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The Influence of Crystalline Texture on the Tensile Properties of Natural Rubber. I

P. E. Reed
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 338, No. 1615 (Jul. 16, 1974), pp. 459-478
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/78593
Page Count: 20
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The Influence of Crystalline Texture on the Tensile Properties of Natural Rubber. I
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Abstract

The crystalline morphologies that are attainable in samples of natural rubber (n.r.), by extending the samples prior to crystallization, are reviewed. Specimens covering the full range of crystalline morphologies possible have been prepared and tensile tested between -120 and -26 degrees C. The tensile behaviour of crystalline samples is compared and contrasted with that of oriented, but non-crystalline, identical natural rubber in the same temperature range. It is found that the tensile behaviour of semi-crystalline n.r. is dominated by the amorphous phase throughout the temperature range -120 to -26 degrees C. At temperatures above the glass transition temperature (Tg) of the amorphous phase, the crystalline phase acts mainly as a diluent of the amorphous phase. At temperatures below Tg, where the crystalline phase is set in a glassy matrix, it is found that the crystalline morphology does significantly affect the tensile behaviour. Attempts are made to differentiate the effects of crystallinity, crystalline morphology and orientation of the amorphous phase on the tensile properties of natural rubber.

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