预辐照聚乙烯醇纤维与N,N’-亚甲基双丙烯酸酰胺的接枝、交联

Graft Polymerization of N,N’-Methylenebisacrylamide and Crosslinking with Preirradiated PVA Fiber

在缓冲溶液和亚铁离子存在下 ,辐照后的聚乙烯醇 ( PVA)纤维和 N ,N -亚甲基双丙烯酸酰胺 ( N ,N -MBAA)发生接枝、交联反应 .研究了单体浓度、单体和聚合物质量比、亚铁离子浓度、p H值、温度、时间对接枝率的影响 .结果表明 ,适合于提高 PVA纤维的耐热软化点的接枝率为 1 5 %～ 2 0 % ,较佳的工艺条件为 :亚铁离子浓度为 0 .0 0 1 mol/L ,单体浓度大于 2 .5 g/d L,单体和聚合物的质量比 ( m ( N ,N -MBAA) /m( PVA) )大于 0 .4 ,p H值 3.4 ,接枝温度 80℃ ,接枝反应时间 1 5～ 30 min.

Polyvinyl alcohol(PVA) preirradiated by 60 Co γ ray was graft copolymerized and crosslinked with N,N-methylenebisacrylamide(MBAA) in buffered aqueous solution in the presence of ferrous ions. The effects of monomer concentration, mass ratio of MBAA to PVA, ferrous ion concentration, pH value, temperature and time on the grafting degree were investigated. The results showed that the softing point of PVA could be increased 15%~20% under the following grafting conditions: c(Fe 2+ )>0 001 mol/L, c(MBAA)=2 5 g/dL, m(N,N-MBAA)/m(PVA)>0 4, pH=3 4, at 80 ℃ for 15~30 min.