Chain conformation effects on molecular motions at the surface of poly(methyl methacrylate) films

被引：31
|
作者：
Fujii, Yoshihisa [1 ]
Akabori, Kei-Ichi [1 ]
Tanaka, Keiji [1 ]
Nagamura, Toshihiko [1 ]
机构：
[1] Kyushu Univ, Fac Engn, Dept Appl Chem, Nishi Ku, Fukuoka 8190395, Japan
来源：
POLYMER JOURNAL | 2007年 / 39卷 / 09期
关键词：
surface relaxation; poly(methyl methacrylate); tacticity;
D O I：
10.1295/polymj.PJ2006270
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Surface relaxation in syndiotactic (st-) and isotactic (it-) poly(methyl methacrylate) (PMMA) films was studied by lateral force microscopy. The alpha(a)- and beta-relaxation processes were clearly observed even at the surface, permitting us to deduce the form of the dispersion map for the surface relaxation processes. Both relaxation temperatures at the surface were lower than the corresponding ones in the bulk. In addition, the extent to which the peak temperature for the surface relaxation processes fell below that of the bulk strongly depended on the stereoregularity of the films. The differences in the chain conformations between the surface and the bulk, which were more remarkable in the st-PMMA, produced this variation in surface mobility.
引用
收藏
页码：928 / 934
页数：7
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