摘要
采用填加SiO_2增强的甲基乙烯基硅橡胶混炼压片。通过^(60)Co-γ射线引发辐射硫化,利用共辐照方法,将N-乙烯基吡咯烷酮接枝到该硅橡胶上,制备了高纯度医用水凝胶。本文较系统地研究了接枝单体浓度、辐照剂量率、剂量、温度和接枝试片厚度等因素对接枝共聚反应的影响。建立了接枝速率与单体浓度、剂量率之间的动力学关系式:R_g=k[M]^(4/5)D^(1/2)。讨论了反应机制和接枝区域。
The samples of sillca-filled Poly (methyl vinyl siloxane) rubbers werevulcanizated by cobolt-60 gamma radiation, and then the medicinal hydrogelsof higher purities were prepared by direct grafting by means of cobalt-60gamma radiation of N-vinyl-pyrrolidone onto silicone rubber films. In the present paper, the regularities of influence of dose, dose rate,monomer concentration, temperature, and film thickness on graftingcopolymerization were investigated systematically. The relationship equation ofgraftion rate with monomer concentration and dose rate was established to beR_g= k[M]^(4/5)/ D^(1/2), and reaction mechanism and grafting region were also dis-cussed.
出处
《功能高分子学报》
CAS
CSCD
1989年第2期133-136,共4页
Journal of Functional Polymers
关键词
医用水凝胶
硅橡胶
辐射接枝
NVP
medicinal hydrogel
silicone rubber
radiation vulcanization
radiation graft
N-vinyl pyrrolidone
