This work shows how furan ring‐opening reactions were controlled by polymerization conditions to tune the cross‐link density in bio‐based poly(furfuryl alcohol) (PFA). The influence of water and isopropyl alcohol (IPA) on the polymerization of furfuryl alcohol, and particularly on furan ring‐opening, was investigated by means of 13 C NMR and FT–IR spectroscopy. Results indicated that formation of open structures were favored in the presence of solvents, thus leading to modification of the thermo‐mechanical properties compared to PFA cross‐linked without solvent. Dynamic mechanical analyses showed that when slightly more open structures were present in PFA it resulted in an important decrease of the cross‐link density. Despite lower glass‐transition temperature and lower elastic modulus for PFA polymerized with solvent, the thermal stability remains very high ( > 350 °C) even with more open structures in PFA.
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Falco et al. (2018) studied this question.
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