冷结晶温度对注塑成型聚乳酸热性能的影响  

Effect of Cold Crystallization Temperature on Thermal Properties of Injection Molded Polylactic Acid

作　　者：李铭[1] 焦铁果[1] 王亚明[1] 申长雨[1] 

机构地区：[1]郑州大学橡塑模具工程研究中心材料成型及模具教育部重点实验室,河南郑州45000

出　　处：《塑料科技》2011年第5期84-87,共4页Plastics Science and Technology

基　　金：国家自然科学基金(50873094;10590350);郑州大学优秀博士论文培育基金

摘　　要：采用DSC、DMA和WAXD研究了冷结晶温度对注塑成型聚乳酸(PLA)热性能、动态黏弹性及微观结构的影响。结果表明:冷结晶之后,PLA的耐热性能和结晶度有了大幅度提高,且随冷结晶温度的升高而增加;在玻璃化转变温度以上,PLA试样仍然具有较好的弹性和黏性。WAXD结果表明:随冷结晶温度的改变,PLA试样可以得到α'晶和α晶。The effects of thermal properties,dynamic viscoelastic property and microstructure of injection molded polylactic acid were investigated by DSC,DMA and WAXD.The results show that： the degree of crystallinity of the cold crystallized PLA is improved significantly,increasing with the increase of temperature;above the glass transition temperature,the flexibility and viscosity of the cold crystallized PLA are still held high values.The results of WAXD show that with the increase of temperature,PLA crystallizes as α＇-form and α-form.

关 键 词：聚乳酸 热性能 冷结晶 热变形温度 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]