Morphological adjustment determines the properties of cationically polymerized epoxy resins
Morphological adjustment determines the properties of cationically polymerized epoxy resins
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DOI：
10.1039/c5ra03042k
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发表时间：
2015-05
期刊：
影响因子：
3.9
通讯作者：
Andre Arnebold;K. Thiel;E. Kentzinger;A. Hartwig
中科院分区：
文献类型：
--
作者：
Andre Arnebold;K. Thiel;E. Kentzinger;A. Hartwig
介绍了一种阳离子聚合脂环族环氧树脂的形态调控。为此，环氧树脂与反应性聚（ε-己内酯）（PCL-二醇）和非反应性聚（PCL-二酯）聚合，分别产生不同形态的共聚物和聚合物合金。小角X射线散射（SAXS）表明，所形成的纳米结构是反应诱导微相分离（RIMS）机制的结果。活化的单体机制（AM）比活化的链端机制（ACE）进行得更快，导致PCL-二醇优选整合到环氧网络中，从而部分抑制了分离，特别是对于小的聚酯含量。结果表明，酯化PCL不与环氧树脂反应，使其被迫分离的球晶域的形式大大。这通过STEM成像、结晶度的出现以及与其可比共聚物相比增强的玻璃化转变温度来显示。
The morphological adjustment of a cationically polymerized cycloaliphatic epoxy resin is presented. For this purpose, the epoxy resin is polymerized both with a reactive poly(e-caprolactone) (PCL-diol) and a unreactive one (PCL-diester) leading to a copolymer and a polymer alloy of different morphologies, respectively. Small-angle X-ray scattering (SAXS) shows that the formed nanostructures are the result of the reaction-induced microphase separation (RIMS) mechanism. The activated monomer mechanism (AM) proceeded faster than the activated chain end mechanism (ACE) leading to a preferred integration of PCL-diol into the epoxy network so that segregation is partially inhibited, especially for small polyester contents. It was shown that esterified PCL did not react with the epoxy resin so that it was forced to segregate greatly in the form of spherulitic domains. This was shown by STEM imaging, by the occurrence of crystallinity, as well as by enhanced glass transition temperatures compared to its comparable copolymers.