辐照改性聚丙烯抗熔垂能力的研究

Research on Sag Resistance of Polypropylene Modified by Gamma Ray Irradiation

采用熔垂测试仪测量了不同配方辐照改性聚丙烯(PP)的抗熔垂能力,分析了温度、敏化剂含量、辐照剂量和高相对分子质量物质等因素对PP抗熔垂能力的影响,提出了PP辐照过程中长支链的形成机理,解释了PP抗熔垂能力随辐照剂量变化的规律。结果表明,辐照改性能显著提高PP的抗熔垂能力,PP的抗熔垂能力随温度的升高而降低,并随敏化剂含量的增加而提高,在辐照过程中加入极少量高相对分子质量物质能有效提高PP的抗熔垂能力;

The sag resistance of polypropylene （PP） was improved via gamma ray irradiation. The effect of temperature, sensibilizer content, radiation dose, and high molecular weight component was investigated. It was demonstrated that higher temperature, greater radiation dose, and larger content of sensibilizer had resulted in better sag resistance. A small amount of high molecular weight component such as PE-UHMW can also bring a large enhancement of sag resistance. Consequently, the entanglement of long branches of the high molecular weight component was assumed to be responsible for the outstanding sag resistance of irradiated PP.