Effect of cryomilling on the thermal behaviors of poly(ethylene terephthalate)

We have studied the effect of cryomilling (high-energy ball milling under cryogenic temperature) on the thermal behaviors of poly(ethylene terephthalate) (PET) by comparing with original PET and quenched PET. Cryomilling induced the amorphization of crystalline PET, but the thermal behaviors of amorphous PET obtained from cryomilling are significantly different to those of amorphous PET obtained from quenching. Unlike amorphous PET obtained from quenching, the heating curve of amorphous PET obtained from cryomilling shows no cold crystallization peak, but evidences are found that its cold crystallization occurs within a wide temperature range. In addition, the stability of amorphous PET obtained from cryomilling is higher than that of amorphous PET obtained from quenching. The difference is proved to be attributed to the stored energy in cryomilled PET. The hot crystallization behaviors of PET improve a lot after cryomilling, and the heat stability of cryomilled PET is also better than those of original PET during reheating. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006

[1]  F. Cavalieri,et al.  High-energy mechanical alloying of thermoplastic polymers in carbon dioxide , 2002 .

[2]  C. Koch,et al.  Anomalous Phase Inversion in Polymer Blends Prepared by Cryogenic Mechanical Alloying , 2001 .

[3]  C. Koch,et al.  Structural changes in poly(ethylene terephthalate) induced by mechanical milling , 2000 .

[4]  A. P. Smith,et al.  High-energy mechanical milling of poly(methyl methacrylate), polyisoprene and poly(ethylene-alt-propylene) , 2000 .

[5]  C. Koch,et al.  Cryogenic Mechanical Alloying of Poly(methyl methacrylate) with Polyisoprene and Poly(ethylene-alt-propylene) , 2000 .

[6]  J. Torkelson,et al.  Novel Strategy for Polymer Blend Compatibilization: Solid-State Shear Pulverization , 2000 .

[7]  E. Cesari,et al.  Effect of milling on the thermal behaviour of poly(ethylene terephthalate) , 1999 .

[8]  J. Pan,et al.  Effects of processing parameters on material properties of mechanically processed polyamide , 1995 .

[9]  G. C. Stevens,et al.  On radiation effects in poly(ethylene terephthalate): a comparison with poly(ether ether ketone) , 1995 .

[10]  T. Ishida.  Mechanical alloying of polytetrafluoroethylene with polyethylene , 1994 .

[11]  W. Shaw.  The role of microsuperplastic flow in high temperature fracture of AL-9021 mechanically alloyed aluminium , 1989 .

[12]  W. F. H. Borman.  Molecular weight–viscosity relationships for poly(1,4‐butylene terephthalate) , 1978 .

[13]  P. Holdsworth,et al.  The melting behaviour of heat crystallized poly(ethylene terephthalate) , 1971 .