Copolymerization Of Epoxides And Cyclic Anhydrides And Modification Of Polyesters

With the development of science and technology, people's demands towardsresources are gradually increasing day by day. Unfortunately, the resources in the earth arebecoming less and less, so that the high-performance macromolecule materials are paidmore and more attention, especially for functional materials. As the environment-friendlypolymer, is widely applied in the field of biological medicine. The syntheses of ring-opencopolymerization of cyclic anhydrides with epoxides, which can produce functional groupsof polyester is an efficient method for synthesis of polymers. However, this method is notsatisfactory. There are still some problems, for example, the choice of catalysts and itspoor activity, the larger ratio of polyether as well as the less molecular weight and thewider molecular weight distribution and so on. Therefore, the exploiting of designing afriendly and high-efficiency catalysts and a new reactive method to generate polyesters byring-open copolymerization of cyclic anhydrides and epoxides has become a hot topic forresearch.The present thesis researched the ring-open copolymerization of polyester of cyclicanhydrides and epoxides by zinc glutarate as a catalyst. Meanwhile, the property of thisnew polymer is chemically modified to improve its applying range.The one part: the research on ring-opening copolymerization of several cyclicanhydrides and epoxides by zinc glutarate to synthesize polyester, whose molecular weightdistribution is relatively narrower. The activities of the different cyclic anhydrides areGAn> SAn> PAn> MAn in the reactive system. And ZnO has better catalytic activity forMAn and ECH compolymerizayion,Under the different reactive conditions on thecopolymerization, the results show that the optimum of the monomer morar ratio ofMAn:PO:ZnO is16:14:1,the temperature is100?and the time is24h.The two part: the study on ring-opening copolymerization of allyl glycidyl ether andsuccinic anhydride by zinc glutarate to synthesize the Side chain with carbon carbondouble bond unsaturated polyester, whose molecular weight is4000-6000and molecularweight distribution index is1.03-1.66. And study the influence of the polymerization bythe introduction of propylene oxide, the results shown that the content of the AGE decreasewith increasing of the propylene oxide, but the monomer conversion rate almost unchanged. Utilizing thiol-ene click reaction to modify the polyesters, the result thatdouble bond of side chain of conversion rate reached100%.The three part: The study on ring-opening copolymerization of different acidanhydrides(MAn,PAn,SAn) and epichlorohydrin by zinc glutarate to synthesize containingchloric compound, the Mn of the polyester molecule achieved4.6×103.And investigatingthe several catalysts on the copolymerization, the result that all of the catalysts havecertainly shown a catalytic activity for MAn and ECH, and the polyester formed partcross-linking structure. The PMAECH never appeared the cross-linking structure under thetemperature below80?, the reaction time less than7h; while, When reaction conditionunder higher than110?and24h, the P (MAECH) show the corresponding crosslinking phenomenon, which may caused by the double bond and the chlorine monomer.The four part: Successful synthesized graft polymer PSAECH-g-St,PSAECH-g-MMA and PSAECH-g-AA using the two different ways of thermalcopolymerization and ATRP. And investigating under the several times and temperatureson the copolymerization, the result show that with the increase of temperature, themonomer conversion and grafting rate also will increase and with the increase of reactiontime, the homopolymerization rate increases as well as the speed of the grafting rate is high,more conducive to the homopolymerization of styrene monomer.