高性能环氧树脂／碳纳米管复合物的热分析研究  

THERMOANALYTICAL STUDIES OF HIGH PERFORMANCE EPOXY/CARBON NANOTUBE COMPOSITES

作　　者：谢鸿峰[1] 刘承果[1] 袁钻如[2] 杨琥[1] 王治流[1] 程镕时[1] 

机构地区：[1]南京大学化学化工学院教育部介观化学重点实验室高分子科学与工程系 [2]南京大学现代分析中心,南京210093

出　　处：《高分子学报》2008年第4期332-336,共5页Acta Polymerica Sinica

基　　金：南京大学人才培养基金(基金号0205005142)资助项目

摘　　要：用差示扫描量热仪(DSC)、热失重分析仪(TGA)和动态力学热分析仪(DMTA)研究了多壁碳纳米管(MWNTs)/高性能4,4′-二氨基二苯甲烷四缩水甘油环氧树脂(TGDDM)/4,4′-二氨基二苯基砜(DDS)复合物的热性能.Kissinger和Flynn-Wall-Ozawa的非等温固化动力学研究发现,随着MWNTs含量的增加,复合物固化反应的活化能先减小后增大.TGA研究表明,MWNTs的添加对环氧树脂热稳定性影响很小.碳纳米管填充到TGDDM/DDS体系后,复合物的储存模量随着MWNTs含量的增加而增大,而玻璃化温度却随之减小.Carbon nanotubes （CNTs） have outstanding characteristics including high mechanical properties, namelytensile strength and elastic modulus, and still remarkable flexibility, excellent thermal and electric conductivities, low percolation thresholds （loading weight at which a sharp drop in resistivity occurs） and high aspect ratios （length to diameter ratio, L/D）, while the latter provides the nanotubes with additional advantage over spherical fillers to obtain high property composites. Therefore, CNTs have the potential to act as a reinforcing filler of polymer matrices. Thetetraglycidyl-4,4＇- diaminodiphenylmethane （ TGDDM ） cured with 4,4＇- diaminodiphenylsulphone （DDS） and filled with graphite or carbon fibers are commonly used as a polymeric matrix in high performance composites employed in the aircraft and spacecraft industries. In present paper, multi-walled carbon nanotubes （MWNTs） as a nano-filler were incorporated in the TGDDM/DDS epoxy. The thermal properties of the composites were studied by differential scanning calorimetry （ DSC ）, dynamic thermal analysis （ DMTA ） and thermalgravitimetric analysis （ TGA ）. Inaddition,the dispersion of MWNTs in the epoxy was also investigated by scanning electron microscopy （SEM）. In DSC studies, Kissinger and Flynn-Wall-Ozawa （FWO） methods were used to study the nonisothermal cure kinetics of the MWNTs filled TGDDM/DDS composites at different heating rates. The activation energy （Ea） of cure reactions of the MWNTs filled epoxy composites was obtained by Kissinger and FWO methods. For all composites, the Ea obtained by Kissinger method was slightly less than that of FWO method. With the addition of MWNTs, the Ea of theepoxy composites decreased first and then increased with the increase of the MWNTs contents. These results showed that the incorporation of carbon nanotubes accelerated the cure reaction of the TGDDM/DDS epoxy at lower MWNTs content due to the interaction between the hydroxyl groups on the surface of nan

关 键 词：碳纳米管 复合物 热分析 固化反应动力学 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]