摘要
通过差示扫描量热法(DSC)测定了PS/纳米CaCO3复合材料的玻璃化转变温度及热物理老化样品的解缠结热焓。结果表明:纳米粒子加入有利于PS分子链段松弛运动,PS/纳米CaCO3复合材料的Tg随纳米粒子含量增加而有不同程度的下降。复合材料物理老化后,Tg向高温方向移动,解缠结热焓值比纯PS增大并随物理老化温度的提高而增加。68℃或78℃老化样品分别在纳米CaCO3质量分数为1%和3%时出现最大解缠结热焓值。与PS/纳米CaCO3相比,PS/包覆纳米CaCO3复合材料的Tg虽然变化不大,但解缠结热焓值提高。
The glass transition temperature （Tg） of PS/nano-CaCO3 composites and enthalpy recovery of physical aging samples were determined by differential scanning calorimetry （DSC） analysis. The results showed that nanometer particles enhanced the segmental relaxation behavior of PS, and decreased the Tg of PS/nano-CaCO3 composites to same extent with the increase of nano-CaCO3 contents. The Tg of PS/nano-CaCO3 composites moved to a higher temperature with an enhancement of enthalpy recovery, compared with pure PS after physical aging. The mass concentration with 1% or 3% nano-CaCO3 physically aged at 68 or 78 ~C reached a maximum enthalpy recovery near the glass transition respectively. The T and enthalpy recovery of PS/encapsulated nano-CaCO3 composites became higher than those of PS/nano-CaCO3 composites.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第5期54-57,62,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
广东省自然科学基金重点资助项目(021731)
广东省科技攻关计划资助项目(2003B10503)
