Influence of Polymer Dispersants on Dispersion Effect of Polymethyl Methacrylate Microspheres by Dispersion Polymerization

被引：0

作者：

Chunyu S. ^{[1
]}

Haitang S. ^{[1
]}

Xuelian H. ^{[1
]}

Yong J. ^{[1
]}

Zhifei W. ^{[1
]}

机构：

[1] School of Chemistry and Chemical Engineering, Southeast University, Nanjing

来源：

Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2023年 / 39卷 / 07期

关键词：

dispersant; dispersion polymerization; monodispersity; poly (methyl methacrylate) microsphere;

D O I：

10.16865/j.cnki.1000-7555.2023.0139

中图分类号：

学科分类号：

摘要：

With methyl methacrylate as polymerization monomer and 2,2’- azobisisobutyronitrile as initiator, polymethyl methacrylate (PMMA) microspheres with the particle size of 1~2 μm were prepared by dispersion polymerization in methanol/water medium. The effects of four macromolecular dispersants on the particle size and monodispersity of PMMA microspheres were examined and their influencing mechanisms were discussed. The chemical composition and morphology of the microspheres were characterized by Fourier- transform infrared (FT- IR) spectroscopy and scanning electron microscopy, the results show that different dispersants have significant effect on the size and distribution of microspheres. When polyvinyl alcohol (PVA) is used as dispersant, the system is easily destabilized, resulting in particle sedimentation and small particles，the average diameter of microsphere (Dn) is 1.2μm, polydispersity index (PDI) is 0.045. The monodispersity of the microspheres with polyvinylpyrrolidone as dispersant is poor, and the system will also produce particle aggregation and sedimentation, Dn is 1.45μm, PDI is 0.105; with polyacrylic acid (PAA) as dispersant, poorer monodispersity is obtained, Dn is 1.85 μm，PDI is 0.3; while polyethylene glycol (PEG) is used as dispersant, uniform microspheres are obtained, Dn is 1.15 μm，PDI is 0.041. The particle size and polydispersity index of microspheres decrease first and then increase with the increase of PEG molecular weight; the particle size also increases first and then decreases with the increase of PEG concentration, and decreases with the increase of PEG concentration after the addition of more than 20%. The changing trend of PDI with PEG concentration is basically consistent with the particle size. © 2023 Chengdu University of Science and Technology. All rights reserved.

引用

页码：1 / 7

页数：6

共 10 条

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