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Nonisothermal crystallization of poly(ethylene terephthalate) and its blends in the injection‐molding process
Author(s) -
Okamoto Masami,
Shinoda Yoshihiro,
Kinami Nobuyuki,
Okuyama Tomoko
Publication year - 1995
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.1995.070570904
Subject(s) - materials science , crystallization , crystallinity , composite material , polyethylene terephthalate , talc , blow molding , polymer chemistry , molding (decorative) , poly ethylene , isothermal process , ethylene , chemical engineering , mold , thermodynamics , chemistry , biochemistry , physics , engineering , catalysis
Abstract We investigated the nonisothermal crystallization during the cooling process of injection molding of poly(ethylene terephthalate) (PET), PET/talc, and PET/Surlyn blends. We applied the isothermal crystallization parameters obtained by the Hoffman–Lauritzen theory to the kinetics of nonisothermal crystallization and then calculated the relative crystallinity χ/χ c as a function of the mold temperature. χ/χ c were nicely interpreted by calculation without effect of the pressure history on crystallization in PET and PET/talc (1 wt %) blends. In contrast, in the PET/Surlyn (3 wt %) blend, crystallization occurred at a lower mold temperature than predicted by our calculation. The transmission electron micrograph near the surface of the injection‐molded PET/Surlyn blend showed deformation and stretching of dispersed Surlyn particles, suggesting that orientation of the PET matrix proceeds with the flow in processing. The orientation of the PET matrix resulted in acceleration of the crystallization in the injection molding. © 1995 John Wiley & Sons, Inc.