Effects of wood fiber content on structure and properties of WF/PLA bio-composites

被引:1
|
作者
Guo, Wen-jing [1 ]
Bao, Fu-cheng [1 ]
Wang, Zheng [1 ]
Chang, Liang [1 ]
Gao, Li [1 ]
机构
[1] Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China
来源
HIGH PERFORMANCE STRUCTURES AND MATERIALS ENGINEERING, PTS 1 AND 2 | 2011年 / 217-218卷
关键词
WF/PLA composites; wood fiber content; mechanical properties; thermal properties; Molecular weight; POLYLACTIDE; PLA;
D O I
10.4028/www.scientific.net/AMR.217-218.606
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This study is devoted to investigate the effects of wood fiber content on structure and properties of wood fiber /poly(lactic acid) bio-composites (WF/PLA bio-composites). The WF/PLA bio-composites with WF from 30% to 60% and from 70% to 90% were prepared using melt extrusion and high-speed mixing methods respectively. The physical, mechanical, thermal, and macromolecular properties of WF/PLA bio-composites were evaluated. The results are as follows: Density of WF/PLA bio-composites increased when WF increased from 30% to 60%, and decreased when WF increased from 70% to 90%. Water resistance of bio-composite decreased with increasing WF content. The flexural strength of WF/PLA bio-composites were lowered when adding WF into PLA. The flexural strength decreased when WF increased from 30% to 50%, and then increased when WF increased from 60% to 80%. The flexural modulus of the bio-composite was higher than that of PLA without WF. Both (M) over bar (n) and (M) over bar (w) of PLA in WF/PLA bio-composite were decreased more than 70% with WF increased. The T-g, T-m values of PLA in the bio-composites were decreased with the WF increased. The cold crystal temperature (T-cc) was decreased with WF increased at low WF content. All the property changes were related to the decreasing of molecular weight of PLA in WF/PLA bio-composites.
引用
收藏
页码:606 / 613
页数:8
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