首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Reaction-induced microphase separation in polybenzoxazine thermosets containing poly(N-vinyl pyrrolidone)-block-polystyrene diblock copolymer
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Reaction-induced microphase separation in polybenzoxazine thermosets containing poly(N-vinyl pyrrolidone)-block-polystyrene diblock copolymer

机译:含聚(N-乙烯基吡咯烷酮)-嵌段-聚苯乙烯二嵌段共聚物的聚苯并恶嗪热固性材料中反应诱导的微相分离

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摘要

Poly(N-vinyl pyrrolidone)- block-polystyrene diblock copolymer (PVPy- b-PS) was synthesized via sequential reversible radical-fragmentation transfer polymerization with S-1-phenylethyl O-ethylxanthate as a chain transfer agent. The block copolymer was incorporated into polybenzoxazine to access the nanostructures in the thermosets. The nanostructures in the thermosets were investigated by means of transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). It was found that disordered and/or ordered PS nanophases were formed in the PBa thermosets. It is judged that the formation of nanophases followed the mechanism of reaction-induced microphase separation in terms of the miscibility of the subchains of the diblock copolymer (viz. PVPy and PS) with polybenzoxazine after and before curing reaction.
机译:通过以S-1-苯基乙基O-乙基黄原酸酯为链转移剂的顺序可逆自由基断裂转移聚合反应,合成了聚(N-乙烯基吡咯烷酮)-嵌段-聚苯乙烯二嵌段共聚物(PVPy-b-PS)。将嵌段共聚物掺入聚苯并恶嗪中以进入热固性材料中的纳米结构。通过透射电子显微镜(TEM)和小角X射线散射(SAXS)研究了热固性塑料中的纳米结构。发现在PBa热固性材料中形成无序和/或有序的PS纳米相。就固化反应之后和之前,二嵌段共聚物(即PVPy和PS)与聚苯并恶嗪的亚链的混溶性而言,可以认为纳米相的形成遵循了反应诱导的微相分离的机理。

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