超高分子量聚苯乙烯的性能测定

Determination for Characters of Ultra High Molecular Weight Polystyrene

<正> 聚苯乙烯(PS)制成高定向薄膜后可用于电视机、雷达、高频率电线等电器部件和发泡材料。其主要缺点是耐冲击强度低、耐温性差。大量的改性工作主要是通过混炼或共聚等方法制成非均聚物,其结果透明性不佳,而且生产工艺复杂、成本高。聚苯乙烯改性的另一个途径是提高其分子量,使_w达到4.0×10~5以上,形成超高分子量聚苯乙烯(UHMW PS)。

Ultra high molecular weight polystyrene with Mw = 68. 3 × 104-266 × 104, D = 2.9-7.2 was synthesized. The electrical, thermal, mechanical characters and rheologic behaviour were determined. The impact strength of the products was found to be 17. 9-38. 4 J/m, bending strength 86.8-110. 5 MPa, hot resistance 93-98℃, transparency 89% and flowviscosity activation energy 67. 7 kJ/mol.