New strategies for synthesis of amino‐functionalized poly(propylene carbonate) over SalenCo^(III)Cl catalyst

Abstract

New strategies for synthesis of amino‐functionalized poly(propylene carbonate) (PPC) were applied by terpolymerization of carbon dioxide, propylene oxide, with (a) N‐(2,3‐epoxypropyl)‐2‐phthalimide (Monomer A)/N‐(2‐oxiranylmethyl)‐1 or (b) N‐(2‐oxiranylmethyl)‐1,1‐dimethylethyl ester (Monomer B) over SalenCo(III)Cl/PPNCl catalysts system, followed by the removal of the respective protecting groups. The SalenCo(III)Cl presented high activity and yielded the terpolymer with high polycarbonate selectivity, carbonate linkage content, as well as high head‐to‐tail stereoregularity (>99%). In terpolymerization, the Monomer A contents in PPC‐Pht were easily regulated up to 12.0 mol%. However, the protecting groups could not be completely removed because of the degradation of PPC‐NH2‐A during the deprotection process. Meanwhile, when terpolymerization with Monomer B, PPC‐butoxy carbonyl was obtained varied the Monomer B contents from 1.3 to 4.5 mol%, and could be transformed completely into the amino‐functionalized PPC‐NH2‐B without significant backbone degradation. The contact angles of the functionalized PPC‐NH2s prepared by two strategies showed the expected increase in hydrophilicity with the increasing content of amino entities.

Research and Application of Polypropylene Carbonate Composite Materials: A Review

“…Chemical modification requires the introduction of appropriate units into the polymer, starting from the microstructure, so that a chemical reaction can take place to copolymerize the molecular chain structure [ 111 , 112 ]. Chemical modification methods include terpolymerization, capping, cross linking, chain transfer, block copolymerization and graft copolymerization [ 113 , 114 , 115 ]. Chemical reagents may affect the environmental friendliness of PPC and are therefore not described in this paper.…”

Synthesis of new aliphatic poly(ester‐carbonate)s bearing amino groups based on photolabile protecting group and evaluation of antibacterial property

“…Besides, when functional groups are incorporated into the polymer backbones; the potential applications will be further broadened. For example, the introduction of hydroxyl, 6–9 carboxyl, 10,11 and amino groups 12–19 can effectively tunning the hydrophilic properties. Pendant functional groups may also provide active sites for further modification such as crosslinking, attaching bioactive substances to satisfy more specific applications 3,4,20,21 .…”