Abstract: A catalyst for oxidative carbonylation of methanol to obtain dimethyl carbonate, a preparation method and applications thereof are disclosed. The catalyst includes a carrier being a porous carbon-nitrogen material, and an active component being Cu, where the weight of Cu accounts for 5-15 wt % of the total weight of the catalyst. The catalyst exhibits good catalytic activity in the reaction of methanol oxidative carbonylation to synthesize dimethyl carbonate, has high space-time yield and selectivity, and the catalyst and the product are easy to separate.

Abstract: An aliphatic copolycarbonate and a preparation method thereof are disclosed. The aliphatic copolycarbonate contains a structural unit represented by formula (1) and a structural unit represented by formula (2): where R1 is a C3-C10 alkylene group, and R2 is an alicyclic group. In the present disclosure, a specific alicyclic monomer is introduced into the aliphatic polycarbonate molecular chain to obtain a novel aliphatic copolycarbonate. The polymer in the present disclosure has properties such as relatively high melting point, glass transition temperature and thermal stability, and has better thermal properties.

Abstract: A preparing method of an aliphatic polycarbonate is provided to synthesize oligomer monomers by a transesterification reaction of carbonic acid dialkyl esters and aliphatic diols with accelerants in an atmosphere of a protective gas, and generate an aliphatic polycarbonate polymer by a polycondensation reaction of the oligomer monomers in a condition of high temperature and low pressure. According to the disclosure, environmentally friendly compounds with low boiling points and low costs are utilized as the accelerants to substitute the enzyme or acid-base catalysts to prepare aliphatic polycarbonate polymers in the prior art, and the cost is reduced; meanwhile, in the process of generating the aliphatic polycarbonate polymers, the accelerants can be removed from the reaction system along with the pressure reduced in the reaction system. The synthesis system is simple; moreover, the aliphatic polycarbonate obtained by the preparing method provided by the disclosure has merits such as superior colors.

Abstract: A preparing method of an aliphatic polycarbonate is provided to synthesize oligomer monomers by a transesterification reaction of carbonic acid dialkyl esters and aliphatic diols with accelerants in an atmosphere of a protective gas, and generate an aliphatic polycarbonate polymer by a polycondensation reaction of the oligomer monomers in a condition of high temperature and low pressure. According to the disclosure, environmentally friendly compounds with low boiling points and low costs are utilized as the accelerants to substitute the enzyme or acid-base catalysts to prepare aliphatic polycarbonate polymers in the prior art, and the cost is reduced; meanwhile, in the process of generating the aliphatic polycarbonate polymers, the accelerants can be removed from the reaction system along with the pressure reduced in the reaction system. The synthesis system is simple; moreover, the aliphatic polycarbonate obtained by the preparing method provided by the disclosure has merits such as superior colors.