【摘要】 在传统膨胀阻燃体系中，作为酸源的聚磷酸铵（APP）与环氧树脂（EP）的界面相容性差是普遍问题，导致通常需要较高的添加量才能达到良好的阻燃效果。为了解决这类问题，本文合成了一种以APP为核，壳聚糖（CS）为壳的核-壳结构材料APP@CS，以改善其与EP的相容性，同时合成了与EP基体相容性较好的氨基酚醛树脂（APS）作为膨胀阻燃体系的碳源。热分析结果显示，EP/8%APP@CS/APS的残炭量较EP提升了约173%。阻燃性能方面，EP/8%APP@CS/APS经过UL 94测试达到V-1级别，极限氧指数达到31.6%。与纯EP相比，EP/8%APP@CS/APS复合材料的峰值放热率、总放热率、总排烟量和烟释放速率分别降低78.0%、55.1%、54.5%和58.3%。APP@CS和APS在改善EP的热性能和阻燃性能方面具有协同作用。更多还原

【Abstract】 In the traditional intumescent flame retardant system, the poor interfacial compatibility between ammonium polyphosphate(APP), as the acid source, and epoxy resin(EP) is a common problem, resulting in the need for a higher additive amount to achieve a good flame retardant effect. In order to solve this kind of problem, this paper synthesized a core-shell structural material APP@CS with APP as the core and chitosan(CS) as the shell to improve its compatibility with EP, and at the same time synthesized an aminophenol-formaldehyde resin(APS), which has better compatibility with EP matrix, as the carbon source of intumescent flame-retardant system. Thermal analysis results show that EP/8%APP@CS/APS has a significant increase in residual carbon of about 173% compared to EP. In terms of flame retardancy, EP/8%APP@CS/APS passed UL 94 V-1 rating with an ultimate oxygen index of 31.6%. The peak heat release rate, total heat release rate, total smoke emission, and smoke release rate of the EP/8% APP@CS/APS composite were reduced by 78.0%, 55.1%, 54.5%, and 58.3%, respectively, compared to pure EP. The above results show that APP@CS and APS have synergistic effects in improving the thermal and flame retardant properties of EP.更多还原