Design,Synthesis And Properties Of Novel Carbon Dioxide Elastomers

Carbon dioxide is the main cause of the greenhouse effect.At present,the petrochemical industry produces a large amount of carbon dioxide which is much higher than the photosynthesis carbon dioxide consumption of plants.Therefore,the chemical synthesis of carbon dioxide into a polymer material can not only alleviate The harm caused by the greenhouse effect,but also can turn waste carbon dioxide into treasure,to meet the requirements of green chemistry and the concept of sustainable development.In recent years,it has been reported at home and abroad that a variety of carbon dioxide plastics have been successfully synthesized by copolymerizing carbon dioxide with epoxidized monomers,but there is no report about carbon dioxide elastomers.In this paper,allyl glycidyl ether(AGE)and glycidyl methacrylate(GMA)were used as carbon dioxide comonomers.The long-chain branch structure was used to destroy the regularity of the molecular chain,while maintaining the high flexibility of the main chain.Final synthesis of a new carbon dioxide-based elastomer material.The catalyst is the core of the reaction between carbon dioxide and epoxidation monomer.Therefore,in the second chapter of this thesis,the preparation of the catalyst suitable for the copolymerization of AGE/GMA and carbon dioxide is studied.In this study,two kinds of catalysts were prepared.One is ternary rare earth trichloroacetic acid-glycerol-diethyl zinc catalyst,and the other is rare earth-free glycerol-diethyl zinc binary catalyst.The X-ray electron energy can be obtained.Spectral analysis of the surface binding energy of the comparative analysis of its possible structure and catalytic mechanism,found that triterpenoid trichloroacetic acid-glycerol-diethyl zinc rare earth catalyst is more suitable for AGE/GMA and carbon dioxide copolymer system.In the third chapter,the synthesis of CO2-AGE copolymers was successfully synthesized by anion coordination polymerization method using a synthetic terbium trichloroacetic acid-glycerol-diethyl zinc rare-earth rare earth as the catalyst.The glass transition temperature Tg of the obtained copolymer was-38?,an amorphous form,is a new type of carbon dioxide elastomer.The structure of the copolymer was characterized by FT-IR and 1H NMR,and the binary copolymerization reaction conditions were optimized by changing the polymerization pressure,temperature and reaction time.The content of carbonate chain and the polyether bond in the copolymer were studied.The effect of section content.The results show that when the polymerization pressure is 4MPa,the temperature is 80?,and the reaction time is 18h,the copolymer has the highest content of carbonate chain and the highest utilization rate of carbon dioxide.In addition,using the synthetic carbon dioxide elastomer as raw material,through the general rubber processing method,its vulcanization characteristics were analyzed,and its graft modification research.On the basis of the third chapter,the fourth chapter introduces the third monomer GMA in the CO2-AGE copolymerization structure,which further destroys the regularity of the molecular chain,and uses its effect of the competition polymerization to increase the molecular weight of the polymer.The CO2-AGE-GMA terpolymer was successfully prepared by anionic coordination polymerization.The results showed that the number average molecular weight was about 6000 higher than that of the binary copolymer,and the glass transition temperature Tg was about-48?,which was than that of the binary copolymerization about 10? lower.