| Abstract: | Silica were introduced to segmented copolyester system (poly(butylene terephthalate)‐poly(ethylene terephthalate‐co‐isophthalate‐co‐sebacate) (PBT‐PETIS)) by in situ polymerization. Investigations on melting behavior and crystalline structure were undertaken, and the dispersion situation of silica in segmented copolyester composites was detected. A diverse crystallization characteristic has been found when the modified Avrami analytical method was applied to investigate nonisothermal crystallization behavior of the composites. Crystallization rate was restricted rather than be promoted by increasing loading of silica. The values of Avrami exponent ranged from 2.25 to 2.45, presenting a mechanism of three‐dimensional spherulitic growth with heterogeneous nucleation. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1052–1058, 2006 |
