基于ADMET和超支化技术制备聚合物增容剂研究界面失效机理

项目名称： 基于ADMET和超支化技术制备聚合物增容剂研究界面失效机理

项目编号： No.21204041

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 高分子科学

项目作者： 穆景山

作者单位： 宁波大学

项目金额： 25万元

中文摘要： 界面及相形态是决定聚合物合金性能的内在因素，而在不相容的共混体系中加入接枝和嵌段聚合物增容剂是控制界面及相形态的重要手段。界面失效的机理主要取决于增容剂的聚合度和面密度两个因素，当聚合度较低时，分子链易从本体中拔出而导致界面失效，即使增加面密度也是如此。虽然提高聚合度可以使增容剂的分子链与本体产生有效链缠结，但提高聚合度也限制了分子链的运动，从而导致在界面处能够达到的面密度降低，此时增容剂分子链虽然不会发生解缠结，但会因断链而使界面失效。本项目研究基于以上存在的问题，在深入分析共混组分的结构特征的基础上，将非环二烯异位聚合技术（ADMET）和超支化技术有机结合起来，在结构明确的功能聚烯烃的侧链或线性聚乙烯链两端引入超支化结构，从而结合了线性聚乙烯的结晶性和超支化结构的低粘度、高流变、大量末端官能团等优点，避免增容剂分子链从本体中拔出和断链而导致界面失效，进而丰富和发展聚合物增容理论。

中文关键词： 聚烯烃；嵌段共聚物；接枝共聚物；超支化聚合物；

英文摘要： Added graft and block copolymers to immiscible blends system as compatibilizers is an important method to control interface and phase morphology, which are internal factors to determine properties of polymer alloy. The failure mechanisms of interface are determined by the degree of polymerization (N) and the areal chain density of block copolymer chains at the interface (∑). With low degree of polymerization, the interface failed by pull-out of short chains from matrix, even if at high areal chain density. For very high degree of polymerization, the chains are entangled with matrix effectively. But the maximum areal density of copolymer chains can be achieved at the interface is low due to the influence of kinetics, so fracture occurs by chain scission rather than chain disentanglement. In view of existing problems above, we combine Acyclic Diene Metathesis (ADMET) with hyperbranch polymerization technique. By this way, hyperbranched structures are introduced into well-defined architectures of side-chains of functionalized polyethylenes or both ends of the chain of linear polyethylenes. Thus, the crystallinity of linear polyethylene can be combined with low viscosity, high flow and a large number of end functional groups of hyperbranched structure, avoiding the interface failed by chain pull-out from matrix or c

英文关键词： polyolefins；block copolymer；graft copolymer；hyperbranched polymer；