Relevant bibliographies by topics / Α-olefin copolymer

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Α-olefin copolymer'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Α-olefin copolymer"

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Mühlenbrock, Peter H., and Gerhard Fink. "Ethen/1-Hexen- und 1-Octadecen-Copolymerisation mit dem stereorigiden Zirkon-Katalysatorsystem iPr(CpFlu)ZrCl2/MAO: Einfluß der Temperatur / Copolym erization of Ethene/1-Hexene and 1-Oetadecen with the Stereorigid Zirconium Catalyst System iPr(CpFlu)ZrCl2/MAO : Influence of the Temperature." Zeitschrift für Naturforschung B 50, no. 3 (March 1, 1995): 423–29. http://dx.doi.org/10.1515/znb-1995-0317.

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Ethene was copolymerized with 1-hexene and 1-octadecene at different temperatures to study the influence of the temperature. The stereorigid catalyst [2,4-cyclopentadien-1-yliden- (iso-propyliden)fluoren-9-yliden]zirconium dichloride iPr(CpFlu )ZrCl2 1 in combination with methylalumoxane MAO was used. The polymerization rate of ethene depends in a wide range on the temperature and the com onom er content in solution. In each case a large rate enhancem ent at low ratios [com onom er]/[ethene] was observed. A t 25 °C the polymerization rate of ethene increases continuously with increasing [1-hexene]/[ethene]-ratio. At 40 °C the consumption of ethene is nearly independent of the 1-hexene content in solution. Finally, at 60 °C, similar to the ethene/1-octadecene-copolymerisation at different temperatures, the polymerization rate of ethene decreases with increasing [1-hexene]/[ethene]-ratio. It is suggested that this behavior is caused by the mobility of the side chains in the copolym er near the active center, probably for sterical reasons. W ith increasing temperatures, the side chain becomes more and more flexible and thus the sterical hindrance is increased. This effect is even stronger with long chain α-olefins.The microstructure of the copolymer was investigated with respect to Marcovian statistic 1. and 2. order. The experimental triad distribution is described satisfactorily only with the second order statistic. Independent of the temperature the r22 parameter is considerably greater than the r12 parameter, the insertion of an α-olefin thus being more favored for he sequence {R -(α-olefine)-(α-olefine)-Kat.} than for {R -(ethene)-(α-olefine)-Kat.}. It therefore appears that both last inserted monomers influence the insertion of the subsequent monomer, especially at high comonomer contents. Furthermore, the parameters for the α-olefin insertions r22 and r12 are nearly independent of the temperature of polymerization, whereas the r11 and r21 parameters increase with increasing temperature.
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Derry, Matthew J., Lee A. Fielding, and Steven P. Armes. "Industrially-relevant polymerization-induced self-assembly formulations in non-polar solvents: RAFT dispersion polymerization of benzyl methacrylate." Polymer Chemistry 6, no. 16 (2015): 3054–62. http://dx.doi.org/10.1039/c5py00157a.

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Diblock copolymer spheres, worms and vesicles are prepared via RAFT dispersion polymerization of benzyl methacrylate in either mineral oil or a poly(α-olefin) using polymerization-induced self-assembly; an efficient ‘one-pot’ protocol is reported for spheres at 30% solids in mineral oil.
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Zhu, Lei, Haojie Yu, Li Wang, Yusheng Xing, and Bilal Ul Amin. "Advances in the Synthesis of Polyolefin Elastomers with “Chain-walking” Catalysts and Electron Spin Resonance Research of Related Catalytic Systems." Current Organic Chemistry 25, no. 8 (April 28, 2021): 935–49. http://dx.doi.org/10.2174/1385272825666210126100641.

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In recent years, polyolefin elastomers play an increasingly important role in industry. The late transition metal complex catalysts, especially α-diimine Ni(II) and α-diimine Pd(II) complex catalysts, are popular “chain-walking” catalysts. They can prepare polyolefin with various structures, ranging from linear configuration to highly branched configuration. Combining the “chain-walking” characteristic with different polymerization strategies, polyolefins with good elasticity can be obtained. Among them, olefin copolymer is a common way to produce polyolefin elastomers. For instance, strictly defined diblock or triblock copolymers with excellent elastic properties were synthesized by adding ethylene and α-olefin in sequence. As well as the incorporation of polar monomers may lead to some unexpected improvement. Chain shuttling polymerization can generate multiblock copolymers in one pot due to the interaction of the catalysts with chain shuttling agent. Furthermore, when regarding ethylene as the sole feedstock, owing to the “oscillation” of the ligands of the asymmetric catalysts, polymers with stereo-block structures can be generated. Generally, the elasticity of these polyolefins mainly comes from the alternately crystallineamorphous block structures, which is closely related to the characteristic of the catalytic system. To improve performance of the catalysts and develop excellent polyolefin elastomers, research on the catalytic mechanism is of great significance. Electron spin resonance (ESR), as a precise method to detect unpaired electron, can be applied to study transition metal active center. Therefore, the progress on the exploration of the valence and the proposed configuration of catalyst active center in the catalytic process by ESR is also reviewed.
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Nitta, Koh-hei, Keikichi Okamoto, and Masayuki Yamaguchi. "Mechanical properties of binary blends of polypropylene with ethylene-α-olefin copolymer." Polymer 39, no. 1 (January 1998): 53–58. http://dx.doi.org/10.1016/s0032-3861(97)00239-5.

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Zhou, Xiang, Jiachun Feng, Dong Cheng, Jianjun Yi, and Li Wang. "Different crystallization behavior of olefin block copolymer in α- and β-polypropylene matrix." Polymer 54, no. 17 (August 2013): 4719–27. http://dx.doi.org/10.1016/j.polymer.2013.06.034.

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Hunke, Harald, Navneet Soin, Andreas Gebhard, Tahir Shah, Erich Kramer, Kurt Witan, Anand Arcot Narasimulu, and Elias Siores. "Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66." Wear 338-339 (September 2015): 122–32. http://dx.doi.org/10.1016/j.wear.2015.06.003.

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Coiai, Serena, Francesca Cicogna, Chengcheng Yang, Veronika Tempesti, Sabrina Carroccio, Giuliana Gorrasi, Raniero Mendichi, Nadka Dintcheva, and Elisa Passaglia. "Grafting of Hindered Phenol Groups onto Ethylene/α-Olefin Copolymer by Nitroxide Radical Coupling." Polymers 9, no. 12 (December 4, 2017): 670. http://dx.doi.org/10.3390/polym9120670.

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Guo, Yintian, Zhenmei Cheng, Shaofei Song, Yuhong Weng, Anyang Wu, Junting Xu, Zhisheng Fu, and Zhiqiang Fan. "Synthesis of multiblock ethylene/long-chain α-olefin copolymer via chain walking polymerization using thermostable α-diimine nickel catalyst." Journal of Polymer Science Part A: Polymer Chemistry 55, no. 17 (June 23, 2017): 2725–29. http://dx.doi.org/10.1002/pola.28692.

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Chen, Fei, Robert A. Shanks, and Gandara Amarasinghe. "Structural and Mechanical Properties Changes of Ethylene-α-olefin Copolymer Blends Induced by Thermal Treatments and Composition." Macromolecular Materials and Engineering 289, no. 6 (June 25, 2004): 552–61. http://dx.doi.org/10.1002/mame.200300387.

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Kakhramanov, N. T., I. V. Bayramova, V. S. Osipchik, A. D. Ismayilzade, S. R. Abdalova, I. A. Ismayilov, and U. V. Namazli. "PHYSICOMECHANICAL PROPERTIES OF NANOCOMPOSITES BASED ON COPOLYMERS OF ETHYLENE WITH α-OLEFINS AND CLINOPTILOLITE." Azerbaijan Chemical Journal, no. 4 (December 12, 2020): 22–27. http://dx.doi.org/10.32737/0005-2531-2020-4-22-27.

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The results of studying the effect of clinoptilolite concentration on the properties of nanocomposites based on of ethylene with butylene and of ethylene with hexene copolymer are presented. The effect of clinoptilolite particle size on ultimate tensile stress, elongation at break, flexural modulus, heat resistance, and melt flow index of composites was studied. It is shown that nanocomposites based on ethylene copolymers are characterized by higher values of physicomechanical properties. The additional use of ingredients such as alizarin and calcium stearate contributes to a significant improvement in the complex of properties of nanocomposites based on ethylene copolymers and clinoptilolite
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Dissertations / Theses on the topic "Α-olefin copolymer"

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Zakrzewska, Sabina. "Synthesis of α-olefin-based copolymers and nanocomposites." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-166518.

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The research goal of this work was dedicated to improvement of the properties and enhancement of the application potential of commodity polymer based on polyolefins by choosing different synthesis routes to create new structures and materials. More precisely, the presented study explores different aspects of metallocene and post-metallocene catalyzed olefin polymerization leading to synthesis of novel copolymers and nanocomposites. The first part of this thesis deals with controlled polymerization of α-olefins catalyzed by post-metallocenes. Bis(phenoxyamine) zirconium complexes with [ONNO]-type ligands bearing cumyl (bPA-c) and 1-adamantyl (bPA-a) ortho-substituents were applied. For the polymerization catalyzed by bPA catalyst quasi-living kinetic character is proposed. The bPA catalyst was applied for synthesis of block copolymers by employing the strategy of sequential monomer addition. The blocky structure of the copolymer was successfully achieved and confirmed by NMR techniques. Moreover, the monomodal distribution of molar mass in SEC chromatogram confirmed the absence of homopolymers. In the second part of the work new defined comb-like copolymers (CLC) having a poly(10-undecene-1-ol) (PUol) backbone and densely grafted poly(ε-caprolactone) (PCL) side chains are presented. These copolymers were synthesized in two steps by means of metallocene polymerization followed by ring opening polymerization. Copolymers with varied and adjustable graft length (PCL segments) were synthesized. It was proved that the melting and crystallization temperatures of the CLC correlate with the PCL side chain length, i.e. longer chains result in higher Tm and Tc,o values. The melting enthalpy was found to be asymptotically dependent on the length of PCL side chains. The bulk morphology of the comb-like copolymers is proposed to be lamellar as judged from the TEM micrographs. The third part of the thesis is focused on the synthesis of polypropylene nanocomposites via in situ polymerization. Thereby, organomodified aluminumphosphate with kanemite-type layered structure (AlPO-kan) has been used as novel filler. Melt compounding composites were prepared for comparison purposes to evaluate the influence of in situ synthesis on the dispersion quality of the filler in polymer matrix. Melt compounding of neat AlPO-kan with PP did not lead to formation of nanocomposites. TEM images show macro-composites with the lamellar solid remaining agglomerated. On the contrary, in situ polymerization of propene yielded materials with exfoliated nanocomposite morphology. In XRD, diffractions of the AlPO-kan pilling of layers are not detectable. It can be concluded that the primary existing layers are delaminated. Very fine distribution of the filler in the polypropylene matrix has been impressively demonstrated by TEM.
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Zakrzewska, Sabina [Verfasser], Brigitte [Akademischer Betreuer] Voit, Ulrich [Akademischer Betreuer] Schulze, and Michael [Akademischer Betreuer] Buchmeiser. "Synthesis of α-olefin-based copolymers and nanocomposites / Sabina Zakrzewska. Gutachter: Brigitte Voit ; Michael Buchmeiser. Betreuer: Brigitte Voit ; Ulrich Schulze." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://d-nb.info/1073781038/34.

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Alkhazaal, Abdulaal. "Characterization of Ethylene/α-Olefin Copolymers Made with a Single-Site Catalyst Using Crystallization Elution Fractionation." Thesis, 2011. http://hdl.handle.net/10012/6132.

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A new analytical technique to measure the chemical composition distribution (CCD) of polyolefins, crystallization elution fractionation (CEF), was introduced in 2006 during the First International Conference on Polyolefin Characterization. CEF is a faster and higher resolution alternative to the previous polyolefin CCD analytical techniques such as temperature rising elution fractionation (TREF) and crystallization elution fractionation (CRYSTAF) (Monrabal et al., 2007). Crystallization elution fractionation is a liquid chromatography technique used to determine the CCD of polyolefins by combining a new separation procedure, dynamic crystallization, and TREF. In a typical CEF experiment, a polymer solution is loaded in the CEF column at high temperature, the polymer is allowed to crystallize by lowering the solution temperature, and then the precipitated polymer is eluted by a solvent flowing through the column as the temperature is raised. CEF needs to be calibrated to provide quantitative CCD results. A CEF calibration curve consists of a mathematical relationship between elution temperature determined by CEF and comonomer fraction in the copolymer that could be estimated by Fourier transform infrared spectroscopy (FTIR) and carbon-13 nuclear magnetic resonance (13C NMR). Different comonomer types in ethylene/α-olefin copolymers will have distinct calibration curves. The main objective of this thesis is to obtain CEF calibration curves for several different ethylene/α-olefin copolymers and to investigate which factors influence these calibration curves. A series of homogeneous ethylene/α-olefin copolymers (1-hexene, 1-octene and 1-dodecene) with different comonomer fractions were synthesized under controlled conditions to create CEF calibration standards. Their average chemical compositions were determined by 13C NMR and FTIR and then used to establish CEF calibration curves relating elution temperature and comonomer molar fraction in the copolymer.
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Stadler, Florian J. [Verfasser]. "Molecular structure and rheological properties of linear and long-chain branched ethene-, α-olefin [alpha-olefin] copolymers = Molekulare Struktur und rheologische Eigenschaften von linearen und langkettenverzweigten Ethen-, α-Olefincopolymeren [Alpha-Olefincopolymeren] / vorgelegt von Florian Johannes Stadler." 2007. http://d-nb.info/984032061/34.

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Tseng, Fuyuan, and 曾富原. "Preparation of Structurally Well-Defined Stereoregular Poly(α-olefins)-Based Diblock Copolymers and Their Self-Assembled Nanostructure Studies." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/51437398631623503008.

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博士
國立中正大學
化學工程研究所
99
In this study, I demonstrate several unique and controllable synthetic methods that offer the preparation of stereoregular polyolefins diblock copolymers via postpolymerization of end-functionalized stereoregular prepolymer routes. In the new synthetic route, the end-functionalized stereoregular prepolymer were prepared via inducing selective chain transfer reaction during stereospecific polymerization of α-olefins conducted in the presence of stereoregular metallocene catalysts. Structurally well-defined stereoregular diblock copolymers composing of a stereoregular block including syndiotactic polypropylene, syndiotactic polyallyltrimethyl- silane, syndiotactic poly(4-methyl-1-pentene) or isotactic poly(1-pentene) and a polyester block (eg., polylactide and poly(ε-caprolactone)) have been prepared using controlled ring-opening copolymerization of cyclic esters, including ε-caprolactone and DL-lactide, mediated by aluminum alkoxide end-capped polyolefins as the macroinitiator. The aluminum alkoxide end-capped polyolefins were generated by the in situ activation of hydroxyl-capped stereoregular polyolefins with triethylaluminum (TEA). The hydroxy- capped polyolefins were prepared via the selective chain transfer reaction to TEA while inducing the stereospecific polymerization of olefins in the presence of ansa-metallocene catalysts. The synthetic method not only offers high-yield production of the stereoregular block copolymers but also provides successful linking of the stereoregular polyolefins with an abundant variety of polymers as the second block. Moreover, the synthetic method offers effective control over the block chain length and molecular weight distribution; thus, microphase separation of the resultant diblock copolymers generated well-ordered nanostructures as revealed by SAXS scattering and TEM.
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Book chapters on the topic "Α-olefin copolymer"

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Schouterden, P., G. Groeninckx, and H. Reynaers. "Crystallinity and Morphology of Ethylene/ α-Olefin Copolymers." In Advances in Polyolefins, 373–80. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-9095-5_27.

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Halász, L., O. Vorster, and Á. Vincze. "Relaxation spectrum calculation methods and their use to determine the molecular mass distribution of propylene, ethylene and α-olefin random copolymers." In From Colloids to Nanotechnology, 155–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-45119-8_26.

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Yano, Akihiro, and Akira Akimoto. "Ethylene/α-olefin Copolymers with Metallocene Catalysts in High Pressure Process." In Metallocene Catalyzed Polymers, 97–102. Elsevier, 1998. http://dx.doi.org/10.1016/b978-188420759-4.50012-7.

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Hosoda, S., A. Uemura, Y. Shigematsu, I. Yamamoto, and K. Kojima. "34. Structure and Properties of Ethylene / α-Olefin Copolymers Polymerized with Homogeneous and Heterogeneous Catalysts." In Studies in Surface Science and Catalysis, 365–72. Elsevier, 1994. http://dx.doi.org/10.1016/s0167-2991(08)63050-5.

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Conference papers on the topic "Α-olefin copolymer"

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Halász, L., K. Belina, and A. Szücs. "Thermal degradation of poly(olefin-α olefin) copolymers." In PROCEEDINGS OF PPS-29: The 29th International Conference of the Polymer Processing Society - Conference Papers. American Institute of Physics, 2014. http://dx.doi.org/10.1063/1.4873768.

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Walton, Kim L., John D. Pomije, and Tim Clayfield. "Ethylene/α-olefin Copolymers for Automotive Interiors." In SAE 2000 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-0747.

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Stadler, Florian J., Helmut Münstedt, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "Elastic and Viscous Properties of Linear and Long-Chain Branched Ethene∕α-Olefin Copolymers in the Terminal Regime." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964732.

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Tranninger, Cornelia, Floran Prades, Walter Schaffer, and Markus Gahleitner. "Impact modification of polypropylene with ethylene-α-olefin copolymers: Influence of density and comonomer type on structure and properties." In TIMES OF POLYMERS (TOP) AND COMPOSITES 2014: Proceedings of the 7th International Conference on Times of Polymers (TOP) and Composites. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4876786.

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