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Synthesis and properties of poly(alkylene p,p ′‐bibenzoate‐ co ‐adipate)s
Author(s) -
Lee DaKong,
Tsai HongBing
Publication year - 1997
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/(sici)1097-4628(19970801)65:5<893::aid-app6>3.0.co;2-i
Subject(s) - adipate , crystallinity , materials science , polymer chemistry , adipic acid , condensation polymer , copolymer , glass transition , polymer , melting point , tacticity , crystallography , polymerization , chemistry , composite material
Various poly(alkylene p,p ′‐bibenzoate‐ co ‐adipate)s were prepared by melt polycondensation of dimethyl‐ p,p ′‐bibenzoate, adipic acid, and an alkylene glycol. The copolyesters were characterized by inherent viscosity, FTIR, proton NMR, DSC, polarized microscopy, and X‐ray diffraction. The polymer composition and sequence distribution of the copolyesters can be seen from NMR spectra. The copolyesters exhibit a degree of randomness of about 1, indicating that they are random copolymers. From the DSC data, the glass transition temperature ( T g ) and melting point ( T m ) of the copolyesters can be detected. When the content of the flexible adipate unit increases, the T g of copolyesters decreases significantly. The type of alkylene glycol used also affects the T g to some extent. The copolymerization effect decreases crystallinity and the T m of the copolyesters. The DSC, polarized microscopy, and X‐ray diffraction data show that some copolyesters derived from 1,6‐hexanediol exhibit a monotropic smectic phase. As the molar fraction of adipate unit in diacid units, x , is more than 0.4, the liquid crystallinity is completely destroyed. © 1997 John Wiley & Sons, Inc. J Appl Polm Sci 65:893–900, 1997