Temperature Dependence of Free Volume in Cross-linked Polyurethane Studied by Positrons

Chin. Phys. Lett.

2001, Vol. 18

Issue (1): 123-125 DOI:

Original Articles

Temperature Dependence of Free Volume in Cross-linked Polyurethane Studied by Positrons

HE Chun-Qing¹;DAI Yi-Qun¹;WANG Bo¹;WANG Shao-Jie¹;WANG Gui-You²;HU Chun-Pu²

¹Department of Physics, Wuhan University, Wuhan 430072 China ²Institute of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237

Cite this article:

HE Chun-Qing, DAI Yi-Qun, WANG Bo et al 2001 Chin. Phys. Lett. 18 123-125

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Abstract Positron annihilation lifetime spectroscopy has been used to study the free volume properties of the cross-linked polyurethane network as a function of temperature in the range from 15K to 300K. The glass transition of polyurethane was observed and the thermal expansion coefficient of the free volume was calculated. Analysis of the ortho-positronium (o-Ps) lifetime distribution shows that the distribution of the free volume in polyurethane is slightly broadened with the increasing temperature in the glassy state, and then significantly broadened with the increasing temperature above the glass transition.

Keywords: 78.70.Bj 64.70.Pf 65.70.+y

Published: 01 January 2001

PACS:	78.70.Bj	(Positron annihilation)
	64.70.Pf
	65.70.+y

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2001/V18/I1/0123

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