捏合温度和木纤维水分对木纤维-聚乳酸复合材料中聚乳酸的影响  

Effect of Kneading Temperature and Wood Fiber Moisture on Properties of Polylactic Acid in Wood Fiber-Polylactic Acid Composite

作　　者：郭文静[1] 王正[1] 鲍甫成[1] 常亮[1] 

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091

出　　处：《林业科学》2010年第3期116-121,共6页Scientia Silvae Sinicae

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(CAFINT2007C02)

摘　　要：采用捏合法制备木纤维-聚乳酸(WF-PLA)复合材料。通过凝胶色谱法(GPC)和差示扫描量热法(DSC)研究捏合温度和木纤维水分对WF-PLA生物质复合材料中聚乳酸分子质量及热性能的影响。结果表明:捏合温度对WF-PLA生物质复合材料中PLA性能影响显著。随着捏合温度由180℃升高到200℃,WF-PLA复合材料中PLA的重均分子质量(M珚w)明显下降,数均分子质量(M珚n)在200℃时也明显下降,在190℃时,PLA分子多分散系数最小。不同捏合温度的WF-PLA复合材料中,PLA熔融温度略有不同,熔融温度变化与PLA分子质量相关。木纤维水分对捏合法制备的WF-PLA复合材料中PLA的分子质量和热性能的影响不显著。Wood fiber-polylactic acid （ WF-PLA） bio-composites were prepared by kneading. The effect of different kneading temperature and wood fiber moisture on molecular weight and thermal properties of polylactic acid（PLA） in WF- PLA composite were analyzed using gel permeation chromatography（ GPC） and differential scanning calorimeter（ DSC）. The result indicates that kneading temperature had a significant effect on the properties of PLA in WF-PLA composite. The weight mean molecular weight（ Mw ） of PLA in WF-PLA composite decreased with kneading temperature increased from 180 ℃ to 200 ℃ . The number mean molecular weight（ Mn） decreased at 200 ℃ only. The molecular polydispersity（PD） of PLA was the lowest at 190 ℃ . The melt temperature and cold crystal temperature were different for WF-PLA composite with different kneading temperature. The change of melt temperature was correlative to the molecular weight of PLA. No marked effect induced by wood fiber moisture to molecular weight and thermal properties of PLA of WF-PLA biocomposite.

关 键 词：WF-PLA复合材料 分子质量 热性能 木纤维水分 聚乳酸 

分 类 号：TQ353.41[化学工程]