Effect of annealing on fracture mechanism of biodegradable poly(lactic acid)

被引：18
|
作者：
Park, SD [1 ]
Todo, M [1 ]
Arakawa, K [1 ]
机构：
[1] Kyushu Univ, Res Inst Appl Mech, Kasuga, Fukuoka 8168580, Japan
来源：
ADVANCES IN FRACTURE AND FAILURE PREVENTION, PTS 1 AND 2 | 2004年 / 261-263卷
关键词：
biomaterial; annealing; fracture toughness; crack growth behavior; crazing; crystallization; dynamic loading;
D O I：
10.4028/www.scientific.net/KEM.261-263.105
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effect of annealing on the fracture behavior of poly(lactic acid) (PLA) was investigated. Fracture toughness of PLA samples prepared under different annealing conditions was measured under static and dynamic loadings. Microstructure and crack growth behavior were characterized by polarizing microscopy (POM). Crystallinity was determined by DSC analysis. Fracture surface morphology was also studied by scanning electron microscopy. It was shown that the static fracture toughness increased with increase of crystallinity, while the dynamic toughness increased as crystallinity increased. POM exhibited that craze formation played an important role in the fracture mechanism of amorphous samples. Macroscopic fracture toughness and microscopic crack growth mechanism were correlated on the basis of these experimental results, and effect of annealing on the toughness and mechanism were discussed.
引用
收藏
页码：105 / 110
页数：6
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