The crystallization behaviour of the poly(ethylene terephthalate-co-l,4-cyclohexylene dimethylene terephthalate) (P(ET/CT)) random copolyesters is studied by d.s.c, analysis. ET units can crystallize with complete rejection of the CT units from the crystals, whereas CT units can co-crystallize with incorporation of ET units to some extent, resulting in a minimum melting temperature at an intermediate composition of about 30--40 mol% CT. A good linear relation is found between the compositions at which the melting point exhibits a minimum experimentally in various random copolyesters and those at which the cohesive energies for two components estimated by group contribution methods are identical.
Посилання на статтю:
Co-crystallization behaviour and melting-point depression in poly(ethylene terephthalate-co-1,4-cyclohexylene dimethylene terephthalate) random copolyesters / Hee Yeoul Yoo, Susumu Umemoto, Takeshi Kikutani and Norimasa Okui // Polymer. – 1994. – Vol 35. – P. 117-122.