【摘要】 采用金红石型纳米TiO2改性HIPS塑料,SEM及FTIR分析表明,通过表面改性可将低分子有机物接枝到纳米TiO2表面,并提高了无机纳米粒子在HIPS树脂中的相容性和分散性。金红石型纳米TiO2复合改性HIPS经过28d的氙灯气候加速老化后,其力学性能在较长时间内得到保持,抗色变能力大幅度提高,分子链断裂得到有效抑制。FTIR分析老化机理表明,由于纳米TiO2与光稳定剂的协同作用使改性HIPS的光老化速度得到有效抑制,其羰基和羟基吸收峰的振动特征在28 d的老化期间内均未发生明显变化。更多还原

【Abstract】 The polystyrene was filled and modified with rutile nano-TiO₂ as antiaging additives.It was noted that low molecule organic substance was ingrafted onto nano-TiO₂ after surface modification,consequently which upgrading its consistent and disperse property in HIPS resin.After 28 days exposed to xenon arc lamp,the mechanics of HIPS modified by nano-TiO₂ kept for a long time.Furthermore,the ability of resisting color aberration was improved,and that rupture of molecule chain was restrained effectively.According to FTIR analysis,the aging mechanism revealed that the cooperating effect of nano-TiO₂ in company with organic UV-absorbent could restrict aging rate of modified HIPS in effect.Moreover there was little change for absorbing characteristic of carbonyl and hydroxyl group in the 28 days accelerating aging period.更多还原