Method for preparing crosslinked polypropylene carbonate (PPC) by one-pot method of copolymerization of maleic anhydride homopolymer/epoxypropane (PO)/carbon dioxide (CO2)

• Main Authors: LIANG XIANGJUN, XIAO ZHENYUAN, GAO LIJUN, FENG JIUYING, HUANG MEIYING
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2019
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a method for preparing crosslinked polypropylene carbonate (PPC) by a one-pot method of copolymerization of maleic anhydride homopolymer/epoxypropane (PO)/carbon dioxide (CO2)and belongs to the field of CO2 copolymer materials. A maleic anhydride homopolymer is introduced into the polymerization of CO2 and PO to prepare the crosslinked PPC by the one-pot method. In molecules of a third monomer, the maleic anhydride homopolymer that has a crosslinking function, the number of cyclic carboxylic acid anhydride functional groups that can participate in the CO2/PO polymerization is adjustable to adjust the degree of crosslinking and physical properties of the obtained crosslinked PPC. The introduction of the maleic anhydride homopolymer not only increases the catalyticefficiency, reduces the pressure of CO2 and shortens the time of polymerization. In addition, the maleic anhydride homopolymer is added in an amount which is less than 5% of the weight of PO, which significantly enhances the t