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Preparation of Comb-Shaped Polyolefin Elastomers Having Ethylene/1-Octene Copolymer Backbone and Long Chain Polyethylene Branches via a Tandem Metallocene Catalyst System
Macromolecules ( IF 5.1 ) Pub Date : 2018-10-29 00:00:00 , DOI: 10.1021/acs.macromol.8b01711 Kailun Zhang 1 , Pingwei Liu 1 , Wen-Jun Wang 1 , Bo-Geng Li 1 , Weifeng Liu 2 , Shiping Zhu 3, 4
Macromolecules ( IF 5.1 ) Pub Date : 2018-10-29 00:00:00 , DOI: 10.1021/acs.macromol.8b01711 Kailun Zhang 1 , Pingwei Liu 1 , Wen-Jun Wang 1 , Bo-Geng Li 1 , Weifeng Liu 2 , Shiping Zhu 3, 4
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A novel type of comb-branched ethylene/1-octene copolymer elastomers (CPOEs) was synthesized, and their properties were systematically investigated in this work. The polymers had crystalline polyethylene (PE) long chain branches attached to amorphous ethylene/1-octene random copolymer backbones. The unique structure was generated through a tandem catalyst system consisting of a Zr ligated with phenoxycycloalkylimine (FI-Zr) and a constrained geometry catalyst (CGC-Ti). Linear PE macromonomers, with over 88% chains terminally unsaturated, were synthesized with the FI-Zr catalyst, while the CGC-Ti catalyst was employed in the copolymerization of ethylene, 1-octene, and the PE macromonomer. The resulting CPOEs possessed high melting temperature (>120 °C) and low glass transition temperature (<−60 °C), suggesting a phase separation occurred in the copolymer system. The measurement of mechanical properties showed that the elongation at break reached >1200%. Some samples performed better strain recovery than the commercial POE Engage 8150.
中文翻译：
通过串联茂金属催化剂体系制备具有乙烯/ 1-辛烯共聚物骨架和长链聚乙烯支链的梳形聚烯烃弹性体
合成了一种新型的梳状支链乙烯/ 1-辛烯共聚物弹性体（CPOE），并在这项工作中系统地研究了它们的性能。该聚合物具有连接到无定形乙烯/ 1-辛烯无规共聚物主链上的结晶聚乙烯（PE）长链分支。独特的结构是通过串联催化剂系统生成的，该系统由与苯氧基环烷基亚胺连接的Zr（FI-Zr）和几何约束催化剂（CGC-Ti）组成。使用FI-Zr催化剂合成了末端不饱和链超过88％的线性PE大分子单体，而CGC-Ti催化剂用于乙烯，1-辛烯和PE大单体的共聚。所得的CPOE具有较高的熔化温度（> 120°C）和较低的玻璃化转变温度（<−60°C），这表明在共聚物体系中发生了相分离。力学性能的测量表明断裂伸长率达到＞ 1200％。一些样品的应变恢复性能优于商用POE Engage 8150。
更新日期：2018-10-29
中文翻译：
通过串联茂金属催化剂体系制备具有乙烯/ 1-辛烯共聚物骨架和长链聚乙烯支链的梳形聚烯烃弹性体
合成了一种新型的梳状支链乙烯/ 1-辛烯共聚物弹性体（CPOE），并在这项工作中系统地研究了它们的性能。该聚合物具有连接到无定形乙烯/ 1-辛烯无规共聚物主链上的结晶聚乙烯（PE）长链分支。独特的结构是通过串联催化剂系统生成的，该系统由与苯氧基环烷基亚胺连接的Zr（FI-Zr）和几何约束催化剂（CGC-Ti）组成。使用FI-Zr催化剂合成了末端不饱和链超过88％的线性PE大分子单体，而CGC-Ti催化剂用于乙烯，1-辛烯和PE大单体的共聚。所得的CPOE具有较高的熔化温度（> 120°C）和较低的玻璃化转变温度（<−60°C），这表明在共聚物体系中发生了相分离。力学性能的测量表明断裂伸长率达到＞ 1200％。一些样品的应变恢复性能优于商用POE Engage 8150。
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