Abstract
Young’s modulus for Polythene, cross-linked by pile irradiation, has been measured by both static and dynamic means. Below about 115°C (the usual melting-point) the modulus decreases with temperature. Above this temperature it increases again, in agreement with the theory of rubber-like elasticity, except for very high degrees of cross-linking, corresponding to a glass-like structure. The effect of radiation is both to produce cross-linking, and to destroy crystallinity. The latter effect predominates below about 4% cross-linking, and a more flexible material is obtained at room temperature. The observed elastic properties below 115°C are ascribed in part to the attraction of neighbouring chains; the activation energy required to break these attractive forces is estimated at about 0·25 eV.
Reference7 articles.
1. Alfrey T. Jr. 1948 Mechanical behaviour of high polymers. New York: Interscience.
2. Proc. Roy;Charlesby A.;Soc. A,1952
3. Investigation of halo patterns of amorphous polymers
4. Proc. Roy;Charlesby A.;Soc. A,1953
5. Glasstone S. Laidler K. J. & Eyring H. 1941 Theory of rate processes. New York: McGraw Hill.
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