期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 82, 期 5, 页码 1291-1298出版社
JOHN WILEY & SONS INC
DOI: 10.1002/app.1963
关键词
poly(vinyl alcohol); infrared spectroscopy; NMR; syndiotactic; degree of crystallization
The influence of the degree of crystallinity and the syndiotacticity on the 1145, 1095, and 916 cm(-1) bands was studied. The intensity of the 1145 cm(-1) band increased with increasing syndiotacticity at a low degree of crystallinity and with an increasing degree of crystallinity for a sample with syndiotacticity. The intensity of 1095 cm(-1) band increased with increasing syndiotacticity at a fixed degree of crystallinity and was independent of the degree of crystallinity for a sample. The intermolecular hydrogen bonds were found to play an important role. The differences of the relations between the absorbance ratio D-1145/D-1095 and the degree of crystallinity with syndiotacticity were explained. The extent of the decrease of the intensity of 916 cm(-1) band with an increasing degree of crystallinity increased with decreasing syndiotacticity. The predominant introduction of syndiotactic sequences in the crystals was assumed in the lower syndiotacticity. The improved equation between the syndiotactic diad content in percent [s-(diad) %] and the absorbance ratio D-916/D-849 was established as s-(diad) % = 71.1 X (D-916/D-849)(0.327) for the films heated at 50 degreesC with use of a syndiotactic. diad content obtained from NMR spectra. (C) 2001 John Wiley & Sons, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据