Phase behaviour of blends of homopolymers with α-methylstyrene/acrylonitrile copolymers

Phase behaviour of blends of homopolymers with α-methylstyrene/acrylonitrile copolymers
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DOI：
10.1016/0032-3861(94)90350-6
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发表时间：
1994-03
期刊：
Polymer
影响因子：
4.6
通讯作者：
P. P. Gan-P.;D. R. Paul;A. Padwa
P. P. Gan-P.;D. R. Paul;A. Padwa
中科院分区：
化学2区
文献类型：
--
作者：
P. P. Gan-P.;D. R. Paul;A. Padwa

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本文详细研究了α-甲基苯乙烯/丙烯腈共聚物（α-MSAN）与聚甲基丙烯酸甲酯（PMMA）、四甲基双酚A聚碳酸酯（TMPC）、聚氯乙烯（PVC）、聚2,6-二甲基-1,4-苯乙烯氧化物（PPO）、聚（ϵ-caprolactone） （PCL）和双酚A聚碳酸酯（PC）共混物的相行为，并将其与苯乙烯/丙烯腈共聚物（SAN）共混物的相行为进行了比较。α-甲基苯乙烯取代苯乙烯扩大了与PMMA和PVC的混相窗口，但缩小了与TMPC的混相窗口。此外，α-MSAN与PVC共混体系的相分离温度较高，而PMMA和TMPC的相分离温度较低。PPO、PCL和PC均不能与α-MSAN共聚物相混。利用Sanchez和Lacombe的晶格流体理论，尽可能从较低临界溶液温度型相边界出发，对这些体系的相互作用参数进行了评估。用二元相互作用模型推导了共聚物各单体单元对之间的相互作用。得到的交互参数可以从一个系统转换到另一个系统。结果讨论了单体单位对之间的相互作用和状态方程或压缩性效应。
This paper examines in detail the phase behaviour of blends of α-methylstyrene/acrylonitrile copolymers (α-MSAN) with poly(methyl methacrylate) (PMMA), tetramethylbisphenol A polycarbonate (TMPC), poly(vinyl chloride) (PVC), poly(2,6-dimethyl-1,4-phenylene oxide) (PPO), poly(ϵ-caprolactone) (PCL) and bisphenol A polycarbonate (PC), and compares these with the corresponding behaviour of blends based on styrene/acrylonitrile copolymers (SAN). Replacement of styrene with α-methylstyrene widens the miscibility window with PMMA and PVC but narrows the miscibility window with TMPC. In addition, the phase separation temperatures for α-MSAN blends with PVC are higher while those with PMMA and TMPC are lower compared to similar SAN-based blends. PPO, PCL and PC were found to be not miscible with any of the α-MSAN copolymers. Interaction parameters for these systems were evaluated where possible from their lower critical solution temperature type phase boundary using the lattice fluid theory of Sanchez and Lacombe. The interactions between various monomer unit pairs were deduced using a binary interaction model for copolymers. The interaction parameters obtained are translatable from one system to another. The results are discussed in terms of interactions between monomer unit pairs and equation-of-state or compressibility effects.