中山大学学报自然科学版 ›› 2011, Vol. 50 ›› Issue (1): 75-78.

• 研究论文 • 上一篇    下一篇

纳米CaCO3 对物理老化前后PC/PS性能的影响

李 谷1,2 ,王庆国1 ,丁 茜1 ,江 娟1,2 ,麦堪成1,2   

  1. (1. 中山大学化学与化学工程学院∥聚合物复合材料及功能材料教育部重点实验室,广东 广州 510275;2.中山大学化学与化学工程学院∥新型聚合物材料设计合成与应用广东省高校重点实验室,广东广州 510275)
  • 收稿日期:2010-11-06 修回日期:1900-01-01 出版日期:2011-01-25 发布日期:2011-01-25

The Effect of NanoCaCO3 on PC/PS Properties before and after Physical Aging

LI Gu 1,2,WANG Qingguo 1 ,DING Qian 1 ,JIANG Juan 1,2 ,MAI Kancheng 1,2   

  1. (1. School of Chemistry and Engineering∥Key Laboratory Chemical for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yatsen University, Guangzhou 510275,China;2. School of Chemistry and Chemical Engineering∥Key Laboratory of Designed Synthesis and Application of Polymer Material, Sun Yatsen University, Guangzhou 510275 ,China)
  • Received:2010-11-06 Revised:1900-01-01 Online:2011-01-25 Published:2011-01-25

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CaCO3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。

Abstract: 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.

Key words: nanoCaCO3, polystyrene, physical aging, glass transition temperature, β relaxation

中图分类号: