Characterization of Crosslinked Poly (ether urethane)and Study of Its Transitions and Free-Volume Properties with Positron Annihilation

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (4): 603.

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Characterization of Crosslinked Poly (ether urethane)and Study of Its Transitions and Free-Volume Properties with Positron Annihilation

LIU Hao¹, GUO Jun-Shi¹, XIE Hong-Quan¹, WANG Bo², LI Shi-Qing², WANG Shao-Jie²

1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan, 430074;
2. Department of Physics, Wuhan University, Wuhan, 430072

Received:1993-07-01 Revised:1993-09-27 Online:1994-04-24 Published:1994-04-24

Abstract

Abstract: The structure of crosslinked poly(ether urethane)was characterized by ATR-IR,and its conductivity of the polymer complex with LiClO₄ is in close relationship with free-volume of the polymer, In the temperature range from 110─350K, lifetime spectra of positron annihilation in PEUhave been measured.The result shows that positron lifetime is sensitive to the transitions and free-volume holes in the polymer.From lifetime spectra we get the informations of secondary transition, glass transition and crystal melting transition.The temperature dependences of the size of free-volume in PEUare calculated from the o-Ps annihilation lifetime.

Key words: Positron annihilation, Poly(ether urethane), Glass transition, Secondary transition, Free-volume

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LIU Hao, GUO Jun-Shi, XIE Hong-Quan, WANG Bo, LI Shi-Qing, WANG Shao-Jie. Characterization of Crosslinked Poly (ether urethane)and Study of Its Transitions and Free-Volume Properties with Positron Annihilation[J]. Chem. J. Chinese Universities, 1994, 15(4): 603.

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Characterization of Crosslinked Poly (ether urethane)and Study of Its Transitions and Free-Volume Properties with Positron Annihilation

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