PET/纳米TiO_2复合材料松弛行为的研究  

Relaxation Behavior of PET/nano-TiO_2 Composites

作　　者：李宁[1] 高翔[1] 郭耀[1] 毛立新[1] 金日光[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《塑料》2005年第4期33-37,共5页Plastics

摘　　要：以PET/纳米TiO2复合材料为对象,采用TMA、DMTA等手段,从分子运动的角度对该复合体系的松弛行为进行了研究。结果表明,纳米粒子在聚合物基体中与分子链通过物理或化学作用限制分子链的运动与松弛。体现在复合体系的温度-形变谱图中,随纳米TiO2含量的增加,玻璃化转变提前,橡胶平台降低,黏流温度升高。在温度黏弹谱中,与纯PET相比PET/纳米TiO2复合体系的α转变提前,储能模量增加,低温下损耗模量也有所增加。The relaxation behavior of PET and PET/nano-TiO2 was investigated by means of TMA and DMTA. The results showed that nano-particles restricted the movement and relaxation of the molecule,owing to the physical and chemical bonding with the matrix molecule. For temperature-deforming curves,the rubbery plateau region was lower and fluid temperature increased with increasing nano-TiO2 content. Compared with pure PET, the α transition of PET/nano-TiO2 composites shifted to lower temperature, the storage modulus increased, and the loss modulus in low temperature region also increased.

关 键 词：PET 纳米TIO2 松弛 动态力学性能 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]