(1. 清華大學(xué) 機(jī)械工程系，北京 100084；2. 清華大學(xué) 先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室，北京 100084)
摘 要: 通過對(duì)CNTs/EP(CNTs為碳納米管，EP為E54環(huán)氧樹脂)二元體系進(jìn)行差熱(DSC)及恒溫流變性能的分析，以及對(duì)以表面原位生長CNTs的碳纖維織物(CFF)為增強(qiáng)相、環(huán)氧樹脂為基體復(fù)合材料(CNTs/CFF/EP)的密度、力學(xué)性能的分析，獲得采用熱壓法制備含碳納米管的CNTs/CFF/EP三元層狀復(fù)合材料的合理工藝參數(shù)，并研究加壓時(shí)間對(duì)復(fù)合材料性能的影響。結(jié)果表明：當(dāng)預(yù)熱溫度為150 ℃、預(yù)熱保溫約60 min后加滿壓、熱固化溫度為195 ℃的條件下可制得表面無缺陷、致密度為97.3%~98%的CNTs/CFF/EP三元復(fù)合材料；原位生長CNTs的引入，可使復(fù)合材料的層間剪切強(qiáng)度提高52%、抗彎強(qiáng)度提高26%；加壓時(shí)機(jī)的提前及延遲均會(huì)不同程度地降低復(fù)合材料的力學(xué)性能。
關(guān)鍵字: 層狀復(fù)合材料；E54環(huán)氧樹脂；原位生長碳納米管；碳纖維織物；熱分析
（1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;2. Key Laboratory for Advanced Materials processing Technology, Ministry of Education, Beijing 100084, China）
Abstract:The appropriate technological parameters for the preparation of in-situ growing CNTs/CFF/EP (CNTs is carbon nanotubes, EP is E54 epoxy resin) ternary laminar composites by the hot-pressed method were obtained by the analysis of DSC characteristic curves and isothermal rheological curves of CNTs/EP binary system, together with the analysis of density and mechanical properties of CNTs/CFF/EP composite with EP matrix laminar composites reinforced by carbon fiber fabric (CFFs) with in-situ growing CNTs. The effect of the pressure time on the properties of the composites was studied. The results show that when the CNTs/CFF/EP ternary laminar composite precursors are preheated at 150 ℃ for about 60 min, which is pressure time, and then heated at 195 ℃ with full load on, the composite can be well molded with smooth surface with no defects and high density (97.3%-98%); the introduction of in-situ growing CNTs can increase the interlaminar shear strength of the composites by 52%, as well as the bending strength by 26%; ahead or delay of pressure time can bring negative effects on properties of the composites to different extent.
Key words: laminar composite; E54 epoxy; in situ growing carbon nanotubes; carbon fiber fabric; thermal analysis
