期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 27, 期 5, 页码 361-365出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200500669
关键词
azo polymers; degree of polymerization (DP); liquid-crystal line polymers (LCP); photoinduced birefringence
The evolution of the photoinduced birefringence in thin films of narrow polymer fractions is studied and compared with the behavior of the non-fractionated polymer. The Delta n(ind) value decreases by increasing the degree of polymerization (DP) within the oligomeric range but becomes independent of molecular weight starting from a DP of approximate to 70. Thermal pretreatment of the films results in higher photoinduced birefringence. The films show good stability of the photorecording.
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