The viscoelastic effects during reaction induced phase separation play an important role in toughening epoxy-based blends. The large difference in molecular weight/glass transition temperature between the blend components before the curing reaction results in dynamic asymmetry, causing viscoelastic effects during phase separation accompanying the curing reaction. This review will focus on the key factors responsible for viscoelastic phase separation in epoxy-based blends and hybrid nanocomposites. Time-resolved characterization techniques such as rheometry, small angle laser light scattering, optical microscopy etc., are mainly used for monitoring the viscoelastic effects during phase separation. Incorporation of nanofillers in epoxy thermoplastic blends enhances the viscoelastic phase separation due to the increase in dynamic asymmetry. Different theoretical models are identified for the determination of processing parameters such as temperature, viscosity, phase domain size, and other parameters during the viscoelastic phase separation process. The effect of viscoelastic phase separation has a very strong influence on the domain parameters of the blends and thereby on the ultimate properties and applications.

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环氧共混物中的粘弹性相分离概述

反应引起的相分离过程中的粘弹性效应在增韧环氧基混合物方面起着重要作用。在固化反应之前，共混物组分之间分子量/玻璃化转变温度的较大差异导致动态不对称，从而在伴随固化反应的相分离过程中引起粘弹性效应。这篇综述将集中在环氧基混合物和杂化纳米复合材料中引起粘弹性相分离的关键因素上。时间分辨的表征技术，例如流变学，小角度激光散射，光学显微镜等。，主要用于监测相分离过程中的粘弹性效应。由于动态不对称性的增加，将纳米填料掺入环氧热塑性共混物中可增强粘弹性相分离。确定了不同的理论模型，用于确定粘弹性相分离过程中的加工参数，例如温度，粘度，相域大小和其他参数。粘弹性相分离的效果对共混物的域参数具有非常强的影响，从而对最终性能和应用具有很大的影响。