期刊
POLYMER
卷 52, 期 22, 页码 5156-5165出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.09.007
关键词
Polyamide 6; Crystallization; Fast scanning chip calorimetry
资金
- Deutsche Forschungsgemeinschaft (DFG)
Fast scanning chip calorimetry has been employed to explore the kinetics of structure formation of polyamide 6 from the glassy state. First, the condition to obtain fully amorphous polyamide 6 has been evaluated. It was found that ordering processes are only permitted on cooling the relaxed melt slower than about 150 Ks(-1); faster cooling was connected with complete vitrification of the supercooled liquid. Cold-ordering of fully amorphous, non-aged samples on continuous heating only takes place if the heating rate is lower than 500 Ks(-1). Isothermal cold-ordering experiments of fully amorphous samples have been performed in a wide temperature range between 330 and 470 K, in order to obtain for the first time a complete relationship between half-time of cold-ordering/crystallization and temperature. The study was completed by an initial discussion of the temperature dependence of the mechanism of nucleation and of the effect of the crystal/mesophase polymorphism on the transition kinetics. (C) 2011 Elsevier Ltd. All rights reserved.
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