Thermal behaviour of poly(lactic acid) in contact with compressed carbon dioxide

被引：39
|
作者：
Yu, Long [1 ,2 ]
Liu, Hongsheng [2 ]
Dean, Katherine
机构：
[1] CSIRO, CMMT, Clayton, Vic, Australia
[2] SCUT, ERCPSP, Ctr Polymers Renewable Resources, Guangzhou 510640, Peoples R China
来源：
POLYMER INTERNATIONAL | 2009年 / 58卷 / 04期
关键词：
PLA; thermal behaviour; carbon dioxide; pressure; annealing; GENERAL CRYSTALLIZATION BEHAVIOR; GLASS-TRANSITION TEMPERATURE; POLY(L-LACTIC ACID); POLYMERS; PLASTICIZATION; EPOXY; POLY(ETHYLENE-TEREPHTHALATE); KINETICS; JUMPS; PLA;
D O I：
10.1002/pi.2540
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
BACKGROUND: The thermal behaviour of poly(lactic acid) (PLA) in contact with compressed CO2 was studied using high-pressure differential scanning calorimetry. In particular, the effect of annealing below and above the glass transition temperature (T-g) on the glass transition, cold crystallization and melting temperatures was studied systematically as a function of annealing time and pressure. RESULTS: The effect of compressed CO2 on the thermal properties of PLA is time dependent. Annealing below T-g decreases the temperature and enthalpy of cold crystallization. Similar, but more evident, behaviours are observed when annealing above T-g. Crystallization temperature and enthalpy during cooling decrease with increasing pressure, and the peak is narrower. CONCLUSION: Annealing PLA in the presence of compressed CO2 accelerates cold crystallization, but retards crystallization during cooling. (C) 2009 Society of Chemical Industry
引用
收藏
页码：368 / 372
页数：5
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