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.
参考文献
| [1] | 王孝军,李伟,杨杰,唐清华.聚合物纳米复合材料结晶行为研究进展[J].现代塑料加工应用,2007(01):59-61. |
| [2] | 莫志深.一种研究聚合物非等温结晶动力学的方法[J].高分子学报,2008(07):656-661. |
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