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Your search keyword '"Weng, Zhi"' showing total 35 results
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35 results on '"Weng, Zhi"'

2. Preparation of polystyrene/poly(methyl methacrylate) core-shell composite particles by suspension-emulsion combined polymerization

Author

Zhang Zhenqian, Weng Zhi-xue, Huang Zhi-ming, and Bao Yongzhong

Subjects
Materials science, Polymers and Plastics, Radical polymerization, technology, industry, and agriculture, Emulsion polymerization, macromolecular substances, General Chemistry, Poly(methyl methacrylate), Surfaces, Coatings and Films, chemistry.chemical_compound, chemistry, Polymerization, Chemical engineering, visual_art, Polymer chemistry, Materials Chemistry, Copolymer, visual_art.visual_art_medium, Suspension polymerization, Polystyrene, Methyl methacrylate
Abstract

Suspension-emulsion combined polymerization process, in which methyl methacrylate (MMA) emulsion polymerization constituents (EPC) were drop wise added to styrene (St) suspension polymerization system, was applied to prepare polystyrene/poly(methyl methacrylate) (PS/PMMA) composite particles. The influences of the feeding condition and the composition of EPC on the particle feature of the resulting composite polymer particles were investigated. It was found that PS/PMMA core-shell composite particles with a narrow particle size distribution and a great size would be formed when the EPC was added at the viscous energy dominated particle formation stage of St suspension polymerization with a suitable feeding rate, whereas St-MMA copolymer particles or PS/PMMA composite particles with imperfect core-shell structure would be formed when the EPC was added at the earlier or later stage of St suspension polymerization, respectively. It was also showed that the EPC composition affected the composite particles formation process. The individual latex particles would exist in the final product when the concentrations of MMA monomer, sodium dodecyl sulfate emulsifier, and potassium persulfate initiator were great in the EPC. Considering the feature of St suspension polymerization and the morphology of PS/PMMA composite particles, the formation mechanism of PS/PMMA particles with core-shell structure was proposed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

Published
2009

4. A molecular weight model in vinyl chloride–divinyl monomer suspension copolymerization before the gel point

Author

Luo Yingwu, Weng Zhi-xue, Huang Zhi-ming, and Pan Zuren

Subjects
Gel point, Polymers and Plastics, General Chemistry, Vinyl chloride, Surfaces, Coatings and Films, chemistry.chemical_compound, Chain length, Monomer, chemistry, Chemical engineering, Polymerization, Polymer chemistry, Materials Chemistry, Copolymer, Molar mass distribution, Suspension (vehicle)
Abstract

In this paper, a molecular weight model in the vinyl chloride (VC)–divinyl monomer suspension copolymerization was derived from the mechanism of VC two-phase polymerization, with pseudokinetic constant method and the theory of the moments of chain length distribution. Furthermore, the behavior of average polymerization degree was simulated with the model at varied experimental parameters. The simulation phenomena were discussed in detail. It is concluded that our model can be useful to predict the behavior of DPw and to look inside the crosslinking mechanism in the VC–divinyl monomer copolymerization. © 1995 John Wiley & Sons, Inc.

Published
1995

9. Wuweizidilactones A–F: Novel Highly Oxygenated Nortriterpenoids with Unusual Skeletons Isolated from Schisandra chinensis

Author

Huang, Sheng‐Xiong, primary, Yang, Li‐Bin, additional, Xiao, Wei‐Lie, additional, Lei, Chun, additional, Liu, Jing‐Pin, additional, Lu, Yang, additional, Weng, Zhi‐Ying, additional, Li, Li‐Mei, additional, Li, Rong‐Tao, additional, Yu, Jun‐Lin, additional, Zheng, Qi‐Tai, additional, and Sun, Han‐Dong, additional

Published
2007
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11. Cytotoxicent-Kauranoids fromIsodon parvifolius

Author

Li, Li-Mei, primary, Li, Guo-You, additional, Li, Sheng-Hong, additional, Weng, Zhi-Ying, additional, Xiao, Wei-Lie, additional, Han, Quan-Bin, additional, Ding, Li-Sheng, additional, Lou, Li-Guang, additional, and Sun, Han-Dong, additional

Published
2006
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