中文摘要：

按一定的升温制度将酚醛树脂初始样进行最高温度为200℃的固化处理，随后将样品分别在450、550、650、750℃进行裂解色谱、质谱解析。结果表明，裂解过程中，酚醛树脂结构中活性较高的亚甲基部分发生自身断链反应的同时，也有部分亚甲基与酚羟基进行交联反应。断链反应破坏了酚醛树脂骨架结构的稳定性，而交联反应则在一定程度上可以提高树脂结构的热稳定性。300～550℃内，两种反应竞争的结果决定酚醛树脂材料／制品的力学性能呈下降趋势。650-750℃时，酚羟基之间进行缩合反应，并进一步发生结构重排，促使酚醛树脂结构不断稠环化，逐渐转化生成无定形炭结构。

英文摘要：

Phenol-formaldehyde was cured at 200℃ with a selected velocity, and then decomposed at 450, 550, 650, 750℃ respectively. The results indicated that some methylene bonds were broken because of high activation, which deteriorated the phenol-formaldehyde structure. Some methylene groups were crosslinked with phenolic OH groups, which stabilized, at a certain extent, the phenol-formaldehyde structure in high temperature. The effect of the former on phenol-formaldehyde structure was dominate between 300 and 550℃, which was responsible for the deterioration of mechanic performance. Condense reaction between phenolic OH groups was occurred range of 650-750℃. In correspondly, structure recomposition was happened, which promoted structure-adjusting. As a result, the phenol-formaldehyde structure was transformed to amorphous carbon gradually.