本文選題：pH響應(yīng)性膜 + 乙烯-乙烯醇共聚物��； 參考：《高分子材料科學(xué)與工程》2017年08期

【摘要】：具有納濾特性的pH響應(yīng)性膜在小分子分離體系中具有廣泛應(yīng)用前景。文中以鑄膜液濃度為25%的乙烯-乙烯醇共聚物(EVAL)超濾膜為基膜,接枝具有pH響應(yīng)性的功能單體甲基丙烯酸二甲氨基乙酯,制備pH響應(yīng)性EVAL膜,通過考察膜對標(biāo)準(zhǔn)物聚乙二醇(PEG)與無機(jī)鹽的截留性能,研究其納濾特性。結(jié)果表明,當(dāng)pH小于pKa時(shí),pH響應(yīng)性EVAL膜對聚乙二醇(PEG)與無機(jī)鹽的截留效果均明顯高于未接枝膜,接枝率6%的接枝膜對PEG 800、PEG 1000及PEG 2000的截留率均達(dá)到90%以上,對二價(jià)陽離子的截留率達(dá)到80%以上,無機(jī)鹽的截留順序?yàn)?CaCl_2MgCl_2MgSO_4NaClNa2SO_4。當(dāng)pH大于pKa時(shí),PEG及無機(jī)鹽截留率明顯下降,膜對PEG 1000的截留率由95.6%降至62.9%,對MgCl_2截留率降至30.6%,截留率及膜水通量變化存在顯著的pH響應(yīng)性。
[Abstract]:Ph-responsive membranes with nanofiltration properties have wide application prospects in small molecular separation systems. In this paper, the pH responsive EVAL membrane was prepared by grafting the functional monomer dimethylaminoethyl methacrylate (DMA) with dimethylaminoethyl methacrylate (DMA) onto the ultrafiltration membrane containing 25% ethylene-vinyl alcohol copolymer (EVALL) as the base membrane. The nanofiltration properties of PEG and inorganic salts were studied. The results showed that when pH was less than PKA, the retention efficiency of PEG- PEGand inorganic salt was significantly higher than that of non-grafted membranes, and the rejection rates of PEG800 PEG1000 and PEG2000 on PEG800 and PEG2000 were over 90% when the pH value was less than PKA. The rejection rate of bivalent cations is more than 80%, and the order of rejection of inorganic salts is: CaCl2MgCl2MgSOs. When pH was higher than PKA, the retention rate of PEG and inorganic salt decreased obviously, the rejection rate of membrane to PEG 1000 decreased from 95.6% to 62.9%, and the rejection rate of MgCl2 decreased to 30.6%. There was a significant pH response to the change of retention rate and membrane water flux.
【作者單位】： 省部共建分離膜與膜過程國家重點(diǎn)實(shí)驗(yàn)室天津工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51373120,51503146) 天津市應(yīng)用基礎(chǔ)與前沿技術(shù)研究計(jì)劃(15JCZDJC37600) 長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃資助(IRT13084) 天津市科技計(jì)劃項(xiàng)目自主課題(15PTSYJC00240,15PTSYJC00230)
【分類號】：TQ051.893
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本文編號：2029500