“…Interestingly, furfuryl alcohol, which is mainly extracted from corncob, has a stable furan ring and reactive hydroxymethyl group. It is often used to prepare bio-based materials with high hardness and good thermal performance, such as thermosetting rigid plastic [ 29 ], foams [ 30 , 31 , 32 , 33 ], wood adhesives [ 34 , 35 , 36 ], and grinding wheels [ 37 , 38 , 39 ]. Although the polycondensation of starch and furfuryl alcohol is considered to yield foams with good thermal stability and hardness, the hydroxymethyl group in furfuryl alcohol can react with the adjacent furfuryl alcohol under acidic conditions [ 29 ], so it is easy for it to undergo self-polycondensation under acidic conditions, while it is difficult for it to undergo further crosslinking with starch.…”