丙烯腈
甲基丙烯酸甲酯
材料科学
相(物质)
高分子化学
混溶性
苯乙烯
动力学
聚甲基丙烯酸甲酯
聚合物混合物
流变学
化学工程
扩散
聚合物
复合材料
共聚物
热力学
化学
有机化学
工程类
物理
量子力学
作者
Xiaolian Jiang,Yajiang Huang,Tian Xia,Han-Qing Yu,Guangxian Li
标识
DOI:10.1080/00222348.2015.1084577
摘要
The influence of molecular weight of poly (methyl methacrylate) (PMMA) on the thermodynamics and dynamics of phase separation in PMMA/poly (styrene-co-acrylonitrile) (SAN) blends was investigated via optical microscopy, time-resolved small-angle light scattering (SALS), and dynamic rheological measurements. It was found that the cloud point temperature of the blends decreased with an increase in the molecular weight of the PMMA. The phase separation rates of PMMA 48K/SAN and PMMA 85K/SAN blends with the near-critical composition were almost the same at small quench depths due to the limited mobility of molecular chains at low temperatures. However, an unexpected phase separation dynamics was observed at larger quench depths. Not only the morphology evolution but also the apparent diffusion coefficient Dapp calculated from SALS revealed that the phase separation rate was faster in the PMMA 85K/SAN blend than in the PMMA 48K/SAN blend. The possible reasons for this unusual rapid kinetics of phase separation...
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