Investigation of free volume in epozy resins studied by PALS
The influences of curing agents and the water absorption on the microstructure have been studied by positron annihilation lifetime spectroscopy (PALS) and gravimetric measurement for epoxy resins DER331 (E51). We found that the o-Ps lifetime 3 τ dramatically decreases with the immersion time from 0h to 6h, and then reaches a saturate level in higher water absorption, while the o-Ps intensity almost remains a constant for all samples. This fact indicated that the water was first filled into free volume holes at low water content. The observation of the constant of I3 suggested that the free volume concentration was not affected by the water sorption. Experimental results indicated that both chemical reaction between the positronium and chlorines and electronegative chlorines attracting positrons can reduce the positronium formation.
epozy resin curing agents water absorption PALS free volume
Junjun Wang Bo Wang Wei Zhou Jing Gong Zhenli Gong Shaojie Yue
Department of Physics,Wuhan University,Wuhan 430072,China
国际会议
第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)
武汉
英文
82-84
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）