期刊
POLYMER
卷 176, 期 -, 页码 227-235出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2019.05.052
关键词
Poly (L-lactic acid) (PLLA); Crystallization; Recrystallization; Crystal nucleation; Self-nucleation
资金
- Deutsche Forschungsgemeinschaft (DFG) [AN 212/20]
- Carbonene Technology Co. Ltd, Sichuan, China
- Ministry of Education and Science of the Russian Federation [14.Y26.31.0019]
The kinetics of melt-recrystallization and the stability of crystal self-nuclei of poly (L-lactic acid) initially containing disordered alpha'-crystals with a melting temperature of around 150 degrees C has been analyzed using specifically designed fast scanning chip calorimetry experiments (FSC). In general, the rate of recrystallization of the melt after complete melting of alpha'-crystals decreases with increasing melt-temperature mainly due to the lowering of the self-nuclei concentration. Self-nuclei of highest stability survive up to about 170 degrees C. The concentration of self-nuclei/alpha'-crystal remnants at a specific melt-temperature between 150 and 170 degrees C is independent on time, that is, only the temperature of the melt controls the self-nuclei content. Combining fast scanning calorimetry with polarized-light optical microscopy and with atomic force microscopy allows studying the semicrystalline morphology of samples of different self-nucleation history, providing direct information about the self-nuclei concentration in the various melts.
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