马来酸酐改性多孔微球的制备及表征

为了提高多孔树脂微球的亲水性,扩大其应用范围,文章通过马来酸酐(MAH)与多孔苯乙烯-二乙烯基苯共聚微球悬挂双键的接枝聚合,制备了改性的多孔树脂微球。用扫描电镜、红外光谱法、酸碱滴定法等对产物进行了表征。考察了微球的交联度、引发剂、反应时间等因素对马来酸酐接枝率和改性微球形貌的影响。在以交联度55%的多孔微球为基球,基球与MAH质量比为5∶3,质量分数为3%的偶氮二异丁腈为引发剂,80℃、反应6 h时,制得了较好多孔形貌的改性微球。结果表明,马来酸酐为改性剂有利于保持多孔微球的多孔形貌。

Preparation and characterization of porous microsphere modified with maleic anhydride

To extend application and improve the hydrophilicity of porous resin microsphere,the modified resin microspheres were prepared by grafting maleic anhydride(MAH) onto porous poly(styrene-divinylbenzen) [P(St-DVB)] with pendant vinyl groups.The grafting products were characterized by infra-red spectra,scanning electron microscope and neutralization titration.The influences of microsphere crosslinking degree,different initiators agents and reaction time on the grafting degree of MAH onto P(St-DVB) were investigated.The modified microspheres accompanied with perfective porous structure were synthesized under the conditions of porous P(St-DVB) with 55% crosslinking degree as base material,the mass ratio 5 ∶3 of porous P(St-DVB) to MAH,monomer mass fraction 3% azodiisobutyronitrile(AIBN) as initiator,80 ℃ and reaction time 6 h.The results show that it benefits keeping the porous structure of porous microsphere by using MAH as modifier.