Higher order structural analysis of stereocomplex-type poly(lactic acid) melt-spun fibers

被引：59

作者：

Furuhashi, Yukiko

Kimura, Yoshiharu

Yamane, Hideki ^{[1
]}

机构：

[1] Kyoto Inst Technol, R&D Ctr Biobased Mat, Sakyo Ku, Kyoto 6068585, Japan

[2] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2007年 / 45卷 / 02期

关键词：

crystal structures; crystalline orientation; fibers; higher order structures; poly(lactic acid); stereocomplexes; wide-angle X-ray diffraction (WAXD);

D O I：

10.1002/polb.21035

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 higher order structure of stereocomplex-type poly(lactic acid) melt-spun fibers of an equimolar blend Of poly(L-lactic acid) and poly(D-lactic acid) was analyzed with wide-angle X-ray diffraction (WAXD) and birefringence measurements. Two different crystalline structures were observed in the fibers: alpha-form homocrystals and stereocomplex crystals. The weight fractions of the two crystals were estimated with the WAXD integrated intensity data. The crystalline orientation factors were obtained from the WAXD measurements. Well-oriented homocrystals formed during a drawing process at the crystallization temperature of the homocrystal. Drawing above this temperature caused the stereocomplex crystal to be formed. The crystalline orientation tended to be lower with increasing drawing temperatures. Through the combination of the intrinsic birefringence and the fractions of the a-form. homocrystals and stereocomplex crystals, the birefringence of the amorphous phase was evaluated. The amorphous birefringence stayed positive and decreased with increasing drawing temperature. (c) 2006 Wiley Periodicals, Inc.

引用

页码：218 / 228

页数：11

共 43 条

[1] Investigation of the poly(L-lactide)/poly(D-lactide) stereocomplex at the air-water interface by polarization modulation infrared reflection absorption spectroscopy [J].