Systhesis Of Polymetharylate High Oil Absorbent Resins

The structure and oil-absortive properties of high oil absorbent resins, copolymerized by styrene and metharylate esters, were studied in this thesis. By incorporating of weakly coordinatng anions into the polymer compound, we also groped for applications of poly(ionic liquids) as absorbents.First of all, the suspension polymerization of styrene (St) and variable metharylate esters (stearyl methacrylate (SMA), lauryl methacrylate (LMA) and butyl methacrylate (BMA)) was carried out to prepare binary copolymerized oil absorbent resins (BCR). The influences of dispersants, initiators, crosslink agents, feed ratios of monomers, temperature, water-oil ratio and variable alkyl side-chain lengths on the structure and oil-absorptive properties of high oil absorbent resins were studied, and the recipes and operation conditions were optimized as follows: LMA as lipophilic monomer and the ratio of LMA to St was 20:80 wt%, 1.0wt% divinylbenzene (DVB) crosslinker, 1.5wt% benzoperoxide (BPO) initiator at 85℃, Hydroxyethyl cellulose (HEC) and gelatin as dispersion agents and the ratio of HEC to gelatin was 0.07:0.14 wt%, The water phase to oil phase ratio was 3:1. The maximum oil absorbency to carbon tetrachloride, dichloromethane, xylene were 15.6, 12.4, and 9.0g/g, respectively.Ternary copolymerized oil absorbent resins (ECR), consisting of SMA, BMA and St, were synthesized to construct a kind of three dimensional network with excellent compatibility to oil. The structure of ECR was analyzed by FTIR, and comparison of surface morphology and glass transition behavior between BCR and ECR was made by SEM and DSC technique. Results indicated that feed ratio of"hard-segments"(made up of St) and"soft-segments"(made up of SMA and BMA) affected the compatibility of the three dimensional network and oil. The resins would perform optimum combiation oil-absorptive properties when the feed ratio of St was 45wt% and the proportion of SMA to BMA was 1:1, which makes the three dimensional network to have a hard framework and easily to relax and extend. The maximum oil absorbency to dichloromethane and xylene were 20.4, and 15.0g/g, respectively. Tetraalkylammonium cations and tetraphenylborate anions were incorporated into the polymer gels through the modifications of PS buliding block by chloromethylation, quaternary ammoniation and couterion exchange reactions. The structure of lipophilic polyelectrolyte gels were analyzed by FTIR and NMR, and glass transition behavior was sudied by DSC technique. Results indicated that incorporation of too many ionic groups would cause physical crosslinking by higher aggregation of the ionic groups and consequently collapse of the gels. When the content of the ionic groups in the polymer chains was 2.64wt%, the maximum oil absorbency to dichlorometane and oil solution (crude oil diluted with toluene, 10wt% oil) were 28.4g/g and 16.0g/g, respectively.