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Citation: DUAN Ying-Jun, WU Hua-Qiang, WANG Jun-En, YUAN Pin-Shi. Preparation of Emulsifier-free MMA/St Copolymer Nanoparticle Latex via Solvothermal Method[J]. Chinese Journal of Applied Chemistry, ;2005, 22(12): 1295-1299. shu

Preparation of Emulsifier-free MMA/St Copolymer Nanoparticle Latex via Solvothermal Method

1.
College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000

Corresponding author: WU Hua-Qiang,
Received Date: 7 February 2005
Available Online: 15 June 2005
Fund Project: 国家自然科学基金(20271002) (20271002)安徽省教育厅自然科学基金(2003kj140)资助项目 (2003kj140)

Emulsifier-free poly(styrene-methylmethacrylate)(P(St-MMA)) copolymer nanoparticles with an average diameter of about 31 nm were synthesized in an acetone-water medium with potassium persulfate(KPS) as the initiator by solvothermal method.The effects of amount of acetone,MMA/St ratio,the concentration of KPS and temperature on the polymerization rate,the particle size and the size distribution as well as the stability of the latex were investigated systematically.The results indicate that with increasing temperature,the particle size decreases first,and then increases and reaches a minimum at 90℃;with increasing the volume fraction of acetone or the volume ratio of MMA to St,the particle size decreases from 267 nm to 34 nm and the electrolyte-resistance stability of the latex increases;the polymerization rate in the last reaction stage falls down on increasing the volume fraction of acetone;with increasing the KPS concentration,the particle size decreases first and then increases.The solvothermal mothod has offered a new route to emulsifer-free macromolecule nanoparticles.
- solvothermal method,
- emulsifier-free emulsion polymerization,
- latex nanoparticle,
- poly(styrene-methylmethacrylate)
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