CROSS-POLYMERIZATION OF POLY(ALPHA,OMEGA-ALKYLDIYNE) MACROMONOMERS

被引:11
作者
BUTERA, RJ
SIMICGLAVASKI, B
LANDO, JB
机构
[1] CASE WESTERN RESERVE UNIV,DEPT MACROMOLEC SCI,CLEVELAND,OH 44106
[2] CASE WESTERN RESERVE UNIV,DEPT CHEM,CLEVELAND,OH 44106
关键词
D O I
10.1021/ma00203a035
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 solid-state cross-polymerization reactions of several poly(α,ω-alkyldiyne) macromonomers [formula-omited], (where n = 3, 5, and 8) were characterized. UV-vis and resonance Raman spectra were recorded as a function of conversion, and the results show that a broad distribution of conjugation lengths is present in the partially cross-polymerized macromonomers. Results from samples in which the cross-polymerization was initiated with UV light were compared with those obtained by using samples that were thermally initiated. It was found that the distribution of conjugation lengths is probably caused by constraints imposed upon the growing poly(diacetylene) (PDA) chains by the crystallite size distribution and the crystallite defect density distribution of the sample as well as by UV-induced chain degradation (for those samples that were initiated with UV light). Resonance Raman spectra of the three macromonomer systems investigated show that the low-frequency bands are mixed modes that are primarily due to motions of the aliphatic spacer groups. The intensity behavior of the 720 and 1211 cm-1 bands indicates that a structural change takes place in the aliphatic side chains after about 1 min of UV exposure. © 1990, American Chemical Society. All rights reserved.
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页码:199 / 210
页数:12
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