阻燃PS的流变性能

Rheological behavior of flame retardant PS

在聚苯乙烯(PS)中填充十溴二苯醚或共混溴化聚苯乙烯(BPS)得到阻燃PS。借助毛细管流变仪,研究了阻燃PS的流变性能。结果表明：阻燃PS熔体表观黏度(η_n)随剪切速率的增大而减小、随温度的升高而降低,具有假塑性流体的特性；填充十溴二苯醚的阻燃PS的η_n比纯PS显著降低,黏流活化能(E_η)为40.74kJ/mol,200～220℃时,非牛顿指数(n)为0.35～0.43；共混BPS的阻燃PS的η_n与纯PS接近,E_η为75.32kJ/mol,200～220℃时,n为0.48～0.57。

Flame retardant polystyrene (PS) was prepared through adding decabromodiphenyl oxide/ether (DBDPO) into PS or blending PS with brominated polystyrene (BPS). The rheology of the flame retardant PS was studied by means of a capillary rheometer. The result shows that the flame retardant PS possesses the features of pseudo plastic fluid, its apparent viscosity (ηa) decreases as the shear rate or the temperature rises. The ηa of the flame retardant PS containing DBDPO decreases even more obviously compared with pure PS. Its apparent viscous flow activation energy (Eη is 40.74 kJ/mol and non-Newtonian indexes is in the range of 0.35-0.43 at temperatures 200-220°C. The PS/BPS blend has a ηa close to that of pure PS. Its Eη is 75.32 kJ/mol and non-Newtonian index is in the range of 0.48-0.57 at temperatures 200-220°C.