... 强酸 strong acid 羟甲基 methylol groups 羟甲基苯酚 methylol phenol ...
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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。
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