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通过己二酸(AA)和二乙烯三胺(DETA)改性制得了一种氨基功能化氢氧化镁(DETA-AA-MH),并将其用作环氧树脂固化剂。采用FTIR、XRD、固体核磁、纳米粒径分析仪、SEM和TGA对DETA-AA-MH的化学结构、形貌以及热稳定性进行了表征,并通过FTIR和DSC分析得到环氧树脂(DGEBA)和DETA-AA-MH发生固化反应的最佳质量分数分别为84.03%和15.97%,热固化实验分析得到最佳反应条件为:预固化温度及时间(80℃/0.5 h)和后固化温度及时间(110℃/3 h)。LOI测试分析结果表明,DGEBA/DETA-AA-MH较DGEBA/DETA的LOI提高了10.15%。采用SEM和EDS对环氧树脂燃烧后的炭残留物进行分析,结果表明,在燃烧过程中DETA-AA-MH促进保护碳层的形成。机械性能测试表明,DGEBA/DETA-AA-MH(固化剂质量分数15.97%)与DGEBA/DETA(固化剂质量分数7.38%)对比发现其弯曲强度、弯曲模量和冲击强度分别提高了663.64%、49.92%、235.77%。
An amino-functionalized magnesium hydroxide (DETA-AA-MH) was prepared by modification with adipic acid (AA) and diethylenetriamine (DETA) and was used as an epoxy resin curing agent. The chemical structure, morphology and thermal stability of DETA-AA-MH were characterized by FTIR, XRD, NMR, TGA, SEM and TGA. The epoxy resin (DGEBA) And DETA-AA-MH were 84.03% and 15.97% respectively. The optimal reaction conditions for the thermal curing experiment were: pre-curing temperature and time (80 ℃ / 0.5 h) and post-curing temperature Time (110 ° C / 3 h). LOI test analysis showed that DGEBA / DETA-AA-MH increased the LOI of DGEBA / DETA by 10.15%. SEM and EDS were used to analyze the carbon residue after the combustion of epoxy resin. The results showed that DETA-AA-MH promoted the formation of protective carbon layer during the combustion process. The mechanical properties tests showed that the flexural strength, flexural modulus and impact strength of DGEBA / DETA-AA-MH (15.97% curing agent) and DGEBA / DETA (curing agent weight fraction 7.38%) were 663.64% 49.92%, 235.77%.