拉伸对聚左旋乳酸结晶的影响  

Influence of Stretching on Crystallization Behavior of Poly(L-lactic acid)

作　　者：邢倩[1,2] 张秀芹[1] 罗发亮[1,2,3] 刘国明[1,2] 王笃金[1] 

机构地区：[1]中国科学院化学研究所,工程塑料重点实验室,北京分子科学国家实验室,北京100190 [2]中国科学院研究生院,北京100049 [3]宁夏大学宁夏能源化工自治区重点实验室,银川750021

出　　处：《高等学校化学学报》2011年第4期971-977,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50925313,50873112)资助

摘　　要：采用红外光谱、差示扫描量热分析及X射线衍射等方法研究了在不同温度下拉伸对聚左旋乳酸(PLLA)结晶行为的影响.结果表明,在合适的温度条件下,拉伸能迅速提高PLLA的结晶速度和结晶度.对经过拉伸预处理但未结晶的PLLA样品进行等温及非等温结晶的研究发现,经过拉伸预处理的PLLA样品的结晶速率和结晶度都得到提高,表明预拉伸会影响PLLA在后续过程中的结晶行为.The influence of stretching under different temperatures on the crystallization behavior of poly（L-lactic acid）（PLLA） was investigated by the combinational investigation of FTIR,DSC,and XRD.It was found that stretching could remarkably improve the crystallization rate and crystallinity of PLLA films.Stretched at a draw ratio of 3,PLLA forms α-form crystals in the temperature range of 90-95 ℃.Further increasing the draw ratio,the crystallinity remains almost constant.With increasing the stretching temperature up to 105 ℃,the PLLA films cannot crystallize under stretching.Contrary to the unstretched PLLA film,the stretched PLLA films gradually crystallize during the heating process,indicating that pre-stretching can change the crystallization behavior of PLLA.

关 键 词：聚左旋乳酸(PLLA) 拉伸 结晶 

分 类 号：O631[理学—高分子化学]