Polycarbonate (PC) can be divided into aliphatic, alicyclic, aromatic, etc.
, but limited by factors such as processing performance and production cost, only bisphenol A aromatic polycarbonate can be industrially produced on a large scale
.
There are many synthetic methods of polycarbonate, such as low temperature solution polycondensation method, high temperature solution polycondensation method, pyridine method, solution phosgene method, interface polycondensation method, melt transesterification method,
etc.
At present, it has been industrialized, and there are two main methods of large-scale production: according to the principle of chemical reaction, it can be divided into interface polycondensation method and melt transesterification method, and according to whether there is phosgene in the source of raw materials, it can be divided into phosgene method and non-phosgene method.
The core raw material is bisphenol A, which competes with epoxy resin for the relatively limited domestic spot resources of bisphenol A, resulting in a frequent surge in the market
.
The good news is that the domestic scientific research team has provided new ideas for the synthesis of polycarbonate
.
Under the funding of the National Natural Science Foundation of China and other projects, the team of Professor Li Zhibo of Qingdao University of Science and Technology has made progress in the organic catalytic synthesis of CO₂-based polycarbonate
.
The related research results are titled "Organocatalytic Copolymerization of CO₂ and Epoxides into Various Polycarbonates: From High Pressure and High Temperature to Mild Conditions", which was published online in German Applied Chemistry on November 4, 2021
.
CO₂ is one of the most attractive C1 renewable resources
.
The development of high-efficiency catalysts to achieve selective synthesis of CO₂-based polycarbonates at room temperature and pressure can reduce energy consumption and carbon emissions
.
The preparation of polymer materials with CO₂ as raw material has far-reaching significance for solving the two major environmental problems of greenhouse effect and white pollution
.
Copolymerization of CO₂ and Epoxy to CO₂-Based Polycarbonate Catalyzed by Organophosphazene/TEB
Recently, Li Zhibo's team developed new phosphazene catalysts: 2,4,6-tris[tris(dimethylamino)iminophosphine]-1,3,5-triazine (C3N3-Me-P3) and 2,4 ,6-Tris[tris(1-pyrrolidinyl)iminophosphine]-1,3,5-triazine (C3N3-Py-P3), and used for controlled alternating copolymerization of anhydrides and epoxides
.
The team further found that organophosphazene/triethylboron (TEB) can efficiently catalyze the copolymerization of CO₂ and epoxycyclohexane (CHO), and achieve ideal catalytic efficiency to fabricate high-performance polyurethane
.
This research enriches the organic catalytic system of CO₂ and epoxy copolymerization, especially the synthesis of CO₂-based polycarbonate under normal temperature and pressure conditions, which provides a new idea for the efficient conversion of CO₂
.
