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Citation: ZHANG Kai, HUANG Chunbao, SHEN Huifang, CHEN Huanqin. Structure and Morphology of Polychloroprene-Polymethylmethacrylate Composite Latex Particles[J]. Chinese Journal of Applied Chemistry, ;2012, 29(10): 1111-1116. doi: 10.3724/SP.J.1095.2012.00522 shu

Structure and Morphology of Polychloroprene-Polymethylmethacrylate Composite Latex Particles

1.
a School of Chemistry and Life Science, Hubei Key Laboratory of Economic Forest Germplasm Improvement and Resources Comprehensive Utilization, Huanggang Normal University, Huangzhou 438000, China;
2.
b School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding author: ZHANG Kai,
Received Date: 25 November 2011
Available Online: 26 March 2012
Fund Project: 湖北省自然科学基金面上项目(2010CDZ065) (2010CDZ065)黄冈师范学院博士基金项目(09CD156) (09CD156)

Polychloroprene-polymethylmethacrylate(PCR-PMMA) composite latex particles have been prepared through the seed emulsion polymerization with polychloroprene latex(Pa) and methyl methacrylate(Pb) as the seed and monomer,respectively.Thermodynamic analysis results showed that when Φ_b(volume fraction of polymer b)0.69,the Pa-Pb core-shell latex particles and(Pa+Pb) separated latex particles were formed;while when Φ_b0.69,the inverted Pb-Pa core-shell latex particles and Pa-Pb core-shell latex particles were formed.Kinetic analysis results showed that the initiator type,the monomer feed type,crosslinking of the seed latex particles,and the monomer-to-rubber ratios were major factors influencing the particle morphology.When potassium persulfate was used as the initiator,the monomer-starved conditions led to the formation of normal core-shell particles,whereas flooded-feed MMA could not favor in formation of typical core-shell particle.While when azobisisobutyronitrile(AIBN) was used as the initiator,it led to the formation of inverted core-shell particles no matter if monomer-starved or flooded condition was used.Crosslinking of the polychloroprene seed particles was found to favor to form obvious core-shell PCR-PMMA particles.With the monomer-to-rubber ratio increasing,the shell layer turned thicker,the composite latex particle still showed core-shell structure,which was in agreement with the predicted results of thermodynamic analysis.The inverted core-shell PCR-PMMA composite latex particles were gradually changed to interpenetrating structure as the amount of monomer was increased when AIBN was used.
- latex particle morphology,
- thermodynamic,
- kinetic,
- seeded emulsion polymerization
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