PVDF粉体60Coγ射线共辐射接枝NVP

NVP Grafted onto PVDF Powder by 60Coγ-Ray co-Irradiation Graft Polymerization

摘要: 采用60Co-γ射线共辐射接枝聚合法，将N-乙烯基2吡咯烷酮（NVP）接枝到聚偏氟乙烯（PVDF）粉体上，以改善其亲水性。考察了反应过程中各种因素对接枝率(rDG)的影响，并对接枝产物进行了表征。结果表明：通过60Co-γ射线共辐射可有效实现NVP在PVDF粉体上的接枝。当辐射吸收剂量为40 kGy，阻聚剂六水合硫酸亚铁铵浓度为3 mmol/L，NVP体积分数为15%，甲醇为溶剂时，rDG达到18.6%，且接枝后PVDF粉体的亲水性明显提高

Abstract: The 60Coγ-ray co-irradiation graft polymerization was adopted to graft N-vinyl-2-pyrrolidone (NVP) onto poly(vinylidene fluoride) (PVDF) powder in order to improve their hydrophilicity. The effects of various factors on the degree of grafting (rDG) were investigated in detail. The resulting pro-ducts were characterized by different means. Results showed that NVP can be grafted onto PVDF powder efficiently by the 60Coγ- ray co-irradiation graft polymerization. The rDG reached 18.6% when the graft polymerization was performed in the methanol at the NVP volume fraction of 15%, the irradiation dose of 40 kGy and the Mohr’s salt concentration of 3 mmol/L. The hydrophilicity of PVDF powder was improved significantly after grafting NVP on them.