The Properties and Morphology of Poly (Butadiene-Graft-Styrene) Latex Modified Mortars

Abstract:

Polybutadiene-graft-polystyrene (PB-g-PS) latex were prepared via emulsion graft copolymerization method. The weight ratios of polybutadiene to styrene ranged from 70/30, 50/50 to 30/70, then the PB-g-PS latex was used to modify cement mortar. This study examines the effects of core-shell ratios（c/s） on the typical properties and morphology of PB-g-PS latex modified mortars. The PB-g-PS latex modified cement mortar were prepared at different polymer-cement ratios（p/c）, and tested to obtain the water-cement ratios（w/c）, fluidity, water retention rate, flexural and compressive strengths. SEM was used to investigate the microstructure of polymer- modified mortars（PMMs）. On the basis of the test results, effect of the c/s and p/c on the typical properties and morphology of PMMs were discussed. It is concluded that PB-g-PS core-shell latex can be incorporated into cement as modifier.

• Periodical: Applied Mechanics and Materials (Volumes 48-49)
• Pages: 1286-1289
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.48-49.1286
• Online since: February 2011
• Authors: Wen Jie Zhao, Hui Xuan Zhang
• Keywords: Core-Shell Ratios, Morpholoy, PB-g-PS Latex, Polymer-Modified Mortar, Property Analysis

References

[1] Ugelstad J, Mfutakamba H R, Mørk P C, in: Preparation and application of monodisperse polymer particles[J], Polym. Sci: Polym. Symp, 1985, 72 : 225-240.

DOI: 10.1002/polc.5070720125

[2] Merkel M P, Dimonie V L, El-Aasser M S , Vanderhoff J W , in: Process parameters and their effect on grafting reactions in core/shell latexes[J], Polym. Sci Part A: Polym. Chem, 1987, 25: 1755-1767.

DOI: 10.1002/pola.1987.080250705

[3] Ohama Y, Demura K, Hamatsu M, Kakegawa M, in: Properties of polymer-modified mortars using styrene-Butyl acrylate latexes with various monomer ratios[J], ACI Mater.J. 1991, 88: 55-61.

DOI: 10.14359/2374

[4] ACI Committee 548, in: Guide for the use of polymers in concrete[M], American Concrete Institute, (1992).

[5] Ohama Y, in: Handbook of polymer-modified concrete and mortar: Properties and Process Technology[M], New Jerdey, USA: Noyes Publications, (1995).

[6] Barluenga G, Hernandez-Olivares F, in: SBR latex modified mortar rheology and mechanical behaviour[J], Cem. Concr. Res, 2004, 34: 527-535.

DOI: 10.1016/j.cemconres.2003.09.006

[7] Bureau L, Alliche A, Pilvin P, Pascal S, Mechanical characterization of a styrene-butadiene modified mortar[J], Mater. Sci. Eng. A, 2001, 308: 233-240.

DOI: 10.1016/s0921-5093(00)01980-8

[8] Shaker F A., El-Dieb A S, Reda M M, in: Durability of styrene-butadiene latex modified concrete[J] , Cem. Concr. Res, 1999, 27（5）: 711-720.

DOI: 10.1016/s0008-8846(97)00055-0

[9] Bellagraa P F G, L, Benaggoun L, Properties of polymer-modified mortars made with blended cements[J], Adv. Cem. Res, 1993, 5（19）: 103-109.

DOI: 10.1680/adcr.1993.5.19.103

[10] Ohama Y, in: Polymer-modified mortars and concretes, in: V.S. Ramachandran(Ed. ), Concrete Admixtures Handbook: Properties, Science and Technology[M], Park Ridge, NJ, USA: Noyes Publications, (1984).

DOI: 10.1016/b978-081551373-5.50013-1