滑石粉对PLA/PBAT共混物非等温结晶行为的影响  

Influence of Talc on Nonisothermal Crystallization Behaviors of PLA/PBAT Blends

作　　者：黄秀龙 张华 季欣[1] 宋子健 鲁雪莉 庞素娟[1] 徐鼐[1] 潘莉莎[1] 黎坛 Huang Xiulong;Zhang Hua;Ji xin;Song Zijian;Lu Xueli;Pang Sujuan;Xu Nai;Pan Lisha;Li Tan(School of Materials and Chemical Engineering,Hainan University,Haikou 570228,China;National ＆ Local Joint Engineering ＆ Research Center,Shiner Industrial Co.,Ltd.,Haikou 570125,China)

机构地区：[1]海南大学材料与化工学院,海南海口570228 [2]海南赛诺实业有限公司、功能薄膜国家地方联合工程研究中心,海南海口570125

出　　处：《塑料科技》2018年第10期45-50,共6页Plastics Science and Technology

基　　金：海南省产学研一体化专项项目(cxy20150023);国家自然科学基金项目地区科学基金(51663010,51263007)

摘　　要：采用差示扫描量热法研究了滑石粉（Talc）对聚乳酸/聚己二酸-对苯二甲酸丁二醇酯（PLA/PBAT）共混物非等温结晶行为的影响。结果表明,随着Talc用量的增加,结晶完成时间缩短,结晶温度向高温移动,且结晶度增大,这说明Talc可以起到异相成核剂的作用,显著提高共混物的结晶能力。此外,降温速率对共混物的非等温结晶行为也有显著影响。较低的降温速率有利于得到结晶度更高的PLA/PBAT共混材料。利用Jeziorny法对共混物的非等温结晶动力学进行研究。结果发现,在相同降温速率下,随着Talc含量的增加,结晶速率常数显著增大,而半结晶时间随之减小。在不同降温速率下得到的含Talc共混物的Avrami指数（n）接近3,故其成核机理是以异相成核为主,球晶生长方式为三维生长。Nonisothermal crystallization behaviors of PLA/PBAT were studied by differential scanning calorimetry（DSC）. The results show that, with the increasing Talc content of PLA/PBAT blends, the crystallization time reduces, and the crystallization temperature shifts to higher temperature range. Meanwhile, the crystallinity of the blends also shows an obvious increase. It is confi rmed that Talc makes a strong heterogeneous nucleating effect to enhance the crystallization ability of the PLA/PBAT blends. In addition, cooling rate also has a signifi cant impact on the nonisothermal crystallization behaviors. It is favorable to obtain the PLA/PBAT blend with higher crystallinity under a lower cooling rate. The nonisothermal crystallization kinetics was studied by using Jeziorny method. The results indicate that, at the same cooling rate, crystallization rate constant increases largely, and crystallization half-time decreases with increasing Talc content. Each calculated Avrami index（n） of the blends at diff erent cooling rates is close to 3. It is revealed that the heterogeneous nucleation and 3 D growth are more likely to occur at the presence of Talc.

关 键 词：聚乳酸 聚己二酸-对苯二甲酸丁二醇酯 滑石粉 非等温结晶 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]