摘要
利用表面固定伯胺分子层的纳米SiO2粒子(NH2-SiO2)与Cu2+构成氧化-还原体系,引发N,N-二甲基丙烯酰胺(DMAAm)的自由基接枝聚合,得到表面包覆聚合物的纳米SiO2杂化粒子(P-SiO2),采用差示扫描量热法(DSC)研究了NH2-SiO2和P-SiO2对聚乳酸(PLA)非等温冷结晶行为的影响,并用莫志深法对PLA及其复合材料的非等温冷结晶动力学进行了分析。结果表明:PLA和PLA/SiO2复合材料的非等温冷结晶过程均可用莫志深动力学方程来描述;两种SiO2在PLA中均起到了较好的冷结晶促进剂的作用;较之于NH2-SiO2,纳米杂化粒子P-SiO2的结晶促进效果更加明显。
The amino-terminated SiO2 nanoparticles （NH2-SiO2） constituted a redox-initiating system with CuSO4 for the surface-initiated radical graft polymerization of electron-deficient monomers DMAAm, and SiO2 hybrid nanoparticles （P-SiO2） were formed. The influence of two kinds of nano-silica on the non-isothermal cold crystallization behavior of poly（lactic acid） （PLA） was studied by differential scanning calorimetry （DSC）. The non-isothermal cold crystallization data for PLA and PLAJSiO2 composites were analyzed by Mo Zhi-Shen method. The results indicate that the non-isothermal cold crtstallization processes of PLA and PLA/SiO2 composites may be described using the kinetic equation of Mo. These two kinds of SiO2 play the role of cold crystallization rate promoter for the crystallization of PLA in the blends. Compared with NHz-SiO2, the promoting effect of hybrid nanoparticles P-SiO2 is more obvious.
出处
《塑料科技》
CAS
北大核心
2014年第11期91-95,共5页
Plastics Science and Technology
关键词
聚乳酸
非等温冷结晶
纳米二氧化硅
差示扫描量热法
Poly（lactic acid）
Non-isothermal cold crystallization
Nano-Si02
Differential scanning calorimetry
