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首页> 外文期刊>Polymers for advanced technologies >Design of new poly(ethylene) based materials by coordination (co)polymerization of macromonomers with ethylene
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Design of new poly(ethylene) based materials by coordination (co)polymerization of macromonomers with ethylene

机译：通过大分子单体与乙烯的配位（共）聚合设计新的基于聚乙烯的材料

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摘要

The present work discusses first the homopolymerization of ω-allyl, ω-undecenyl or ω-vinylbenzyl polystyrene (PS) macromonomers in the presence of selected early or late transition metal catalysts. Homopolymerization degrees were found to depend on the type of catalyst, the terminal double bond, the polymerization temperature and the concentration of the various species. Higher molar masses were reached at low temperatures and low catalyst and cocatalyst concentrations. Best results were obtained with the constrained geometry catalyst (CGC)-Ti. The same PS macromonomers were copolymerized with ethylene in the presence of the VERSIPOL catalyst to design a new type of poly(ethylene) based graft copolymer. The macromonomer weight percent content decreases with increasing ethylene pressure whereas the molar mass of the copolymer increases with ethylene pressure. The PS macromonomer content as well as the molar mass of the copolymer can be still increased by using α, ω-difunctional PS macromonomers. The dilute solution and solid-state behavior of these copolymers were examined and compared to those of poly(ethylenes) prepared under the same conditions.
机译：本工作首先讨论在选定的早期或晚期过渡金属催化剂存在下，ω-烯丙基，ω-十一碳烯基或ω-乙烯基苄基聚苯乙烯（PS）大分子单体的均聚。发现均聚度取决于催化剂的类型，末端双键，聚合温度和各种物质的浓度。在低温和低催化剂和助催化剂浓度下达到较高的摩尔质量。约束几何催化剂（CGC）-Ti获得了最佳结果。在VERSIPOL催化剂的存在下，将相同的PS大分子单体与乙烯共聚，以设计一种新型的基于聚乙烯的接枝共聚物。大分子单体的重量百分比含量随乙烯压力的增加而降低，而共聚物的摩尔质量随乙烯压力的增加而增加。通过使用α，ω-双官能的PS大分子单体，仍可以增加PS大分子单体的含量以及共聚物的摩尔质量。检查了这些共聚物的稀溶液和固态行为，并将其与在相同条件下制备的聚乙烯进行了比较。

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