Study on Preparation and Dispersion Effect of Polycarboxylate Superplasticizer with Broken Dentiform Structure
Based on the analysis of the chemical structure of polycarboxylate-type SPs grafted PEO side chains, as well as sulfonic and carboxylic acid groups, a kind of polycarboxylate-based SPs grafted varied PEO side chains were synthesized by using radical polymerisation techniques.The relative dispersing effectiveness of the SPs was evaluated in cement paste and concrete by measuring paste flow and concrete slumps. The test results indicat that the copolymers with shorter PEO side chains (with 9 and 14 EO units) give lower initial dispersing power but higher time retention,with the prolonging of PEO side chains the higher initial dispersing effect and the lower time retention can be received. The excellent dispersing property and time retention of synthesized SPs for cementious systems can be achieved by grafted long side chain(with 45 EO units) integrated with short side chain(9 or 14 EO) at the backbone of anionic polymer.
Guangfan Li, Yong Huang and Chaohe Chen
Z. Y. Liu et al., "Study on Preparation and Dispersion Effect of Polycarboxylate Superplasticizer with Broken Dentiform Structure", Advanced Materials Research, Vols. 250-253, pp. 984-989, 2011