A new route for the synthesis of propylene oxide from bio-glycerol derivated propylene glycol

Abstract

The synthesis of propylene oxide from propylene glycol, a derivative of bio-glycerol, was firstly realized in the presence of alkali-loaded silica catalysts to achieve 44% conversion and 70% selectivity.

Thermal and weathering degradation of poly(propylene carbonate)

“…They detected the vinyl-end group not only chemically using Br 2 or KMnO 4 but also using IR spectroscopy. On the contrary, the vinyl-end group is not detected either in the sample treated at 200 C or in the sample stored in the weathering chamber for 2000 h. So, we propose that the formation of significant amount of low molecular weight fractions in the weathering chamber is due to the chain scission by water (equation (5)). Humidity of the chamber is controlled at a level of 50 AE 3%.…”

“…2. So, the main degradation process in the thermal treatment is not a chain scission by water, as shown in equation (5). If the main degradation process is the attack of the chain-ended hydroxyl group onto a carbonate linkage in polymer backbone (equation (4)), simultaneous formation of a high molecular-weight chain and a low molecular-weight chain should be observed.…”

“…While most of polymers used in daily life are derived from petroleum, PPC is composed of 44% CO 2 by weight. Recently, a preparation route of propylene oxide (PO) from a renewable resource, glycerol, was reported [5]. PPC burns gently in air without emitting any toxic materials and without producing an ash residue.…”

Terpolymerizations of CO2, Propylene Oxide, and Various Epoxides Using a Cobalt(III) Complex of Salen-Type Ligand Tethered by Four Quaternary Ammonium Salts

“…Recently, a preparation route for PO was reported from a renewable resource, glycerol. 10 The copolymer burns gently in air without emitting toxic materials and adheres strongly to a cellulosic substrate. The barrier property for O 2 and water is also good as a film.…”

Tandem catalysis: a new approach to polypeptides and cyclic carbonates

“…of g-benzyl-L-glutamate N-carboxyanhydride (GluNCA) and an excess of propylene oxide (PO), which was used as a solvent. [37][38][39] Satisfyingly, the Al(salen) complex was an active initiator for the ROP of GluNCA to afford poly(g-benzyl-L-glutamate) (PBLG) with high numberaverage molecular masses (M n = 25 000 g mol À1 ) and relatively broad molecular weight distribution (Table 1, entry 1). As already demonstrated by Bertrand, 40 this result demonstrates that the active species is an alkoxide complex resulting from the insertion of PO into an Al-Cl bond.…”