Unusual Phase Separation Kinetics in Poly(Methyl Methacrylate)/Poly(Styrene-co-Acrylonitrile) (PMMA/SAN) Blends with PMMA of Different Molecular Weights

被引：2
作者：
Jiang, Xiaolian [1 ]
Huang, Yajiang [1 ]
Xia, Tian [1 ]
Yang, Qi [1 ]
Li, Guangxian [1 ]
机构：
[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn China, Chengdu 610065, Peoples R China
来源：
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS | 2015年 / 54卷 / 10期
基金：
中国国家自然科学基金;
关键词：
molecular weight; phase behavior; PMMA/SAN blend; SPINODAL DECOMPOSITION; SHEAR-FLOW; DYNAMICS; BEHAVIOR; METHACRYLATE); RHEOLOGY; FLUCTUATIONS; ENTANGLEMENT; DEPENDENCE; MORPHOLOGY;
D O I：
10.1080/00222348.2015.1084577
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
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 D-app 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 observed in the higher molecular weight blend were discussed in terms of molecular mobility and viscoelasticity.
引用
收藏
页码：1233 / 1247
页数：15
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