Precursor of shish–kebab in isotactic polystyrene under shear flow

• 金谷, 利治

• Matsuba, Go

• Zhao, Yunfeng

• Nishida, Koji

• Kanaya, Toshiji

抄録

We performed polarized optical microscope (POM), depolarized light scattering (DPLS) and small- and wide-angle X-ray scattering measurements on the structure formation process or the crystallization process of isotactic polystyrene (iPS) under shear flow below and above the nominal melting temperature Tm. It was found that an anisotropic oriented structure termed here as a string-like object was formed in μm scale even above the nominal melting temperature and stable for more than 24 h, but melted at around 270 °C far above the nominal melting temperature. The string-like object acts as a nucleation agent for the folded chain lamella crystal (or the kebab), and was assigned to a precursor of the shish–kebab. We also examined the shear rate dependence of the structure formation to find a critical shear rate for the formation of the string-like object, suggesting the relaxation of the chains plays an important role in the formation of the structure. Based on the results we have discussed the inner structure of the string-like object.

収録刊行物

• Polymer

  Polymer 50 (9), 2095-2103, 2009-04-24

  Elsevier

キーワード

• Precursor
• Shish–kebab
• Shear flow

詳細情報

• CRID: 1050282676916722560
• NII論文ID: 120002317430
• NII書誌ID: AA00776983
• ISSN: 00323861
• HANDLE: 2433/123398
• 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