One step graft copolymerization of acrylic acid and sodium styrene sulfonate onto high-density polyethylene film by preirradiation method

High-density polyethylene (HDPE) films were irradiated by 60Co gamma ray with a dose of 100 kGy in air and then immersed in aqueous solution of acrylic acid (AA) and sodium styrene sulfonate (SSS) at different temperature. The effects of grafting conditions such as temperature, reaction time, Mohr’s salt concentration, and total concentration of monomer on grafting yield were studied. Both grafting yield of AA and SSS onto HDPE respectively increases with total concentration of monomers. The highest grafting yield was observed at 3 mol/L monomers where the grafted PE swelled to the largest extent in the monomers mixture. The grafting yield increases with reaction time and then levels off. At higher temperature, the grafting yield decreases with Mohr’s salt concentration, but increases at low temperature when Mohr’s salt concentration is 0.083%. Which can be interpreted that in the presence of Fe2+ diperoxides and hydroperoxides may decompose at low temperature to form radical which can initiate the grafting. The physical and chemical properties of grafting films were also investigated.

预辐射接枝法制备FEP-g-PSSA/AA膜

采用γ射线预辐射接枝方法制备了FEP?g?PSSA/AA膜,反应制得的接枝膜是一种含氟磺酸型质子交换膜。系统研究了影响接枝反应的阻聚剂用量、膜的厚度、单体摩尔比及总摩尔浓度变化等因素。结果表明,丙烯酸(Acrylicacid,AA)与苯乙烯磺酸钠(Sodiumstyrenesulfonate,SSS)对全氟乙丙烯(Polytetrafluoroethylene-co-hexafluoropropylene,FEP)的接枝率几乎不受膜厚度变化的影响,而且全氟乙丙烯(FEP)辐照后放置三个月再进行接枝反应,接枝率也几乎没有变化。

预辐照聚乙烯膜共接枝丙烯酸和苯乙烯单体的研究

利用预辐照聚乙烯膜产生的过氧化物与丙烯酸和苯乙烯单体共接枝，讨论了单体组成、单体浓度、预辐照剂量、接枝温度等因素对接枝共聚反应的影响，结果表明，二单体共接枝率高于单一单体接枝率，且在反应温度为６０℃，预辐照剂量为３０～４０ｋＧｙ，单体配比（丙烯酸／苯乙烯，体积分数）为１：１时，接枝率最大。初步建立了单体共接枝速率（Ｒ_ｇ）与单体浓度（ρ）及预辐照剂量（Ｄ）之间的关系为Ｒ_ｇ∞ρ^（１．１０）Ｄ^（０．７８）。

新型抗凝血渗析膜的研制──聚乙烯膜上丙烯酸和苯乙烯的辐射接枝

以丙烯酸和苯乙烯为单体，聚乙烯膜为基体，利用过氧化预辐照接枝技术，研制出一种具有亲水－疏水平衡结构的新型抗凝血渗析膜。探讨了单体组成对膜性能的影响。结果表明：当丙烯酸和苯乙烯单体组成为１∶１（体积比）时，接枝膜具有较好的机械性能。与未接枝膜相比，抗凝血性提高了约３０倍，渗析性提高约１０倍。