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

页码：368 / 372

页数：5

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