【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。更多还原

【Abstract】 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 nanoparticles 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.更多还原