Strain-induced crystallization of peroxide-crosslinked natural rubber

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• 作者：Yuko Ikeda ; Yoritaka Yasuda ; Shinya Makino ; Shinya Yamamoto ; Masatoshi Tosaka ; Kazunobu Senoo ; Shinzo Kohjiya
• 关键词：Peroxide-crosslinked natural rubber ; Strain-induced crystallization ; Network-chain density
• 刊名：Polymer
• 出版年：2007
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：23 February 2007
• 卷：48
• 期：5
• 页码：1171-1175
• 文件大小：219 K

摘要

Effect of network-chain density (ν) on the strain-induced crystallization of peroxide-crosslinked natural rubber was studied by fast time-resolved synchrotron wide-angle X-ray diffraction. It was observed that the elongation ratio at the onset of strain-induced crystallization (α_c) became smaller with the increase of ν. The difference of the entropy between the undeformed and deformed states at each α_c was nearly equal in spite of the variation of ν. The calculated melting temperature at α_c of the samples was also almost the same regardless of their ν. These observations mean that the strain-induced crystallization occurred when the deformation brought about a definite entropic state for peroxide-crosslinked natural rubber. They agreed with the prediction by Flory and were consistent with the classical theory of rubber elasticity.