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首页> 外文期刊>Journal of Applied Polymer Science >Effects of the Molecular Weight of Poly(ether imide) on the Viscoelastic Phase Separation of Poly(ether imide)/Epoxy Blends
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Effects of the Molecular Weight of Poly(ether imide) on the Viscoelastic Phase Separation of Poly(ether imide)/Epoxy Blends

机译：聚醚酰亚胺分子量对聚醚酰亚胺/环氧共混物粘弹性相分离的影响

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摘要

The phase separation of diglycidyl ether of bisphenol A/methyl tetrahydrophthalic anhydride blends modified with three poly(ether imide)s (PEIs) of different molecular weights was investigated with scanning electron microscopy (SEM) and time-resolved light scattering (TRLS). The morphologies observed by SEM for the three blends were all close to a cocontinuous structure with different periodic distances. The results of TRLS indicated that the phase separation for the PEI-modified epoxy blends took place according to the spinodal decomposition mechanism and the onset time of phase separation, with the periodicity of the phase structure depending on the PEI molecular weight and cure temperature. The time-dependent peak scattering vector was simulated with a Maxwell-type viscoelastic relaxation equation, indicating that the coarsening process of epoxy droplets was mainly controlled by the viscoelastic flow. Relaxation times obtained at different temperatures for the three blends could be described by the Williams-Landel-Ferry equation. The effects of the PEI molecular weight on the processes of viscoelastic phase separation were investigated, and the observed trends could be explained qualitatively through thermodynamic analysis.
机译：用扫描电子显微镜（SEM）和时间分辨光散射（TRLS）研究了用三种不同分子量的聚醚酰亚胺（PEIs）改性的双酚A /甲基四氢邻苯二甲酸酐共混物的二缩水甘油醚的相分离。通过SEM观察到的三种共混物的形态均接近具有不同周期距离的共连续结构。 TRLS的结果表明，PEI改性环氧共混物的相分离是根据旋节线分解机理和相分离的开始时间进行的，相结构的周期性取决于PEI分子量和固化温度。用麦克斯韦型粘弹性弛豫方程模拟了随时间变化的峰值散射矢量，表明环氧液滴的粗化过程主要受粘弹性流控制。三种混合物在不同温度下获得的弛豫时间可以用Williams-Landel-Ferry方程描述。研究了PEI分子量对粘弹性相分离过程的影响，并通过热力学分析定性解释了观察到的趋势。

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