摘要
以多官能度丙烯酸酯类单体为辐照敏化剂 ,在氮气保护下 ,通过60 Co -γ射线的引发作用 ,将普通线性聚丙烯改性成为具有长支化结构的高熔体强度聚丙烯。研究了辐照敏化剂的官能度数、用量以及辐照的剂量对凝胶含量的影响。通过辐照聚丙烯熔体流动速率和熔体强度的测定 ,可以得出结论 :在氮气氛围中 ,普通聚丙烯树脂加入 1.0%的两官能度辐照敏化剂 ,采用 1kGy剂量的60 Co -γ射线进行辐照 ,可得到较高熔体强度的聚丙烯 ;增塑剂和抗氧剂的加入 ,以及聚丙烯辐照前、后的热处理对辐照聚丙烯熔体强度的提高均有不同程度的促进作用。
High melt strength polypropylene was prepared with the initiation of 60 Co-γ radiation in nitrogen environment, using polyfunctional acrylate monomers as radiation sensitizer. Influences of functionalities and amount of radiation sensitizer, and dose of radiation on the gel content were investigated. The melt flow rate and melt strength of radiated polypropylene were measured. The results show that high melt strength polypropylene was got by 60 Co-γ radiation with 1kGy dose in nitrogen environment. Adding plasticizer or antioxidant, and thermal treatment before or after irradiation can enhance melt strength of irradiated polypropylene in different degree respectively.
出处
《中国塑料》
CAS
CSCD
北大核心
2002年第1期19-22,共4页
China Plastics
