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Studies on second harmonic generation efficiency by a series of chiral polyesters
Author(s) -
Philip Biju,
Sreekumar K.
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12477
Subject(s) - polyester , chromophore , condensation polymer , terephthaloyl chloride , materials science , second harmonic generation , polymer , glass transition , tartrate , polyamide , thermal stability , polymer chemistry , chemical engineering , chemistry , organic chemistry , composite material , optics , physics , laser , engineering
A series of optically active main‐chain polyesters were synthesized by high‐temperature polycondensation from biphenolic azo chromophores, (2R,3R)‐(+)‐diethyl tartrate and terephthaloyl chloride. The polyesters showed glass transition temperatures in the range of 100–135°C and were thermally stable to 350°C. The second harmonic generation efficiency of the polyesters was studied by the powder method and as thin films with 2‐methyl‐4‐nitroaniline as a reference. The SHG efficiency of the polymers was compared with that of low molecular weight chromophores. The polymers with chiral units showed good second harmonic generation efficiency. The SH signal also showed good temporal stability. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 11: 2468–2473, 2003