超临界CO_2中MCM-41-g-PHEMA介孔复合物的制备及性能

以甲基丙烯酸羟乙酯(HEMA)为单体,用乙烯基三乙氧基硅烷改性的介孔分子筛MCM-41为载体,偶氮二异丁腈为引发剂,在超临界二氧化碳中通过沉淀聚合,成功合成了聚甲基丙烯酸羟乙酯-二氧化硅介孔复合材料(MCM-41-gPHEMA)。考察了反应物配比、反应时间和反应压力对所制复合物形貌与产率的影响。对所合成的复合物进行红外光谱分析、比表面积、小角X射线衍射、扫描电镜、透射电镜、热重分析等表征。研究了复合物的溶胀性及在不同pH下对牛血清白蛋白(BSA)水溶液的吸附性能与吸附动力学。结果表明,MCM-41-g-PHEMA的孔径约为6.3nm,热稳定性明显提高,复合物对BSA的吸附动力学符合伪二级速率方程,最大吸附量为35mg/g。

Preparation and Properties of Poly(2-hydroxyethylmethacrylate)-silica Mesoporous Composite in Supercritical Carbon Dioxide

Poly (2-hydroxyethylmethacrylate)-silica mesoporous composite (MCM-41-g-PHEMA) was successfully synthesized by precipitation polymerization in supercritical carbon dioxide with 2-hydroxyethyl methacrylate (HEMA) as monomer,vinyl triethoxy silane modified the mesoporous molecular sieve MCM-41 as carrier,azoisobutyronitrile as initiator.The effects of reactant ratio,reaction time and pressure on the morphology and yield of the complexes were investigated.The synthesized composites were characterized through FT-IR,BET,small angle XRD,SEM,TEM,TGA,etc.The swelling of the composites and adsorption property of bovine serum albumin (BSA) in different pH of aqueous solution as well as adsorption kinetics were studied.The results show that the pore size of MCM-41-g-PHEMA is about 6.3nm,the thermal stability is improved obviously,and the adsorption kinetics of the complex on BSA is in accordance with pseudo two order rate equations.The maximum adsorption capacity is 35 mg/g.