Crystallinity as New Toughening Concept for Epoxy Resins:Influence of Branching of Integrated Polyester
Crystallinity as New Toughening Concept for Epoxy Resins:Influence of Branching of Integrated Polyester
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结晶度作为环氧树脂增韧的新概念：集成聚酯支化的影响
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Hartwig
中科院分区：
文献类型：
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作者：
Arne Stra burg;Hendrik Lűtzen;A. Hartwig
通常用于结构粘合剂的环氧树脂通过不同支化度的聚（ε-己内酯）（PCL）增韧。这些 PCL 具有相同的摩尔质量，并且每个臂均以羟基封端。 PCL 通过活化单体机制整合到脂环族环氧树脂热诱导阳离子聚合过程中形成的环氧网络中。 PCL 形成与环氧网络共价结合的域，域尺寸随着 PCL 支化的增加而减小。有趣的是，这些域显示出非晶态和晶态行为的特征。形成的环氧树脂的韧性随着域尺寸的减小而增加，换句话说，PCL 支化程度的增加。
Epoxy resins typically applied for structural adhesives were toughened by poly(ε-caprolactones) (PCL) with different degree of branching. These PCL have the same molar mass and each arm is terminated with a hydroxyl group. The PCL were integrated into the epoxy network formed during the thermally induced cationic polymerization of a cycloaliphatic epoxy resin by the activated monomer mechanism. The PCL form domains covalently bound to the epoxy network and domain size decreases with increasing branching of the PCL. Interestingly the domains show characteristics from amorphous as well as crystalline behavior. Toughness of the formed epoxy resins increase with decreasing size of the domains in other words increasing degree of PCL branching.