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Sequence distribution, thermal properties, and crystallization studies of poly(trimethylene terephthalate‐ co ‐1,4‐cyclohexylene dimethylene terephthalate) copolyesters
Author(s) -
Yang Jian,
Li Wengang,
Yu Aifang,
Xi Peng,
Huang Xiang'an,
Li Suming
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.29340
Subject(s) - materials science , dimethyl terephthalate , crystallization , comonomer , thermal stability , polymer chemistry , copolyester , condensation polymer , thermal decomposition , differential scanning calorimetry , polymer , copolymer , polyester , composite material , organic chemistry , chemistry , thermodynamics , physics
A series of novel poly(trimethylene terephthalate‐ co ‐1,4‐cyclohexylene dimethylene terephthalate) (PTCT) with various compositions were synthesized by melt polycondensation of 1,3‐propanediol, 1,4‐cyclohexanedimethanol and dimethyl terephthalate. The resulting copolyesters were characterized using 13 C and 1 H nuclear magnetic resonance. The average length of both trimethylene terephthalate (TT) and cyclohexylene dimethylene terephthalate (CT) sequences varies from 1 to 10, and the chain structure is statistically random. The crystallization was investigated using wide angle X‐ray diffractometer (WAXD) and differential scanning calorimeter. The WAXD patterns can be divided in two groups according to the composition: copolyesters with less than 35 mol % CT content exhibit PTT‐type lattice, and those with CT unit content higher than 42 mol % crystallize with the PCT‐type lattice. The crystallizability of CT sequence is higher than that of TT sequence. Thermodynamic analysis shows that the comonomer is excluded from the PTT‐type or PCT‐type crystal of the copolyesters. The thermal decomposition temperature of copolyesters increases with increasing CT content, and their thermal stability is improved as compared to that of PTT. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009