POSS. Strong reduction of the elongation at break Eb for 40:60 PLA/ENR/Gly-POSS blend indicated that Gly-POSS particles acted as multifunctional cross-links reducing elasticity of the material. The modification of 40:60 PLA/ENR blend by HO-POSS molecules led to lower values of composting coefficient KC indicating stronger deterioration of the mechanical properties that resulted from more intense degradation processes occurring during disposal in soil.

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45

Żak, Patrycja y Cezary Pietraszuk. "Application of olefin metathesis in the synthesis of functionalized polyhedral oligomeric silsesquioxanes (POSS) and POSS-containing polymeric materials". Beilstein Journal of Organic Chemistry 15 (4 de febrero de 2019): 310–32. http://dx.doi.org/10.3762/bjoc.15.28.

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This mini-review summarizes the applications of olefin metathesis in synthesis and functionalization of polyhedral oligomeric silsesquioxanes (POSS) and POSS-containing polymeric materials. Three types of processes, i.e., cross metathesis (CM) of vinyl-substituted POSS with terminal olefins, acyclic diene metathesis (ADMET) copolymerization of divinyl-substituted POSS with α,ω-dienes and ring-opening metathesis polymerization (ROMP) of POSS-substituted norbornene (or other ROMP susceptible cycloolefins) are discussed. Emphasis was put on the synthetic and catalytic aspects rather than on the properties and applications of synthesized materials.

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Zhao, Chun Bao, Xin Wang, Xu Jie Yang y Wei Zhao. "Thermal and Mechanical Properties of Poly(methyl methacrylate) Nanocomposites Containing Polyhedral Oligomeric Silsesquioxane". Advanced Materials Research 557-559 (julio de 2012): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.304.

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A series of poly(methyl methacrylate) (PMMA) composites containing polyhedral oligomeric silsesquioxane (POSS) were produced by bulk polymerization. The morphology, thermal and mechanical properties of the composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analyses (TGA) and dynamic mechanical analyses (DMA). Results show that the octa(3-chloropropyl)-POSS (ocp-POSS) and trisilanolphenyl-POSS (triol-POSS) have high compatibility with PMMA and can be uniformly dispersed into PMMA matrix. The separate incorporation of these two types of POSS contributes to the improvement of thermal stability of PMMA composites. When the content of POSS was 7.5 wt%, the thermal decomposition temperatures (5% mass loss) of PMMA composites with ocp-POSS and triol-POSS were increased by about 104 °C and 130 °C, respectively. The increase of triol-POSS content in the PMMA matrix gave slight enhanced storage modulus before glass transition.

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Ma, Jun Peng y Qi Fang Li. "Gelation Behavior, Morphology, Thermal and Viscoelastic Properties of Epoxy-Cyanate Ester/Polyhedral Oligomeric Silsesquioxane (POSS) Nanocomposites". Advanced Materials Research 11-12 (febrero de 2006): 323–26. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.323.

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Epoxy-cyanate (EP-CE) ester composites containing the inorganic-organic hybrid polyhedral oligomeric silsesquioxane (POSS) octaisobutyl(T8)-POSS (oib-POSS) were prepared. These EP-CE/POSS composites were characterized by gelation characteristics, transmission election microscopy (TEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermal gravimetric analyses (TGA) and dynamic mechanical analysis (DMTA). The glass transition temperature (Tg) and thermal decomposition temperature (Tdec) of composites increased compared with the neat epoxy-cyanate ester with the increment of POSS content. Additionally, all the EP-CE/POSS composites exhibited higher storage modulus (E’) values (temperature>Tg) than the pure resins. The loss factor peak intensities decreased as the weight percentage of POSS increases. TEM and XRD showed that phase-separated aggregates of POSS were found in matrix, because POSS did not react with the resin.

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Grewal, Seema. "An interview with Ken Poss". Development 147, n.º 12 (15 de junio de 2020): dev193078. http://dx.doi.org/10.1242/dev.193078.

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Wei, Bin, Jinglin Liu, Liangqi Ouyang y David C. Martin. "POSS-ProDOT crosslinking of PEDOT". Journal of Materials Chemistry B 5, n.º 25 (2017): 5019–26. http://dx.doi.org/10.1039/c7tb00598a.

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Alkoxy-functionalized polythiophenes such as poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT) have become promising materials for a variety of applications including bioelectronic devices due to their high conductivity, relatively soft mechanical response, good chemical stability and excellent biocompatibility.

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Nagao, Mayu, Taihei Hayashi, Hiroaki Imoto y Kensuke Naka. "Unsymmetric Dumbbell-Shaped Polyhedral Oligomeric Silsesquioxane (POSS) Compound as a Single-Component POSS Hybrid". Langmuir 37, n.º 50 (9 de diciembre de 2021): 14777–84. http://dx.doi.org/10.1021/acs.langmuir.1c02906.

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