【摘要】 以丙烯酸(AA)、甲基丙烯酸(MAA)、马来酸酐(MA)3种不饱和单体和不同EO(环氧乙烷)聚合数(n=9~75)的烯丙醇聚氧乙烯醚(APEG)大单体聚合成了烯基聚醚型聚羧酸共聚物,考察了聚合反应中APEG转化率的影响因素,研究了烯基聚醚型聚羧酸共聚物的分子结构及其对水泥净浆的分散能力.结果表明:当不饱和单体为AA或MA时,APEG(n=50)转化率较高;当不饱和单体为MAA时,APEG(n=50)转化率较低;APEG转化率随其摩尔质量的增大而减小.n为27,50的AA-APEG共聚物具有良好的分散性能,而带中等长度主链(13.6~15.9 nm)的AA-APEG共聚物则具有良好的分散稳定性;AA-APEG共聚物初始分散性能在一定范围内随不饱和酸(AA)单体量的增大而提高,而分散稳定性则随不饱和酸(AA)单体量的减小、侧链化程度的增大而提高.更多还原

【Abstract】 Carboxylic acid allyl polyether type copolymers were synthesized by copolymerization of unsaturated monomers like acrylic acid(AA),methacrylic acid(MAA) or maleic anhydride(MA) with allyl polyoxyethylene ether glycol(APEG) macro-monomers with poly(ethylene oxide) chain length(PEOs,n)from 9-75.The effect factors on transfer rate of APEG were examined.The molecular structure of copoly-mers and its dispersing ability to cement paste were also investigated.The results show that APEG(n=50) has higher transfer rate when it is copolymerized with AA or MA than it has when it is copolymerized with MAA.The transfer rate decreases with increase of molar mass of APEG.AA-APEG copolymers with n=27,50 show better dispersing ability,while AA-APEG copolymers with medium length of backbone(13.6-15.9nm) have good dispersing stability.In a certain extent,initial dispersing ability of AA-APEG copolymers is improved with the increase of unsaturated acid(AA) monomer,while dispersing stability is improved with decrease of unsaturated acid(AA) monomer and with increase of density of side chain.更多还原