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Morphology development and crystallization behavior of a poly(ethylene terephthalate)/polycarbonate blend
Author(s) -
Lee Jong Kwan,
Im Jeong Eun,
Park Jong Hwan,
Won Hong Youn,
Lee Kwang Hee
Publication year - 2005
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.22739
Subject(s) - differential scanning calorimetry , crystallization , materials science , polycarbonate , polymer blend , chemical engineering , miscibility , polymer chemistry , annealing (glass) , glass transition , polymer , spinodal decomposition , transesterification , recrystallization (geology) , composite material , phase (matter) , copolymer , organic chemistry , thermodynamics , chemistry , physics , catalysis , engineering , paleontology , biology
The morphology development and crystallization behavior of an extruded poly(ethylene terephthalate)/polycarbonate blend were studied with optical microscopy, light scattering, and differential scanning calorimetry (DSC). During annealing at 280°C, liquid–liquid phase separation via spinodal decomposition proceeded in a melt‐extruded specimen. After the formation of the domain structure, the blend slowly underwent phase homogenization by transesterification between the two polymers. The specimen, annealed for various times ( t s 's) at 280°C, was subjected to a temperature drop to 180°C for the isothermal crystallization, and then the effects of liquid‐phase changes on crystallization were investigated. The crystal growth rate decreased with t s . The slow crystallization with a large t s value was associated with the composition change of the separated phases and the change of the sequence distribution in the polymer chains during annealing. The influence of t s on the endothermic behavior of the samples was examined. As t s increased, the recrystallization rate was retarded during the DSC scan, displaying multiendothermic behavior. The DSC data also suggested that the increased level of transesterification would give rise to a higher number of species being rejected from the primary crystals, leading to enhanced secondary crystallization. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006