Abstract
IT has been shown, both theoretically1 and experimentally2,3, that in simple elongation of a sample of a pure gum vulcanizate, an approximately linear relationship between the tensile stress t and the birefringence (n1 − n2) obtains, provided the strain is not sufficiently large to produce crystallization. We may write where C, the constant of proportionality, is termed the ‘stress-optical coefficient’, and is theoretically independent of the degree of cross-linking (vulcanization) of the vulcanizate and should be identical for all pure rubbers.
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References
Kuhn and Grün, Koll. Zschr., 101, 248 (1942).
Treloar, Trans. Farad. Soc., 43, 284 (1947).
Thibodeau and McPherson, Bur. Stand. J. Res., 13, 887 (1934); Rub. Chem. and Tech., 8, 183 (1935).
Farmer and Moore, unpublished work; but see Gee, Trans. Inst. Rub. Indust., 25, 88 (1949).
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SAUNDERS, D. Birefringence in Rubbers. Nature 165, 360 (1950). https://doi.org/10.1038/165360a0
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DOI: https://doi.org/10.1038/165360a0
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