微乳液聚合制备多孔高吸油甲基丙烯酸酯类树脂的研究

研究了双连续相微乳液聚合制备多孔高吸油树脂,以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)为共聚单体(油相),水(H2O)/乙醇(EtOH)为混合水相,2,2′-偶氮二异丁腈(AIBN)为引发剂,采用十二烷基硫酸钠(SDS)和复配十二烷基硫酸钠/吐温80(SDS/T80)两种乳化体系,调节油相和水相比例,配制出双连续相微乳液.聚合在无搅拌下进行.研究了乳化体系、混合水相含量、单体配比、交联剂和引发剂用量等因素对树脂吸油性能的影响.结果表明,多孔高吸油树脂比同系无孔树脂的吸油速率大大提高,最快可以在2min内达到吸油饱和.树脂对苯,四氢呋喃,四氯化碳的吸油倍率分别达到15.5g/g,15.5g/g,31.7g/g.

PREPARATION OF POROUS HIGH OIL-ABSORPTION METHACRYLATE RESIN WITH MICROEMULSION POLYMERIZATION

Porous high oil-absorption resin was successfully prepared via bicontinuous microemulsion polymerization.The main aims of this paper are trying to control the pore structure of the polymer.The emulsifier system,including an anionic surfactant sodium dodecyl sulfate (SDS),an anionic-nonionic mixture of sodium dodecyl sulfate ( SDS ) and Tween 80 ( T80 ),could be used to prepare stable,transparent microemulsion.The microemulsion phase diagrams of the system consisting of surfactants,H2O /EtOH and MMA /BA are shown.The resulting polymers were studied by SEM.The oil-absorption property of the resin was determined.The effects of emulsion system,the content of aqueous phase,ratio of monomers,the content of crosslinker and initiator on oil absorption capacity of the prepared resin were disussed.The SEM results indicated the formation of a bicontinuous structure in the high oil-absorption resin at mixture aqueous concentrations between 30 wt% and 50 wt% .The pore size or the width of the polymerized bicontinuous microemulsions increased substantially with the increase of the aqueous content ( 30 wt% ～ 50 wt% ) in precursor microemulsions.This total polymerization approach enables one to synthesize various bicontinuous nanostructures polymeric materials by simply adjusting the concentrations of aqueous in precursor bicontinuous microemulsions.The results indicated that the porous high oil-absorption resin could reach oil balance in two minutes with aqueous content 50 wt% .The oil-absorption in benzene,tetrahydrofuran,carbon tetrachloride can reach 15.5 g /g,15.5 g /g,31.7 g /g to the most,respectively.