Falco Guillaume, Guigo Nathanael, Vincent Luc, Sbirrazzuoli Nicolas
Université Côte d'Azur, Université Nice-Sophia Antipolis, Institution, Institut de Chimie de Nice, UMR CNRS 7272, 06108, Nice Cedex 02, France.
ChemSusChem. 2018 Jun 11;11(11):1805-1812. doi: 10.1002/cssc.201800620. Epub 2018 May 24.
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 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.
这项工作展示了如何通过聚合条件控制呋喃开环反应，以调节生物基聚糠醇（PFA）中的交联密度。通过碳核磁共振（C NMR）和傅里叶变换红外光谱（FT-IR）研究了水和异丙醇（IPA）对糠醇聚合的影响，特别是对呋喃开环的影响。结果表明，在溶剂存在下有利于形成开放结构，因此与无溶剂交联的PFA相比，热机械性能发生了改变。动态力学分析表明，当PFA中存在稍多的开放结构时，交联密度会显著降低。尽管用溶剂聚合的PFA玻璃化转变温度较低且弹性模量较低，但即使PFA中有更多开放结构，其热稳定性仍然非常高（>350°C）。
