紫外线吸收剂对PBST薄膜耐候性的影响

研究了聚（丁二酸丁二醇?对苯二甲酸丁二醇）酯（PBST）薄膜在吐鲁番、海南2地的自然老化行为，采用高速拉伸仪、加强型投射雾影仪、差示扫描量热仪（DSC）等对薄膜老化前后的拉伸性能、光学性能和热性能进行了测试和表征，探究紫外线吸收剂（UVA）对PBST薄膜耐候性的影响。结果表明，随自然老化时间的延长，PBST薄膜的拉伸强度、断裂伸长率逐渐下降，透光率无明显变化，雾度逐渐提高，熔融温度（T_m）向低温方向移动； UVA可显著改善PBST的耐候性，最适宜添加量为0.5 %（质量分数）。

Influence of ultraviolet absorbers on weather resistance of PBST film

The natural aging behavior of poly（butylene succinate?butylene terephthalate） （PBST） films in Turpan and Hainan was studied， and their tensile， optical， and thermal properties before and after aging were investigated using a high?speed tensile tester， an enhanced projection haze tester， and a differential scanning calorimeter. The effect of UV absorber UVA on the weather resistance of PBST films were evaluated. The results indicated that the tensile strength and elongation at break of the PBST films gradually decreased with an increase in natural aging time， but the light transmittance seemed not to change significantly. Moreover， the haze of the films gradually increased， and their melting peak temperature shifted to a lower temperature. The UV absorber could significantly improve the weather resistance of PBST at an optimal addition amount of 0.5 wt%.