Monodisperse Poly (4-vinylpyridine-co-divinyl benzene/trimethylolpropane trimethacrylate) Microspheres Prepared via Precipitation Polymerization

文献类型： 外文期刊

第一作者： Lu, Chun-xia

作者： Lu, Chun-xia;Tang, Zong-gui;Wang, Jing;Luo, Zhi-gen;Chen, Xia;Li, Hong-min

作者机构：

关键词： Precipitation polymerization;Polymer microspheres;4-Vinylpyridine;Divinyl benzene;Trimethylolpropane trimethacrylate

期刊名称：ACTA POLYMERICA SINICA （ 影响因子：2.0； 五年影响因子：1.391 ）

ISSN： 1000-3304

年卷期： 2016 年 11 期

页码：

收录情况： SCI

摘要： Monodisperse poly-(4-vinylpyridine-co-divinyl benzene/trimethylolpropane trimethacrylate) (poly(4-VP-co-DVB/TRIM)) microspheres with smooth surface were successfully prepared by precipitation polymerization in acetonitrile with 4-vinylpyridine (4-VP), divinyl benzene (DVB) and trimethylolpropane trimethacrylate (TRIM) as comonomers, 2,2-azobisisobutyronitrile (AIBN) as initiator. Effects of the polymerization conditions, such as comonomer ratio, solvents and initiator amount, on the morphology and yield of polymer microspheres were also investigated. The prepared polymers were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA) and particle size analysis. Results showed that polymerization parameters (including solvent type and amount, molar ratio, of cross-linker to comonomer, ratio of the cross-linkers DVB to TRIM and initiator concentrations) had significant influence on the morphologies and yield of the resulting polymer microspheres. Particle size and uniformity of polymer increased with decreasing acetonitrile amount while increases in cross-linker and initiator loading caused larger particle sizes. The polymer yield increased gradually with the increases in the concentration of initiator and molar ratio of cross-linker, and decreased with the increase in the amount of the acetonitrile and molar ratio of cross-linker. When molar ratio of 4-VP: (DVB + TRIM) was 1:5 and DVB: TRIM was 4: 1, with 2 wt% 6 wt% of AIBN as initiator (based on all monomer weight), 5. 6 mL of acetonitrile as solvent, reaction temperature at 65 degrees C, reaction time for 24 h, monodisperse poly-(4-VP-co-DVB/TRIM) microspheres with better spherical shape and high yields were obtained, and the average diameters and polydispersity index of the polymer microspheres were 4. 02 m and 1. 024, respectively. Moreover, thermal gravimetric analysis showed that the weight loss for polymer microspheres in the temperature range of 320 500 degrees C, and 84. 9% of its initial mass was lost at 600 degrees C, which gave the polymer microspheres great potential to be used as functional materials.

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