环氧树脂(EP)常见的表征方法
2023-11-28 09:51:03 0 2156
EP概述
EP具有附着力强、可塑性高、耐腐蚀性、电绝缘性能好、机械强度高、化学稳定性好、尺寸稳定性优异、介电性能突出、易于加工且成本低等诸多优异性能。因此,环氧树脂作为涂料、胶黏剂和复合材料的树脂基体,被广泛用于航空航天、交通运输、电子电气和5G通讯等众多领域。EP材料该如何表征呢?今天给大家介绍几种对EP来说常见的表征方法。
EP常见的表征方法
图1. FEP, TEREP和CEP的红外光谱图
图3. 复合材料的XRD图
图4. EP/DDM和EP/DDM/10ESD的XPS光谱
图5. DGEBA/MNA和BPBO/MNA的DSC曲线
图7. 改性树脂的DMA曲线
图8. EP复合材料的弯曲强度,弯曲模量,弯曲应力-应变曲线和冲击强度
10、锥形量热测试(CCT):
通过锥形量热测试(CCT)模拟了纯EP和复合材料在实际火灾中的燃烧风险。如图10a,b所示,纯EP的峰放热率(PHRR)为989.01kW/m2,总放热率(THR)为87.07MJ/m2,表明其具有高的热风险。随着无机纳米阻燃剂的引入,EP复合材料的PHRR和THR值逐渐降低,证明了纳米材料对复合材料防火安全有积极作用。BN/PATP@Cu-MOF/EP的PHRR和THR值最低,反映了其最佳的阻燃效果。此外,聚合物燃烧过程中释放的有毒烟雾也对人们的生命构成严重威胁。如图10c,d所示,纯EP的峰烟雾释放率(PSPR)和总烟雾产生率(TSP)分别为0.403m2/s和32.66m2,表现出极高的烟雾释放特性。随着无机纳米阻燃剂的引入,PSPR和TSP降低,说明添加无机纳米阻燃剂有利于减少EP复合材料燃烧过程中的烟雾排放。BN/PATP@Cu-MOF/EP的PSPR和TSP值最低,证明了其最佳的烟雾抑制效果。此外,CO和CO2作为典型的有毒气体,其释放量是评价火灾毒性的关键指标。如图10e,f所示,纯EP和不同EP复合材料的PCOPR和PCO2PR的趋势与烟雾释放率的变化相似。BN/PATP@Cu-MOF/EP实现了最低PCOPR和PCO2PR值。这些结果表明BN/PATP@Cu-MOF/EP具有较低的火灾毒性,主要与BN的强阻断作用、ATP的溶胀炭化作用以及Cu-MOF的促进炭化作用有关。
参考文献
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