Fatty Acid Methyl Ester Fixed Co₂ Synthetic Polyester Material

With the continuous advancement of technology,the development and attention of polyester materials in China has been continuously improved,and it has become an important intermediate for connecting petrochemical products and products in many industries.Different polyesters are prepared by different methods,such as transesterification polycondensation,direct esterification polycondensation,and ethylene oxide.For the market demand of polyester materials,it is mainly used in the insulation materials,packaging materials,building materials,drug slow release materials and intermediates for the production of fine chemicals.Due to its low cost,availability,richness,and safety and non-toxicity,C02 has become a good substitute for fossil resources.The fatty acid methyl ester is extracted from vegetable oil and has the advantage of low chemical toxicity compared to other chemical structures.The subject mainly aims to obtain a cyclic carbonate monomer by immobilizing C02 on the epoxide of vegetable oil,and further synthesizes a polyester material having different mechanical properties and biocompatibility by copolymerization of diflferent proportions of monomers.The subject is mainly divided into three parts:First,the unsaturated double bond of fatty acid methyl ester was epoxidized by using hydrogen peroxide aqueous solution as oxidant.The optimum reaction conditions were determined by a single variable method for gradient optimization experiments.The conversion rate was as high as 96.79%,and the epoxy value was as high as 5.025.The epoxy fatty acid methyl ester was increased by 20.2%.Secondly,the MOF material was used as a catalyst to fix the CO2 to the epoxy fatty acid methyl ester to obtain a cyclic carbonate monomer,and the conversion rate was as high as 94.43%.Third,the lactone ring-opening polymerization was carried out.The mechanism copolymerizes the cyclic carbonate monomer with different proportions of lactone monomers,thereby adjusting the mechanical properties and biodegradability of the polyester material according to different needs.When the ratio of the two monomers is 3:7,the molecular weight is maximum 25786 g/mol.