New catalytic systems for the fixation of carbon dioxide. 1. Copolymerization of carbon dioxide and propylene oxide with new rare-earth catalysts-RE(P204)3-Al(i-Bu)3-R(OH)n

A new copolymerization process leading to poly(propylene carbonate) with a highly enhanced yield from carbon dioxide and propylene oxide

“…According to the previous studies, 15,23,30,31,32,37,45,47,50 both yield and molecular weight in the copolymerization depend upon CO 2 pressure, temperature, and time. In general, both the yield and molecular weight increase with increasing CO 2 pressure up to 15-20 atm and then level off.…”

“…In addition, intrinsic viscosity [] measurements were carried out in benzene at 35.0°C using an Ubbelohde suspended level capillary viscometer as described previously in the literature. 15,16,29,45,47 All the solutions were filtered through 0.5 m Fluoropore filters (Millipore Co.) before measurement. For a given polymer product, the relative and specific viscosities were measured at four different concentrations over the range of 0.10 -1.00 g/dL, and the [] value was determined by extrapolation of the reduced and inherent viscosities to the infinite dilution.…”

Copolymerization of carbon dioxide and epoxide

“…Shen et al 65 have reported that the rare-earth phosphonate (13)-triisobutylaluminum-glycerol system was reported to be effective for the copolymerization of carbon dioxide and propylene oxide. Among the rare-earth phosphonates examined, yttrium phosphonate showed the best result.…”

Thermal decomposition studies of highly alternating CO2- cyclohexene oxide copolymer

“…The aliphatic polycarbonates, such as poly(ethylene carbonate), poly(propylene carbonate) and poly(cyclohexene carbonate), can be obtained from the copolymerization of carbon dioxide and epoxides with various catalysts [1][2][3][4][5][6][7]. It is well known that poly(ethylene carbonate) (PEC) has good bio-compatibility and biodegradability and can be used as surgery seam [8][9][10].…”