Microphase separation in polybenzoxazine thermosets containing benzoxazine-terminated poly(ethylene oxide) telechelics

Microphase separation in polybenzoxazine thermosets containing benzoxazine-terminated poly(ethylene oxide) telechelics
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含有苯并恶嗪封端的聚环氧乙烷遥爪的聚苯并恶嗪热固性材料中的微相分离

DOI:
10.1016/j.eurpolymj.2011.05.003
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发表时间:
2011-08
影响因子:
6
通讯作者:
--
中科院分区:
化学2区
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--
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合成了苯并恶嗪封端的聚环氧乙烷遥爪(Ba-封端的PEO),并将其引入到聚苯并恶嗪中以获得纳米结构的热固性材料。采用原子力显微镜(AFM)、小角X射线散射(SAXS)和动态力学分析(DMA)对热固材料的形貌进行了研究。热固性复合材料中纳米相结构的形成是基于反应诱导微相分离(RIMPS)机理进行的,这与聚苯并恶嗪与端羟基聚环氧乙烷的二元热固性共混物形成了鲜明的对比。RIMPS的发生是由于Ba封端的PEO遥爪的端基与热固性基质的前体(即,苯并恶嗪),这抑制了宏观相分离的发生。研究发现,纳米结构的形成对热固性材料中PEO的熔融行为、PBZ热固性材料的热转变性能有显著影响。
Benzoxazine-terminated poly(ethylene oxide) telechelics (Ba-terminated PEO) was synthesized and incorporated into polybenzoxazine to obtain the nanostructured thermosets. The morphology of the thermosets was investigated by means of atomic force microscopy (AFM), small angle X-ray scattering (SAXS) and dynamic mechanical analysis (DMA). The formation of the nanophase structures in the thermosetting composites was addressed on the basis of the mechanism of reaction-induced microphase separation (RIMPS), which was in marked contrast to the case of the binary thermosetting blends of polybenzoxazine with hydroxyl-terminated poly(ethylene oxide). The occurrence of RIMPS resulted from the copolymerization reaction of the end groups of Ba-terminated PEO telechelics with the precursor of thermosetting matrix (i.e., benzoxazine), which suppressed the occurrence of the macroscopic phase separation. It was found that the formation of the nanostructures has a significant effect on the melting behavior of PEO in the thermosets, thermal transition properties of the PBZ thermosets.
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