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Amorphous copolyesters based on 1,3/1,4‐cyclohexanedimethanol: Synthesis, characterization and properties
Author(s) -
Tsai Yuhsin,
Fan ChengHsing,
Hung ChiYuan,
Tsai FuuJen
Publication year - 2008
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.28385
Subject(s) - materials science , terephthalic acid , amorphous solid , copolymer , polymer chemistry , dimethyl terephthalate , ultimate tensile strength , polymer , succinic acid , ethylene glycol , condensation polymer , polyester , composite material , organic chemistry , chemistry
Abstract Two series of amorphous copolyesters, PETGN and PETGS, were synthesized by the copolymerization of 2,6‐naphthalene dicarboxylic acid (NDA) (0–40%), succinic acid (SA) (0–40%), 1,3/1,4‐cyclohexanedimethanol (1,3/1,4‐CHDM) (10–50%), ethylene glycol (EG), and terephthalic acid (TPA). The compositions and molecular weights of the copolyesters were determined by 1 H NMR spectroscopy and viscometry, respectively. The thermal behaviors were studied over the entire range of copolymer compositions, using DSC and TGA. The optical characteristics, heat‐shrinkable effects and tensile properties of these polymers were also determined. Experimental results indicated that the thermal, optical, tensile, and shrinkage properties of PETGN and PETGS were functions of NDA or SA content. DSC and X‐ray analysis demonstrated that both PETGN and PETGS series were amorphous. Incorporating NDA and SA influenced the T g values of those polymers, from about 37°C for PETG 30 S 40 to 89°C for PETG 30 N 40 . Furthermore, the shrinkage of these amorphous copolyesters was more than 40% when the heating temperature was higher than the corresponding T g . © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008