聚乳酸/蒙脱土纳米复合材料的冷结晶及熔融行为  

Cold Crystallization and Melt Behavior of Polylactide/Montmorillonite Nanocomposites

作　　者：吴亮[1] 吴德峰[1] 吴兰峰[1] 张明[1] 

机构地区：[1]扬州大学化学化工学院,江苏扬州225002

出　　处：《高分子材料科学与工程》2007年第5期124-127,共4页Polymer Materials Science & Engineering

基　　金：江苏省物理化学重点学科开放基金

摘　　要：采用熔融插层法制备了插层型的聚乳酸/蒙脱土纳米复合材料(PLA/MMTs)。利用差示扫描量热仪(DSC)和X射线衍射(XRD)对该纳米复合材料的结晶及熔融行为进行了研究。结果表明,PLA/MMTs复合体系不能从熔体冷却结晶,但可在较慢的升温过程中固态下冷结晶;蒙脱土不会改变PLA基体结晶的α晶型,但具有异相成核作用,促进了PLA基体的冷结晶在更低的温度下进行;复合体系在较慢升温速率下的双重熔融现象源于原始晶粒熔融重结晶行为。Polylactide/montmorillonite nanocomposites （PLA/MMTs） were prepared by the melt intercalation. The crystallization and melting behavior of both the pure PLA and PLA/ MMTs were characterized by DSC and XRD measurements. The results show that PLA/MMTs and PLA can not crystallize when cooled from melt state, while can crystallize in solid state in heating process. The addition of montmorillonite will not change the crystalline structure of PLA, but can promote cold crystallization of PLA matrix due to the nucleation effect by the clay tactoids. Moreover, the double melting behavior is attributable to recrystallization of those defec- tive crystalline grains.

关 键 词：聚乳酸 蒙脱土 纳米复合材料 冷结晶 熔融 

分 类 号：TB383[一般工业技术—材料科学与工程]