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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.53  No.3 (2012)  >  pp.553-558

MATERIALS TRANSACTIONS
<<Previous article Vol.53  No.3 (2012)   pp.553 - 558 Next article>>

Effects of Grafting Densities of Comb-Like Copolymer on the Dispersion Properties of Concentrated Cement Suspensions

Jiaping Liu1), Qianping Ran1)2), Changwen Miao1) and Min Qiao2)
1) State Key Laboratory of High Performance Civil Engineering Materials (Jiangsu Research Institute of Building Science)
2) Jiangsu Bote New Materials Co. Ltd.


Effects of grafting densities of comb-like copolymer on the dispersion properties of concentrated cement suspensions are investigated systemicly in this paper. For comb-like copolymers the adsorbed amount increases at the same dosages as the grafting density decreases, while the efficiency of dispersion is improved by increasing the grafting densities. Based on the theory of Flatt at level of scaling law, the molecule size and the occupied surface area of the comb-like polymers with different grafting densities are calculated. The comb-like polymers with higher grafting density has bigger molecular size. For comb-like polymer dispersant, the steric repulsion provided by the side chains is the main drive of the dispersion, so the Flory energy is employed to explore the relationship between steric repulsion and grafting density. The calculation tells us that higher grafting density results in higher Flory energy which represents stronger steric repulsion. The calculation method based on the scaling law and Flory theory is successfully used to interpret the dispersion mechanism, and it is anticipated that this method can be applied to explain the effect of other parameters of PCE comb-like polymers on the dispersion properties of cement suspensions, ceramics suspensions, slurries and so on.


Keyword:
comb-like copolymer, grafting density, dispersion, cement, molecular size, steric repulsion

Received: November 07, 2011
Accepted: December 14, 2011 , Published online: February 25, 2012
Copyright (c) 2012 The Japan Institute of Metals

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