Behaviors in Strain-induced Crystallization of Natural Rubber : For the Selection of Clone of Hevea Tree

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The final objective of this study is to maximize functions and performances of natural rubber (NR) which is a very important biomass for industrial uses such as pneumatic tires.For this purpose, strain-induced crystallization of NR samples from different clones are studied using a dynamic condition at a synchrotron radiation beam line i.e. simultaneous measurements of wide-angle X-ray diffraction and tensile-mode deformation. The results are to be of use for the selection of better NR : Strain-induced crystallization has been assumed to be the most important factor to determine superior mechanical properties of NR. Effects of micron-size dirt, non-rubber components such as aliphatic acid and proteins contained in NR, and nano-fillers such as carbon black on the behavior in strain-induced crystallization of NR were elucidated.A few different clones of Hevea have been obtained from Sri Lank and Thailand. Using these samples, the main experiments to elucidate the effect of Hevea clones on the crystallization are now in progress and will be reported in a near future.