Segregation of a random copolymer from miscible blends

被引：9
作者：
Pellegrini, NN
Sikka, M
Satija, SK
Winey, KI
机构：
[1] UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104
[2] UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104
[3] UNIV PENN,DEPT CHEM ENGN,PHILADELPHIA,PA 19104
[4] NIST,CTR NEUTRON RES,GAITHERSBURG,MD 20899
来源：
MACROMOLECULES | 1997年 / 30卷 / 21期
关键词：
D O I：
10.1021/ma970586i
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Thin film bilayers of deuterated polystyrene (dPS) and blends of deuterated poly(methyl methacrylate) (dPMMA) with a compositionally symmetric random copolymer of styrene and methyl methacrylate (P[S-0.49-ran-MMA]) were investigated by neutron reflectivity. Copolymer segregation to the free surface occurs upon spin-coating blends onto silicon substrates. Annealing the bilayers to equilibrium at 150 degrees C increases the segregation of the copolymer from the blend layers to the interface with dPS. Blends containing 5 and 10 vol % copolymer both exhibit this segregation behavior. For these blend compositions the interfacial segregation of copolymer from the miscible blends is insufficient to form a discrete layer. These results suggest that this random copolymer would be an interfacial specific additive.
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收藏
页码：6640 / 6644
页数：5
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