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通过溶液混合的方法制备了环氧树脂/聚醚酰亚胺(PEI)/多壁碳纳米管(MWCNTs)三元复合物,并使用扫描电镜(SEM)、原位红外分析(FTIR)、流变测试和非等温DSC等手段研究了MWCNTs的存在对体系相分离形貌和固化反应的影响.扫描电镜的结果显示,在固化后的样品中MWCNTs较均匀地分散在两相中.150℃下固化,不含MWCNTs和MWCNTs含量为0.75 pbw的体系相分离形貌呈海岛状结构,而进一步增大MWCNTs含量后相分离形貌呈双连续结构,且相区尺寸随MWCNTs含量的增加而减小.120℃下固化,不含MWCNTs和MWCNTs含量为0.75 pbw的体系相分离形貌呈双连续结构,而进一步增大MWCNTs含量后,体系相分离形貌呈相反转结构.FTIR和DSC的测试结果表明,MWCNTs表面的羟基对环氧树脂的固化反应起到催化作用,使得固化反应速度加快,反应活化能降低.而流变测试的结果表明,随着MWCNTs含量增加,一方面交叉跨越多个相区的碳纳米管使得体系黏度增大,对相分离起到了一定的抑制作用;另一方面使得体系凝胶化时间提前,导致体系相分离形貌被固定在相分离的较早阶段,起到有效调控相分离形貌的作用.
Epoxy resin / polyetherimide (PEI) / multiwalled carbon nanotubes (MWCNTs) ternary composites were prepared by solution mixing, and the morphology of the composites was characterized by scanning electron microscopy (SEM), in situ infrared spectroscopy (FTIR) The effects of MWCNTs on the phase separation morphology and the curing reaction were investigated by means of DSC, differential scanning and non-isothermal DSC.The results of scanning electron microscopy showed that the MWCNTs were more evenly dispersed in the two phases in the cured samples. The phase separation morphology of solidified MWCNTs with MWCNTs of 0.75 pbw was island-like structure, and the phase separation morphology was bicontinuous after MWCNTs was further increased, and the size of phase region decreased with the increase of MWCNTs .The phase separation morphology of the system without MWCNTs and MWCNTs of 0.75 pbw solidified at 120 ℃, while the phase separation morphology of the system exhibited phase inversion after the MWCNTs content was further increased.FTIR and DSC test results The results showed that the hydroxyl groups on the surface of MWCNTs played a catalytic role in the curing reaction of epoxy resin, which accelerated the curing reaction and reduced the activation energy.The results of rheological tests showed that as MWCNTs content increased, Area of the carbon Nanotubes make the system viscosity increases, the phase separation played a certain inhibitory effect; the other hand, the system makes the gel time ahead of time, leading to phase separation morphology is fixed in the early stages of phase separation, play an effective regulatory phase The role of separation morphology.