Comparison of Melting and Crystallization Behaviors of Polylactide under High-Pressure CO2, N2, and He

被引：7
|
作者：
Nofar, M. [1 ]
Tabatabaei, A. [1 ]
Ameli, A. [1 ]
Park, C. B. [1 ]
机构：
[1] Univ Toronto, Dept Mech & Ind Engn, Microcellular Plast Mfg Lab, Toronto, ON M5S 1A1, Canada
来源：
PROCEEDINGS OF PPS-29: THE 29TH INTERNATIONAL CONFERENCE OF THE POLYMER - CONFERENCE PAPERS | 2014年 / 1593卷
关键词：
Polylactide; crystallization; melting temperature; high-pressure gas; POLY(LACTIC ACID); CARBON-DIOXIDE; EXTENSIONAL STRESSES; GAS; PLA; DIFFUSIVITY; NUCLEATION; SOLUBILITY; MORPHOLOGY; KINETICS;
D O I：
10.1063/1.4873791
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
This study investigated the melting and crystallization behaviors of polylactide (PLA) under high-pressure CO2, N-2, and helium (He) using a high-pressure differential scanning calorimeter. The results showed that the PLA's melting temperature was depressed only in contact with pressurized CO2 where at high CO2 pressures the lubricating gas molecules induced more imperfect melt and cold crystals during the cooling and heating cycles, respectively. PLA's melt crystallization was analyzed during nonisothermal processes. Despite the effect of dissolved CO2 that expedited the PLA's crystallization rate, N-2 showed almost a neutral impact on the PLA's crystallization kinetics. Because of the lower solubility, N-2 gas content dissolved in the PLA had a diminutive plasticization effect, and thereby it could only counterbalance its negative hydraulic pressure effect. Moreover, as the helium pressure increased, the PLA's final crystallinity was reduced due to the dominant effect of helium's hydraulic pressure.
引用
收藏
页码：320 / 323
页数：4
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