Influences of curing agent and water absorption on microstructure epozy resins studied by PALS
(0) The influences of curing agent 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 3 I suggested that the free volume concentration was not affected by the water sorption. On the other hand, the effect of curing agent on the positron annihilation parameters was also examined. Experimental results indicated that both chemical reaction between the positronium and chlorines and electronegative chlorines attracting positrons can reduce the positronium formation.
J.J.Wang B.Wang W.Zhou J.Gong Z.L.Gong S.J.Yue
Department of Physics,Wuhan University,Wuhan 430072,P.R.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
76
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）