Effect of Ozygen on the Free Volume Property of Poly (ether-urethane) Irradiated by Neutron
Polyurethane is widely used in medical, automotive and industrial fields, and it has been paid more attention and studied extensively. 1 Neutron irradiation damage is a useful tool to change the microstrucuture without introducing other chemical groups in polymer. 2 The free volume property and intermolecular interaction (especially hydrogen bonding) of poly (ether-urethane) (PEU) irradiated by neutron under different atmosphere has been studied by positron annihilation lifetime spectra (PALS) and Fourier transform infrared (FTIR). The results suggested that the hydrogen-bonding interactions and free volume property in PEU depended strongly on the neutron irradiation dose. With increasing the irradiation dose, the hydrogen bonds increased, and fractional free volume decreased. It is found that the stronger the hydrogen-bonding interaction, the higher the average chain packing efficiency and the smaller the fractional free volume, the better the miscibility. On the other hand, the presence of oxygen in the irradiation process enhanced the hydrogen bonding interaction, which resulted in more free volume collapsed. With neutron flux increase, two subpeaks in free volume distribution merged together, and the presence of oxygen accelerated the transformation.
Z.Chen W.Huang W.Yu P.F.Fang S.J.Wanga J.Xiong Y.S.Xu
Physics Department,Wuhan University,Wuhan 430072,PR China Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,PR C
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
21
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）