为了研究La2O3对不同酚类结构聚苯并(恶)嗪热稳定性的影响,将La2O3分别引入双酚A/苯胺型苯并(恶)嗪和对氯苯酚/苯胺型苯井(恶)嗪中间体中,制备了La2O3/苯并(恶)嗪固化物.通过红外光谱、热重分析、热重分析-红外光谱联用分别研究了La2O3对聚苯并(恶)嗪化学结构、热稳定性和热降解历程的影响.结果表明,La2O3并不影响2种聚苯并(恶)嗪的化学结构;La2O3与氮原子间的配位作用锚固了不稳定的“悬挂”苯胺结构,抑制了双酚A/苯胺型苯并(恶)嗪热降解过程中胺类降解产物的挥发,使得其固化物的5％热失重温度推迟了21℃,800℃残炭率提高了11％;氯原子的引入导致苯胺的对位在固化过程中参与了反应,使得对氯苯酚/苯胺型聚苯并(恶)嗪固化物中的苯胺结构主要存在于较稳定的化学交联结构中;La2O3与其氮原子中的配位作用几乎不影响胺类降解产物的挥发,La2O3仅仅使其固化物初始热分解温度有所提高,而几乎不影响其800℃残炭率.
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