UCST and LCST behaviour in polymer blends containing poly(methyl methacrylate-statstyrene)

混溶性 低临界溶液温度 上临界溶液温度 材料科学 高分子化学 共聚物 甲基丙烯酸甲酯 聚苯乙烯 聚合物混合物 浊点 化学工程 聚合物 有机化学 化学 复合材料 水溶液 工程类
作者
T. Sato,Kazutaka Katayama,Tamaki Suzuki,Tomoo Shiomi
出处
期刊:Polymer [Elsevier BV]
卷期号:39 (4): 773-780 被引量:22
标识
DOI:10.1016/s0032-3861(97)00339-x
摘要

Miscibility behaviour was investigated for the blends of homopolymer A with the random copolymer consisting of two components B and C, where the A homopolymer is miscible with homopolymer B but immiscible with homopolymer C. The copolymer employed was poly(methyl methacrylate-stat-styrene) (MMA·S), and the homopolymers were polystyrene (PS), poly(vinyl methyl ether) (PVME), and poly(ethylene oxide) (PEO) or poly(ethylene glycol) (PEG), where PS is immiscible with MMA homopolymer, PVME is miscibel with S but immiscible with MMA, and PEO or PEG is miscible with MMA but immiscible with S. UCST-type miscibility was observed for the PEO/MMA·S blends though the homopolymer blends PEO/PMMA had been reported to be of LCST-type. UCST-type miscibility was found for PS/MMA·S as well. On the other hand, PVME/MMA·S showed LCST-type miscibility with miscibility window-like behaviour. Such contrasting miscibility behaviour, i.e. appearances of UCST and LCST, for a series of MMA·S copolymer blends was discussed on the basis of the Flory-Patterson free volume theory. As a result, it was suggested that contribution of the free volume term decreases for PEO/MMA·S (UCST type), increases for PVME/MMA·S (LCST type) and is little changed for PS/MMA·S (UCST type), compared with that for the respective miscible component pairs, PEO/MMA, PVME/S and PS/S. Furthermore, the Flory-Huggins χ parameters between different components were estimated as a temperature-dependent function from dependence of miscibility on the copolymer composition in these blends. In this estimation, the χ parameters determined for PVME/PS and PEO/PMMA by Han et al. and Ito et al., respectively, using neutron scattering technique were used as a standard. The miscible/immiscible boundaries drawn using the χ parameters obtained reproduced well the experimental results of the dependence of miscibility on the molecular weight as well as on the copolymer composition. Thus, it was shown that the χ parameters for immiscible pairs such as PS/PMMA, PEO/PS and PVME/PMMA can be evaluated by use of the blend type A/B·C dealt with here.
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