Dominating factor of strain-induced crystallization in natural rubber

• Gros, Alice

• 登阪, 雅聡

• Huneau, Bertrand

• Verron, Erwan

• Poompradub, Sirilux

• Senoo, Kazunobu

抄録

The contribution of entropy change due to stretching of polymer chains in promoting crystal nucleation is theoretically derived for strain-induced crystallization of natural rubber. The results of theoretical calculation are compared with experimental results obtained by fast time-resolved wide-angle X-ray diffraction. Usual values of surface free energies corresponding to chain-folded nuclei lead to theoretical results far from experimental measurements. Because the discrepancy comes from the large activation energy of nucleation even after the stretching of polymer chains, additional contribution of reduced surface free energies due to the formation of bundle-like nuclei was taken into account. This treatment allows to faithfully reproduce experimental results and then to conclude that nuclei formed in natural rubber during stretching are of bundle-like type. Moreover, it reveals that surface energies have a greater effect on the decrease of critical free energy than the change in entropy due to deformation.

収録刊行物

• Polymer

  Polymer 76 230-236, 2015-10

  Elsevier Ltd.

キーワード

• Nucleation
• Crystallization rate
• Shish-kebab structure

詳細情報

• CRID: 1050845760748946560
• NII論文ID: 120005678174
• ISSN: 00323861
• HANDLE: 2433/202579
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles