硅酸盐学报Issue(11)：1534-1539,6.DOI:10.7521/j.issn.0454-5648.2013.11.12
梳形结构聚羧酸系减水剂主链长度对性能的影响
Effect of Backbone Length on Properties of Comb-shaped Structure Polycarboxylate Superplasticizers
摘要
Abstract
A series of polycarboxylate superplasticizers (PCE) with different side chain lengths, a fixed side chain density and gradu-ally-decreased backbone length were synthesized.The molecular weight, the molecular weight distribution and the polymerization conversion ratio were measured by gel permeation chromatograph. The results reveal that the mole ratio of chain transfer agent to different macromonomers does not exceed 0.30 to avoid a low conversion rate. The appropriate backbone length is affected by the length of grafted side chain, and the shorter backbone length is appropriate for the longer side chain to achieve the better performance. By comparing different performances obtained from equimolar and equimass adding methods, we analyzed the solo molecular dis-perse efficiency and the comprehensive efficiency of PCE. It was found that the solo molecular performance increases when the backbone length increases, but the performance decreases after reaching the appropriate point. The retarding effect of PCE to cement hydration becomes more obvious when the main chain length increases.关键词
聚羧酸减水剂/主链长度/水化/分散效能/作用机理Key words
polycarboxylate superplasticizer/backbone length/hydration/disperse efficiency/action mechanism分类
建筑与水利引用本文复制引用
王子明,卢子臣,路芳,刘晓,李慧群..梳形结构聚羧酸系减水剂主链长度对性能的影响[J].硅酸盐学报,2013,(11):1534-1539,6.基金项目
国家自然科学基金(51208012)；国际科技合作项目(S2011GR-0398)资助。 （51208012）
