微波合成聚羧酸超塑化剂的自由基聚合竞聚率  

Free Radical Polymerization Reactivity Ratio of Polycarboxylate Superplasticizer by Microwave Synthesis

作　　者：王芳[1] 王栋民[1] 张力冉[2] 王启宝[1] 于杰 张川川 WANG Fang;WANG Dongmin;ZHANG Liran;WANG Qibao;YU Jie;ZHANG Chuanchuan(China University of Mining and Technology（Beijing）,Beijing 100083,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国矿业大学(北京)化学与环境学院,北京100083 [2]清华大学土木工程系,北京100084

出　　处：《硅酸盐学报》2018年第8期1103-1110,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51572293)资助

摘　　要：运用微波法合成技术,以丙烯酸（AA）、甲基烯基聚氧乙烯醚（TPEG）为主要原料,微波合成超塑化剂（MAS-PC）。通过微波与传统加热体系下竞聚率的计算,解释两种体系下合成聚羧酸超塑化剂系列结构的本质差异。运用化学滴定法测定共聚物组成,通过Yezreielv Brokhina Roskin（YBR）法、Kelen Tudos（K-T）法求得单体竞聚率值,对比分析了MAS-PC与传统水浴加热法合成的聚羧酸超塑化剂（CHS-PC）的红外光谱、分子量及其分布、阴离子电荷密度及其竞聚率。结果表明：MAS-PC的质均分子量大于CHS-PC的,且MAS-PC的转化率更高;与CHS-PC相比,MAS-PC对新拌浆体絮凝结构拥有更好的分散性能;采用YBR法及K-T法,MAS-PCE的竞聚率分别为0.170与0.155,更接近于交替共聚,均优于CHS-PCE的竞聚率0.307与0.294。The microwave synthesized polycarboxylate superplasticizer（MAS-PC） was prepared by a microwave synthesis method using acrylic acid（AA） and methylene polyoxyethylene ether（TPEG） as main raw materials. The essential difference between the polycarboxylate superplasticizer structures in microwave and conventional heating systems was analyzed by calculating a reactivity ratio between the two systems. The composition of the copolymer was determined by a chemical titration method. The reactivity ratio of monomer was obtained by the Yezreielv Brokhina Roskin（YBR） and the Kelen Tudos（K-T） methods. The polycarboxylate superplasticizer（CHS-PC） synthesized via water bath heating and the MAS-PC were analyzed by means of infrared spectra, molecular mass, molecular mass distribution, and anion charge density, respectively. The results show that the mass average molecular mass（i.e., 93 100 g/mol） of MAS-PC is greater than that of CHS-PC（i.e., 78 270 g/mol）. The conversion of MAS-PC is greater. The MAS-PC has a better dispersion performance rather than the CHS-PC for flocculated cement structure. By YBR and K-T, the reactivity rates of MAS-PCE were 0.170 and 0.155, which were superior to CHS-PCE（i.e., 0.307 and 0.294）. The systhesis of MAS-PCE is close to alternating copolymerization.

关 键 词：微波合成 竞聚率 聚羧酸超塑化剂 分散性能 

分 类 号：TU528[建筑科学—建筑技术科学]