Premium
Copolymerization of carbon dioxide and propylene oxide catalyzed by two kinds of bifunctional salen‐cobalt(III) complexes bearing four quaternary ammonium salts
Author(s) -
Du Longchao,
Wang Chengze,
Zhu Weiju,
Zhang Jie
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201900077
Subject(s) - chemistry , propylene oxide , bifunctional , copolymer , catalysis , cobalt , polymer chemistry , propylene carbonate , ammonium , medicinal chemistry , inorganic chemistry , organic chemistry , polymer , electrochemistry , ethylene oxide , electrode
Two new bifunctional salen‐cobalt(III) complexes were synthesized, which consist of salicylaldehyde bearing four quaternary ammonium salts and two different diamines. The copolymerization results indicated that decreasing temperature is advantageous for both the complexes. Of both the diamines, the complex 9 with o ‐diaminobenzene has a higher catalytic effect compared to complex 6 with 1,2‐diaminocyclohexane. The catalytic effect of complex 9 is over 3.5 times than that of complex 6 at a temperature of 30°C. The research of P CO2 on the copolymerization revealed that the first‐rank pressure was at 2 MPa for the two complexes. The highest turnover number are under conditions of T = 30°C, P CO2 = 2 MPa, and t = 24 hr. Differential scanning calorimeter curves indicated that poly(propylene carbonate) (PPC) by complex 9 has the highest Tg of 54.2°C. DTGA curves showed that there were two thermal degradation peaks, the first is for the ester bond, and the second is for the C–C bond.