以埃洛石纳米管和氧化石墨烯作为原料构建半无机-半有机杂化气凝胶,分别通过聚甲基丙烯酸甲酯(PMMA)和聚硅氧烷(PSO)作为聚合物连接有机、无机两相,研究杂化气凝胶的构建过程与应力传递行为。通过扫描电子显微镜、X射线光电子能谱等表征手段分析了杂化气凝胶微观形貌、表面化学状态等,进而研究气凝胶的构建过程,通过宏观力学性能、激光显微拉曼光谱等研究不同特性杂化气凝胶的应力传递行为。结果表明,PMMA和PSO作为聚合物连接的埃洛石-氧化石墨烯两相,均能形成气凝胶微观形貌,通过PMMA连接的杂化气凝胶应力传递面积较小,气凝胶强度高,韧性较差;而通过PSO连接的杂化气凝胶应力传递面积大,气凝胶同时具有较高的强度和韧性。
Halloysite nanotubes and graphene oxide(GO) were used as raw materials to build semiinorganic-semiorganic hybrid aerogels.The organic and inorganic phases were connected by polymethyl methacrylate (PMMA) and polysiloxane (PSO) as polymer bridges to study the process and stress transfer behavior of hybrid aerogels,respectively.Scanning electron microscopy,fourier transform infrared spectroscopy and X ray photoelectron spectroscopy were used to characterize the micromorphology and surface chemical state of the aerogels.The aerogel construction process was studied.The stress transfer behaviors of the aerogels with different properties were studied by macroscopic mechanical properties and raman spectroscopy.The results showed that PMMA and PSO formed typical aerogel morphology as polymer bridge connected halloysite.The stress transfer area of the aerogel through PMMA was small,the aerogel strength was high and toughness was poor.The aerogels connected by PSO had high stress transfer area,and aerogels had high strength and toughness at the same time.
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基金资助
天津市自然科学基金(18JCQNJC03000);中国博士后科学基金面上项目(2019M651052)
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