蒙脱土/环氧树脂纳米复合材料微结构的正电子湮没研究

蒙脱土/环氧树脂纳米复合材料微结构的正电子湮没研究 Investigation of Microstructure of Epoxy Resin/Montmorillonite Nanocomposite by Positron Annihilation 李相武 LI Xiang-wu~1 1 2 3 first-author 王波 WANG Bo~1 1 2 3 郑亚萍 ZHENG Ya-ping~2 1 2 3 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 School of Physics and Technology, Wuhan University School of Physics and Technology, Wuhan University 西北工业大学化学系,湖北,武汉,430072 西北工业大学化学系,湖北,武汉,430072 Department of Chemistry, Northwestern University of Industry Department of Chemistry, Northwestern University of Industry ,陕西,西安,710000 ,陕西,西安,710000 利用正电子湮没寿命谱（PALS）研究了环氧树脂蒙脱土纳米复合材料中正电子湮没参数、自由体积特性和力学性能随蒙脱土含量的变化.实验结果发现:当蒙脱土含量为 2%左右时,材料的自由体积的大小及强度明显下降,而正电子湮没的中间寿命分量的强度I2 达到最大.比较材料的力学性能和正电子湮没参数I2 随蒙脱土含量的变化,发现界面效应是决定弯曲强度性能的一个重要因素. Positron annihilation lifetime spectroscopy has been applied to study microstructure for epoxy-montmorillonite nanocomposite containing different content of montmorillonite, including the characteristics of free volume and interfacial layer, and the correlation between the positron annihilation parameters and the strength of the composite. It is observed that the o-Ps lifetime τ 3 and it’s intensity I 3 all decrease when the composite contains 2% montmorillonite, but the intensity of the second lifetime I 2 increases. A good correlation between I 2 and flexural strength is found, which indicated that the interfacial interaction plays an important role in determining the flexural strength. 正电子湮没 蒙脱土 环氧树脂 自由体积 界面 positron annihilation montmorillonite epoxy resin free volume interface TQ323.5 国家自然科学基金资助项目（50273028） 2005-01-01 2021-04-01 1