The Room Temperature Polymerization of Propylene Oxide

Grignard-based anionic ring-opening polymerization of propylene oxide activated by triisobutylaluminum

“…Polystyrene was used as the standard. 1 H and 13 C NMR analyses of the polymers were performed on a Bruker Avance 400 spectrometer in CDCl 3 at room temperature.…”

“…Polyethers are conventionally prepared by anionic ring-opening polymerization using alkali metal derivatives [1,2]. Potassium or cesium hydroxides or alkoxides are well-known candidates as initiators for the synthesis of polyethers [3][4][5][6][7].…”

Valorization of Lignin as a Sustainable Component of Structural Materials and Composites: Advances from 2011 to 2019

“…Oxypropylation was used as an effective effort to enhance the reactivity, as lignin is reacted with propylene oxide to form aliphatic ligno-polyol derivatives and polypropylene oxide (Scheme 2) [18]. Introducing multiple ether units as chain extenders also served to liquify the solid lignin (Tg = −75 • C), minimizing the technical issues in processability [19][20][21][22]. In most formulations for PU (polyurethane) foams, the resultant polypropylene oxide homopolymer is separated from the mixture before reacting with isocyanate monomers.…”

Solid state13C andin situ1H NMR study on the effect of melamine on the thermal degradation of a flexible polyurethane foam

“…In relation to the polyol component, Costa et al 16 showed that the thermal decomposition of the PPO sequence starts at 360 °C by random homolytic scission of CO and CC bonds producing propane aldehydes, alcohol ethers and glycols as products. Madorsky and Straus17 and St Pierre and Price18 studied the thermal degradation of PPO polymers, and identified the decomposition products as low molecular weight hydrocarbons, ketones, aldehydes and ethers. Under thermo‐oxidative conditions, PPO is greatly destabilized, and hydroperoxides are formed at low temperatures (100–140 °C) through a radical chain mechanism.…”