偶合接枝聚乙二醇单甲醚实现聚砜膜材亲水性改性  

Hydrophilic Modification of Polysulfone Membrane Material by Coupling Grafting of Polyethylene Glycol Monomethylether

作　　者：杜瑞奎[1] 高保娇[1] 安富强[1] 李延斌[1] 

机构地区：[1]中北大学化学工程系,山西太原030051

出　　处：《过程工程学报》2011年第5期857-862,共6页The Chinese Journal of Process Engineering

基　　金：山西省自然科学基金资助项目(编号:2008021013);山西省研究生优秀创新基金资助项目(编号:20093077)

摘　　要：采用自制的氯甲基化试剂1,4-二氯甲氧基丁烷实施聚砜(PSF)的氯甲基化,再以Na2CO3为缚酸剂,使氯甲基化聚砜(CMPSF)的氯甲基与聚乙二醇单甲醚(PEGME)的端羟基之间发生亲核取代反应,将聚乙二醇(PEG)偶合接枝在聚砜侧链上,制得接枝共聚物PSF-g-PEG,实现了聚砜膜材的亲水性改性.表征了其化学结构,考察了主要因素对偶合接枝反应的影响,测定了PSF-g-PEG膜的静态水接触角.结果表明,CMPSF与PEGME的偶合接枝反应可顺利进行,CMPSF的氯甲基与PEGME端羟基间的亲核取代反应属单分子取代反应;溶剂的极性和反应温度对PEG的接枝度影响明显,极性越强,PEG的接枝度越大.当选用极性较强的二甲基乙酰胺作溶剂、最佳反应温度为70℃、反应36h时,PEG的接枝度接近480g/kg,使PSF-g-PEG膜的接触角由未接枝改性时的70°降至35°,亲水性显著增强.In the presence of acid-acceptor Na2CO3,the nucleophilic substitution between chloromethylated polysulfone（CMPSF） and polyethylene glycol monomethyl ether（PEGME） was conducted,and polyethylene glycol（PEG） was coupling-grafted onto the side chains of polysulfone（PSF）,so that the graft copolymer PSF-g-PEG was prepared and the hydrophilic modification of polysulfone membrane material realized.The chemical structure of PSF-g-PEG was characterized.The effects of main factors on the coupling graft reaction were examined.The water static contact angle of PSF-g-PEG membrane was determined.The experimental results show that the coupling graft reaction between CMPSF and PEGME can proceed successfully,and the reaction of chloromethyl groups of CMPSF with the hydroxyl end groups of PEGME is a typical SN1 nucleophilic substitution reaction.The polarity of the solvents and the reaction temperature affect the reaction greatly,that is,the stronger the polarity,the greater the grafting degree of PEG.When the dimethyl acetamide with strong polarity is chosen as the solvent,the reaction temperature is 70℃ and reaction time 36 h,grafting degree of PEG is close to 480 g/kg,the contact angle of PSF-g-PEG is greatly reduced from 70o to 35o,so its hydrophility is strongly enhanced.

关 键 词：聚砜 聚乙二醇 偶合接枝 亲水性改性 

分 类 号：O631[理学—高分子化学]