Retraction: Non-thermal microwave effects in radical polymerization of bio-based terpenoid (meth)acrylates

Retraction of ‘Non-thermal microwave effects in radical polymerization of bio-based terpenoid (meth)acrylates’ by Thibault Castagnet, et al., Polym. Chem., 2020, 11, 6840–6846, DOI: 10.1039/D0PY01192D.

Non-thermal microwave effects in radical polymerization of bio-based terpenoid (meth)acrylates

Non-thermal microwave effects are operative for terpenoid acrylates but not for methacrylates, provided that a minimum irradiation power is applied.

Soft Microwave Pretreatment to Extract P-Hydroxycinnamic Acids from Grass Stalks

The aim of this article is to provide an analysis of microwave effects on ferulic and coumaric acids (FA and CA, respectively) extraction from grass biomass (corn stalks and miscanthus). Microwave pretreatment using various solvents was first compared to conventional heating on corn stalks. Then, microwave operational conditions were extended in terms of incident power and treatment duration. Optimal conditions were chosen to increase p-hydroxycinnamic acids release. Finally, these optimal conditions determined on corn stalks were tested on miscanthus stalks to underlie the substrate incidence on p-hydroxycinnamic acids release yields. The optimal conditions—a treatment duration of 405 s under 1000 W—allowed extracting 1.38% FA and 1.97% CA in corn stalks and 0.58% FA and 3.89% CA in miscanthus stalks. The different bioaccessibility of these two molecules can explain the higher or lower yields between corn and miscanthus stalks.