Thermal Properties of Poly(trimethylene terephthalate-co-trimethylene isophthalate)s

摘要: Poly(trimethylene terephthalate-co-trimethylene isophthalate) [P(TT-co-TI)] copolymers with various contents of TI unit were synthesized via a two-step process transesterification and polycondensation in high pressure reactor order to modify the thermal properties PTT. Effects content on crystallization other investigated by DSC, TGA, polarizing microscope, synchrotron WAXD analysis. DSC analysis indicated that cold temperature () increased glass transition melting decreased increasing copolymer. The radial growth rate PTT spherulite formed during decrease melt-crystallization as increases. crystallite also analyzed in-situ patterns. A both heating cooling for P(TT-co-TI)s confirmed Although incorporation non-crystallizing comonomer into crystalline body reduced PTT, it did not affect formation crystal structure Isothermal TGA revealed activation energy isothermal degradation weight loss up 10% was 200~240 kJ/mol, depending