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Renewable benzoxazine monomers from “lignin-like” naturally occurring phenolic derivatives

2013; Wiley; Volume: 51; Issue: 22 Linguagem: Inglês

10.1002/pola.26918

1099-0518

Marc Comí, Gerard Lligadas, Juan C. Ronda, Marina Galià, Virgínia Cádiz,

Injection Molding Process and Properties

The benzoxazines of three naturally occurring phenylpropanoid phenols: ferulic, coumaric, and phloretic acids, and their esters are described. Benzoxazines with conjugated unsaturated chains exhibit unusual poor thermal stability and degrade partially at the polymerization temperature making necessary the use of a catalyst (BF3.Et2O) to low the polymerization temperature and prevent degradation. Polybenzoxazines are prepared thermally and characterized by DSC and TGA techniques. The resulting materials have superior Tgs when compared with those prepared from an unsubstituted monofuctional benzoxazine due to the additional crosslinking through the ester and carboxylic moieties. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4894–4903