New insights into urethane alcoholysis enable chemical full recycling of blended fabric waste

Abstract

Accumulation and mishandling of post-consumer polymers have created environmental concerns worldwide. Chemical recycling represents a promising strategy by converting waste polymers into valuable monomers, fuels or chemicals. However, due to...

Chemically recyclable and mechanically robust non-isocyanate polyurethanes from resveratrol

“…The proton signals from N-H (δ = 4.67 ppm) and -CH 3 (δ = 3.66 ppm) proved the formation of methyl butyl carbamate (MBC) (Fig.9c), which was in agreement with the degradation experiments of RE-PHUs. Based on the experiments and previous reports,38 the degradation of RE-PHUs may undergo the following mechanism: the attack of Na + on the CvO in carbamate protonated it, resulting in CvO being more susceptible to nucleophilic attack by methanol; meanwhile, OH − slightly deviated the hydrogen atoms in methanol, making oxygen atoms in methanol more negatively charged and easier to attack carbon atoms in CvO. As shown in Scheme S3, † the degradation process mainly included the activation of carbonyls, nucleophilic attack of methoxy, and elimination of leaving groups.…”

Fabrication of a tough, long-lasting adhesive hydrogel patch via the synergy of interfacial entanglement and adhesion group densification

“…The efficient grafting of CNC with the acrylic polymer was realized by our team 24,25 by using a synergistic initiation system of ceric ammonium nitrate (CAN) and sodium citrate (SC) (Fig. S1-S3 †).…”

A new strategy for efficient chemical degradation and recycling of polyurethane materials: a multi-stage degradation method

“…S5 ‡) to obtain the reaction rate constant k for each temperature (Fig. 2b), 18,46,47 which was then plotted on an Arrhenius plot to determine the activation energy of 104.1 ± 3.9 kJ mol −1 (Fig. 2c).…”