Glass transition and free volume of high impact polystyrene/TiO2 nanocomposites determined by dilatometry

被引：17

作者：

Wang, Zhaobo

Pang, Hongtao

Li, Guicun

Zhang, Zhikun

机构：

[1] Qingdao Univ Sci & Technol, Key Lab Nanostructured Mat, Qingdao, Peoples R China

[2] Ocean Univ China, Fishery Coll, Qingdao, Peoples R China

来源：

JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS | 2006年 / 45卷 / 05期

关键词：

polystyrene; TiO2; nanocomposites; dilatometry; glass transition; free volume;

D O I：

10.1080/00222340600890497

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The glass transition and free volume of high impact polystyrene (HIPS)/TiO2 nanocomposites are investigated by dilatometry, along with the influence of free volume variation on rheological behavior and deformation temperature. Transmission electron microscopy (TEM) and field-emission scanning electron microscopy (FE-SEM) show the presence of monodispersed nanoparticles and small agglomerated particles. The glass transition temperature (T-g) of nanocomposites containing 1-3% TiO2 is slightly lower than that of HIPS. The enhanced segmental motion of HIPS molecules located in the interface region results in the occurrence of extra free volume and the depression of T-g. The thermal expansion coefficient of HIPS increases with increasing TiO2 content and is obviously higher that of the free volume in the nanocomposites. Furthermore, the abnormal variation in rheological behavior and deformation temperature is consistent with the increase of free volume.

引用

页码：689 / 697

页数：9

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