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Effect of Molecular Weight on Photoinduced Birefringence in a Chiral Liquid Crystalline Azodye Polymer
Author(s) -
Kozlovsky Mikhail,
Lazarev Vladimir V.
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500669
Subject(s) - birefringence , polymer , thermal stability , materials science , degree of polymerization , polymerization , polymer chemistry , optics , chemistry , organic chemistry , composite material , physics
Abstract Summary: 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 Δ n ind value decreases by increasing the degree of polymerization ( $\overline {DP}$ ) within the oligomeric range but becomes independent of molecular weight starting from a $\overline {DP}$ of ≈70. Thermal pretreatment of the films results in higher photoinduced birefringence. The films show good stability of the photorecording.Birefringence induced after 10 min, Δ n ind (600) and its growth rate at the same moment versus molecular weight.