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过程工程学报 ›› 2015, Vol. 15 ›› Issue (4): 646-652.DOI: 10.12034/j.issn.1009-606X.215191

• 生化工程专栏 • 上一篇    下一篇

非水介质中表面引发接枝聚合法制备接枝微粒PMAA/SiO2及其对阿魏酸的氢键吸附性能

孟建 陈璐璐 李延斌 高保娇   

  1. 中北大学化学工程系 中北大学化学工程系 中北大学化工系 中北大学化工系
  • 收稿日期:2015-04-20 修回日期:2015-05-21 出版日期:2015-08-20 发布日期:2015-08-20
  • 通讯作者: 高保娇

Preparation of Grafted PMAA/SiO2 Particles in Non-aqueous Media by Surface-initiated Grafting Polymerization and Their Adsorption Property for Ferulic Acid

MENG Jian CHEN Lu-lu LI Yan-bin GAO Bao-jiao   

  1. Department of Chemical Engineering, North University of Chin Department of Chemical Engineering, North University of Chin Dept. Chem. Eng., North China University Department of Chemical Engineering, North University
  • Received:2015-04-20 Revised:2015-05-21 Online:2015-08-20 Published:2015-08-20
  • Contact: GAO Bao-jiao

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3

摘要： 以偶联剂γ-巯丙基三甲氧基硅烷(MPMS)对微米级硅胶微粒进行表面改性，制得表面键合巯基的改性微粒MPMS-SiO2. 在非水溶剂二甲基甲酰胺(DMF)中使偶氮二异丁腈(AIBN)与MPMS-SiO2表面的巯基(-SH)构成表面引发体系(-SH/AIBN)，实现甲基丙烯酸(MAA)在非水介质中的表面引发接枝聚合，制得接枝度为20 g/100 g的接枝微粒PMAA/SiO2，对其进行了表征，考察了主要因素对MAA表面引发接枝聚合的影响规律，研究了PMAA/SiO2对酚酸化合物阿魏酸的氢键吸附作用. 结果表明，-SH/AIBN可顺利引发MAA在非水介质中的接枝聚合，适宜条件为75℃，AIBN用量为单体质量的1.5%. 在PMAA/SiO2与阿魏酸分子之间可产生强氢键作用，包括高强度的多位点常规氢键与p型氢键，导致PMAA/SiO2对阿魏酸有强吸附力，吸附容量达266 mg/g. 质子性溶剂甲醇中的溶剂竞争吸附作用使阿魏酸的吸附容量降低，升高温度吸附容量降低.

关键词: 甲基丙烯酸, 硅胶, 接枝聚合, 氢键, 阿魏酸, 吸附

Abstract: Micron-sized silica gel particles were surface-modified with the coupling agent γ-mercaptopropyl trimethoxysilane (MPMS), and the modified MPMS-SiO2 particles with surface bonding of mercapto groups were obtained. In non-aqueous solvent dimethylformamide (DMF), a surface-initiating system -SH/AIBN was constructed by the mercapto groups on MPMS-SiO2 and azodiisobutyronitrile dissolved in the solution, and the graft-polymerization of methacrylic acid (MAA) in the non-aqueous solvent was realized, obtaining the grafted particles PMAA/SiO2. The grafted particles were characterized, and the effects of the main factors on the graft-polymerization of MAA examined. On this basis, the adsorption of grafted particles PMAA/SiO2 for ferulic acid as a phenolic acid compound with hydrogen bonding was tested. The results show that the -SH/AIBN can smoothly initiate the graft-polymerization on silica gel particles in a non-aqueous solvent, the suitable temperature is 75℃, and appropriate content of AIBN 1.5% of the monomer mass. There is very strong hydrogen bonding including the strong and multi-site common hydrogen bond and π type hydrogen bond, leading to a strong adsorption ability of the grafted particles PMAA/SiO2 for ferulic acid at 266 mg/g. In the protonic solvent, methyl alcohol, the competitive adsorption of the solvent on the grafted particles PMAA/SiO2 makes the adsorption capacity of ferulic acid to decrease, and raising the temperature also makes the adsorption capacity of ferulic acid to decrease.

Key words: methacrylic acid, silica gel particles, graft-polymerization, hydrogen bond, ferulic acid, adsorption

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