Study of the structure and molecular mobility of crystalline polyethylene by the methods of photo-elasticity and torsion pendulum

The authors have studied the temperature dependence of birefringence and the phase difference between stress and birefringence of PE films in a sinusoidal mechanical field. PE films with different degrees of crosslinkage and different degrees of extension were studied. It was found that the phase di...

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Bibliographic Details
Published in:Polymer science USSR 1982, Vol.24 (7), p.1551-1556
Main Authors: Grishchenko, A.Ye, Afonin, S.N., Artem'ev, V.A., Myasnikov, G.D., Koval'skii, A.F., Skazka, V.S.
Format: Article
Language:English
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Summary:The authors have studied the temperature dependence of birefringence and the phase difference between stress and birefringence of PE films in a sinusoidal mechanical field. PE films with different degrees of crosslinkage and different degrees of extension were studied. It was found that the phase difference ϕ between stress σ and birefringence δn changes sign from positive to negative in the temperature region 40–70°C. The results are interpreted in terms of the biphasic PE model containing an amorphous phase with positive optical anisotropy and the crystalline phase with negative anisotropy.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(82)90435-X