Step-scan DSC研究PET/纳米CaCO_3复合材料的结晶和熔融行为  

Crystallization and Melting Behavior of PET/CaCO_3 Nanocomposites Measured by Step-Scan DSC

作　　者：孙莉莉 王群玥 王磊 顾振 郑康 田兴友 

机构地区：[1]中国科学院固体物理研究所材料物理重点实验室,安徽省纳米与技术重点实验室,安徽合肥230031

出　　处：《高分子材料科学与工程》2012年第5期108-112,共5页Polymer Materials Science & Engineering

基　　金：国家科技支撑计划项目(2007BAE22B00)

摘　　要：采用纳米碳酸钙(CaCO3)浆料直接分散于聚对苯二甲酸乙二醇酯(PET)的单体乙二醇中,原位聚合制备出分散均匀的聚对苯二甲酸乙二醇酯(PET)/CaCO3纳米复合材料。分别利用传统的差示扫描量热仪(DSC)和步进扫描DSC(Step-scan DSC)技术研究了CaCO3含量变化对PET结晶和熔融行为的影响及非等温结晶动力学过程。结果表明,纳米粒子与PET的相互作用较弱,对PET结晶主要起促进作用,使结晶更加完善,碳酸钙的含量达到3%时,相对结晶速率达到最大。结晶初期,纳米粒子异相成核作用占优势,这种优势随着纳米粒子含量的增加而有所减弱;结晶后期,纳米粒子对高分子运动的牵制作用比较明显。Calcium carbonate/poly （ethylene terephthalate）（PET） nanocomposites were prepared by in situ polymerization with directly dispersing of nano-CaCO3 in EG. The influence of variation of CaCO3 contents on non- isothermal crystallization and melting behavior of PET and PET nanocomposites were investigated by traditional differential scanning calorimeter （DSC） and step-scan DSC（SDSC）, respectively. The results show that CaCO3 nanopartictes are well-dispersed in the PET matrix and the interactions between PET and nanoparticles are weak. The addition of nanosizecd CaCO3 has a positive effect on the crystallization of PET and makes the crystal more perfect. The non-isothermal crystallization kinetic study indicates that CaCO3 has a heterogeneous nucleation effect at the beginning of crystallization of PET, while the constraint effect of the nanoparticles plays a major role during late stage of non-isothermal crystallization.

关 键 词：聚对苯二甲酸乙二醇酯 纳米碳酸钙 非等温结晶 熔融 步进扫描差热分析 

分 类 号：TB383[一般工业技术—材料科学与工程]