Time-resolved SAXS study of crystallization of poly(ethylene oxide) poly(methyl methacrylate) blends

被引:29
作者
Baldrian, J
Horky, M
Sikora, A
Steinhart, M
Vlcek, P
Amenitsch, H
Bernstorff, S
机构
[1] Acad Sci Czech Republic, Inst Macromol Chem, CR-16206 Prague 6, Czech Republic
[2] Czech Tech Univ, Fac Nucl Sci & Phys Engn, Prague 18000 8, Czech Republic
[3] Austrian Acad Sci, Inst Biophys & Xray Struct Res, A-8010 Graz, Austria
[4] Sincrotrone Trieste, I-34012 Trieste, Italy
关键词
poly(ethylene oxide)/poly(methyl methacrylate) blends; time-resolved SAXS; isothermal crystallization;
D O I
10.1016/S0032-3861(98)00246-8
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The kinetics of structure development during isothermal melt crystallization in blends containing low-molecular-weight fractions of poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) has been investigated as a function of composition. Time-resolved synchrotron small-angle X-ray scattering, static wide-angle X-ray scattering and differential scanning calorimetry has been used. It has been found that in early stages of crystallization, PEO lamellae of the transient nonintegral folding (NLF) type in a wide range of compositions were formed. Subsequent transformation of MF lamellae into the crystals with one-folded (1F) or extended chains (EC) has occurred through isothermal thinning or thickening. The amorphous PMMA diluent has played a decisive role in structure development. With increasing PMMA content, the induction time prior to crystal formation increased and the rates of NIF, 1F and EC crystallization decreased. Furthermore the recrystallization of the NIF crystals into either 1F or EC crystals was retarded. The addition of PMMA meant that the crystals were growing slowly in a more viscous medium and the retardation effect of the amorphous diluent on the kinetics of these processes resulted in the tendency to create stable and more perfectly ordered structures. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:439 / 445
页数:7
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