Synthesis of Poly (Butadiene _g_Styrene) Core-Shell Latex for Use in Cement Modifying

5th Annual International Workshop on Materials Science and Engineering

Wang, Dong^1 ; Zhao, Tingting^1 ; Zhao, Wenjie^1

Polymeric Chemistry and Physics, Changchun University of Technology, Chemical Engineering, yan'an avenue, Chaoyang Distric, Changchun, China^1

关键词: Core shell structure;    Graft co polymerizations;    Initiator concentration;    Mean particle diameter;    Nuclear magnetic resonance techniques;    Reaction temperature;    Redox initiator systems;    Solvent-extraction techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/585/1/012028/pdf
DOI  :  10.1088/1757-899X/585/1/012028

来源: IOP

【 摘 要 】

Polybutadiene-graft -polystyrene (PB-g -PS) latex with different ratios of polybutadiene to polystyrene were prepared via emulsion graft copolymerization method through grafting styrene onto polybutadiene latex using a redox initiator system. The PB macroradicals reacted with styrene to form graft copolymers. The effect of initiator concentration, reaction temperature, grafting monomer/polybutadiene weight ratios, and monomer dropping time on the conversion, grafting efficiency, degree of grafting, and mean particle diameter of graft copolymerization reaction were investigated. The grafting efficiency of PB-g-PS was determined by a solvent-extraction technique. Fourier transform infrared spectroscopy and nuclear magnetic resonance technique were used to confirm structure of the synthesized copolymers. Transmission election micrographs verified that the synthesized latex particles had a core -shell structure, which can be incorporated into cement as modifier.