Morphology development via reaction-induced phase separation in flexible polyurethane foam
Morphology development via reaction-induced phase separation in flexible polyurethane foam
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DOI：
10.1021/ma020035e
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发表时间：
2002-06-18
期刊：
影响因子：
5.5
通讯作者：
Meier, IK
中科院分区：
文献类型：
--
作者：
Li, W;Ryan, AJ;Meier, IK
用时间分辨小角X射线散射研究了聚氨酯软泡在反应诱导相分离过程中的形态发展。研究了基于工业配方的两种不同的PU发泡体系。使用Cahn-Hilliard模型分析散射数据，并拟合Teubner-Strey微乳液结构因子以提取形态特征。观察到微相分离遵循调幅分解动力学;双连续形态发展，随后通过尿素域的玻璃化来保存。数据分析表明，随着反应的进行，两亲性因子增加，由于连续形成嵌段共聚物聚（醚-脲）。
Morphology development during reaction-induced phase separation in flexible polyurethane (PU) foam has been studied by time-resolved, small-angle X-ray scattering. Two different PU foaming systems, based on industrial formulations, have been studied. The scattering data have been analyzed using the Cahn-Hilliard model and fit to a Teubner-Strey microemulsion structure factor to extract morphological characteristics. Microphase separation was observed to follow spinodal decomposition kinetics; a bicontinuous morphology developed and was subsequently preserved by vitrification of the urea domains. The data analysis demonstrated that the amphiphilicity factor increases as the reactions proceed, due to the continuous formation of block copolymer poly(ether-urea).