New approach to the double melting peak of poly(L-lactic acid) observed by DSC

被引:38
|
作者
Gracia-Fernandez, Carlos A. [3 ]
Gomez-Barreiro, Silvia [2 ]
Lopez-Beceiro, Jorge [1 ]
Naya, Salvador [1 ]
Artiaga, Ramon [1 ]
机构
[1] Univ A Coruna, Higher Polytech Sch, Campus Esteiro, Ferrol 15403, Spain
[2] Univ Coll Dublin, CESUGA, Dept Appl Phys, La Coruna 15190, Spain
[3] TA Instruments Waters Cromatog, Thermal Anal, Rheol & Microcalorimetry Applicat, Alcobendas Madrid 28108, Spain
关键词
GLASS-TRANSITION REGION; X-RAY; POLY(LACTIC ACID); CRYSTALLIZATION; BEHAVIOR; POLY(ETHERETHERKETONE); COPOLYMERS;
D O I
10.1557/jmr.2012.57
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Poly(L-lactic acid) (PLLA) is one of the most studied biopolymers nowadays. Due to its good performance, it constitutes an alternative to petrochemical-derived polymers. It was largely studied by differential scanning calorimetry (DSC) and temperature-modulated DSC. Nevertheless, there is an ongoing debate of what happens at the overlapping melting processes. In the present work, the experimental setups are discussed. Different modulation conditions are proposed for the study of the glass transition, cold crystallization, and the two reported melting processes. Finally, the experimental results allowed to measure the heat capacity change at the cold crystallization and a correct interpretation of what happens at the reported double melting peak of PLLA, which involves the existence of three crystalline structures.
引用
收藏
页码:1379 / 1382
页数:4
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