Aspects of the melting of highly oriented polypropylene

The influence of the stretching ratio on the point and heat of melting in free and isometric states and also on the shrinkage stress of isotactic polypropylene has been investigated. With rise in the stretching ratio the melting peak splits into several peaks. The melting point of the high temperatu...

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Bibliographic Details
Published in:Polymer science USSR 1987, Vol.29 (3), p.565-570
Main Authors: Yerina, M.A., Knunyants, M.I., Baranov, A.O., Prut, E.V., Yenikolopyan, N.S.
Format: Article
Language:English
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Summary:The influence of the stretching ratio on the point and heat of melting in free and isometric states and also on the shrinkage stress of isotactic polypropylene has been investigated. With rise in the stretching ratio the melting peak splits into several peaks. The melting point of the high temperature peak in the isometric state is higher than in the free but in the case of the low temperature peak they are identical. The heat of melting does not depend on the conditions of melting and grows with increase in the stretching ratio as does the shrinkage stress.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(87)90263-2