中文摘要：

通过差示扫描量热法和动态力学分析对PC/PS/纳米CaCO3和PC/PS/包覆纳米CaCO3复合材料物理老化前后PS相的玻璃化转变、β松弛及动态力学性能进行了研究。结果表明：纳米CaCO3有利于PS相的分子链段松弛运动,PC/PS/纳米CaCO3复合材料PS相的Tg、损耗模量峰温和β松弛温度下降;包覆纳米CaCO3增加相界面间相互作用,PC/PS/包覆纳米CaCO3复合材料PS相的Tg、β松弛温度、储存模量和损耗模量峰温均较PC/PS/纳米CaCO3提高。随着物理老化时间的延长,PC/PS及复合材料PS相的Tg和β松弛温度提高,松弛热焓ΔH增加,其中,PC/PS/包覆纳米CaCO3的提高幅度较小。物理老化使得PC/PS/纳米CaCO3的存储模量提高。

英文摘要：

The glass transition（Tg）,β relaxation and dynamic mechanical properties of PC/PS/ nano-CaCO3 and PC/PS/encapsulated nano-CaCO3 composites before and after physical aging were characterized by DSC and DMA analysis,in order to study the effect of nano-fillers on the segment relaxation movement of PS.The results showed that the nano-CaCO3 accelerated the segment relaxation of PS due to the weak interaction between the matrix and the nano-particles,the Tg,loss modulus peak temperature and β relaxation temperature of PS phase decrease.On the contrary,encapsulated nano-CaCO3 preferred to improve the interface interaction and thus increased the Tg temperature,the loss modulus peak temperature,β relaxation temperature and storage modulus of PC/PS/encapsulated nano-CaCO3 composites compared with PC/PS/nano-CaCO3 composites.The Tg and enthalpy loss of PC/PS,PC/PS/nano-CaCO3 and PC/PS/encapsulated nano-CaCO3 composites all increased with the time of physical aging,but the increment was fewer for PC/PS/encapsulated nano-CaCO3 composites.Physical aging induced different enhancement in the storage modulus of PC/PS/nano-CaCO3 composite.