Microstructural Characteristics Analysis of PCE Copolymer from Methyl Allyl Polyethylene Glycol and Methacrylic Acid based on Determination of Monomer Reactivity Ratios  

作　　者：WANG Ziming KANG Yaxin PENG Jingying 王子明;康亚欣;PENG Jingying(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第2期223-229,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Key Materials and Preparation Technology of Long-life Concrete Products Project(No.2017YFB0310002)through the National Key R&D Program。

摘　　要：The reactivity ratio of monomer and the microstructure of copolymer as polycarboxylate ether(PCE)superplasticizer were investigated.Polycarboxylate ethers(PCEs)were synthesized from methyl allyl polyethylene glycol(MAPEG,Mw=2400 g/mol)and methacrylic acid(MAA)via aqueous free radical copolymerization in low conversion(P<20%).Gel permeation chromatography(GPC)and high performance liquid chromatography(HPLC)were used to track the residual concentration of the reactants and the amount of copolymer formed during the copolymerization.The reactivity ratios of monomers,MAPEG and MAA,were determined as r1(MAPEG)=0.0489 and r2(MAA)=1.6173,respectively,by employing the K-T and YBR methods.According to the obtained monomer reactivity results,the sequence distribution of the copolymer,the number average length of MAA in the polymerisate were found to decline with the decrease of the mole fraction of MAA in the polymerization system.As a result,the distribution of chain segments becomes narrower and the copolymer structure becomes more uniform.Therefore,uniform polymers could be obtained by slowly adding MAA monomer during copolymerization process.

关 键 词：reactivity ratio POLYCARBOXYLATE K-T method COPOLYMER sequence distribution 

分 类 号：TQ317[化学工程—高聚物工业]