It was shown that the curing process of resoles, at first, proceeded by condensation reaction of methylol groups, and the formation of dimethylene ether linkage was predominant.
结果表明热固性酚醛树脂的固化过程，首先是羟甲基发生缩合反应，缩合反应形成醚键是主要的。
2
The results indicated that the thermal stability of phenol-formaldehyde resin was related to the presence of dimethylene ether linkage. The thermal stability decreased as the ether linkage increased.