Journal
CARBOHYDRATE POLYMERS
Volume 102, Issue -, Pages 278-287Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.11.044
Keywords
beta-Cyclodextrin (CD); Superplasticizer; Adsorption; Dispersion; Retarding effect
Categories
Funding
- Guangdong-Hongkong Technology Cooperation Finding [2009A091300012]
- National Natural Science Foundation of China [20974121]
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In this paper, the efficient approach for the synthesis of beta-cyclodextrin (CD) based functional monomers was described. Based on the monovinyl beta-CD monomer (GMA-EDA-CD), a new type poly(AA-co-GMA-EDA-CD) (PCDs) copolymer bearing pendent CD groups was synthesized and used as superplasticizer. Their chemical compositions were characterized by FT-IR, NMR, MALDI-TOF and GPC. The effects of PCDs on dispersion and adsorption in cement mortars were detailed discussed. The results indicated that PCD copolymers behaved excellent dispersion ability and strong retarding effect. PCD2 with molar ratio (%) for monomer (AA:GMA-EDA-CD = 80:20) had the best dispersion and dispersion maintaining abilities, which were mainly attributed to the synergistic effects of steric hindrance and electrostatic repulsive force, and the retarding effect of PCD copolymers resulted from steric hindrance repulsion of CD pendants and the large number of hydroxyl groups, which affected the hydration reaction of cement. (C) 2013 Elsevier Ltd. All rights reserved.
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