Order, disorder, and composition fluctuation effects in low molar mass hydrocarbon-poly(dimethylsiloxane) diblock copolymers

被引:73
作者
Almdal, K
Mortensen, K
Ryan, AJ
Bates, FS
机构
[1] UMIST,MANCHESTER MAT SCI CTR,MANCHESTER M1 7HS,LANCS,ENGLAND
[2] CCLRC DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND
[3] UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55405
关键词
D O I
10.1021/ma960437k
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Four block copolymer melts-two poly(isoprene-bloch-dimethylsiloxane) (PI-PDMS) and two poly(ethylene-alt-propylene-block-dimethylsiloxane) (PEP-PDMS)-have been investigated through rheological measurements, SANS, and SAXS. In both systems, lamellar to disorder and <Ia(3)over bar d> bicontinuous to disorder transitions have been observed. Upon heating, the sequence of phases lamellae, modified layers, bicontinuous <Ia(3)over bar d>, disorder is observed in the f = 0.65 PEP-PDMS sample. Composition fluctuations dominate the disordered state properties over an unprecedented wide temperature window in the f = 0.49 PEP-PDMS sample. The fluctuations are evident both in SANS measurements and through the temperature dependence of the viscosity. The phase behavior of these relatively low molar mass block copolymer melts, which range from 6 to 10 kg/mol, is qualitatively anticipated by the trends reported earlier for progressively lower molar mass diblock copolymers.
引用
收藏
页码:5940 / 5947
页数:8
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