Formation of Junction Zones in Thermoreversible Gelation Process of Ethylene-Propylene Random Copolymer/Toluene Systems.

• Okada Motoyuki

  Department of Fine Materials Engineering, Faculty of Textile Science and Technology

• Tsuchiya Yuko

  Department of Fine Materials Engineering, Faculty of Textile Science and Technology

• Okabe Masaru

  Department of Chemical Technology, Faculty of Engineering, Kanagawa Institute of Technology

• Takahashi Masato

  Department of Fine Materials Engineering, Faculty of Textile Science and Technology

• Matsuda Hideomi

  Department of Fine Materials Engineering, Faculty of Textile Science and Technology

抄録

Melting behaviour of ethylene-propylene random copolymer (EP random copolymer)/toluene thermoreversible gels was measured by the falling ball method (FBM) and differential scanning calorimetry (DSC). By applying the theory proposed by Takahashi, Nakamura and Kagawa (Takahashi theory) to the gel melting temperature T^g_m measured by FBM, values of number of monomers ξ per chain in a junction point were evaluated. Further, values of ζ and s were evaluated by the Tanaka theory. ζ in Tanaka theory has the same physical meaning as ξ in Takahashi theory and s means the number of polymer chains contained in a junction point. The obtained values of ζ have the same order of magnitude but smaller than ξ. In DSC measurements, the enthalpy of melting (ΔH_m) of junction points was measured. ΔH_m increases with the increase of gelation time, and then approaches a constant value. The gelation time t_h, which is necessary to reach the equilibrium value of ΔH_m, is extremely longer than the gelation time t_m, which is necessary to obtain a constant value of T^g_m.

収録刊行物

• 繊維学会誌

  繊維学会誌 56 (2), 104-108, 2000

  社団法人 繊維学会

キーワード

• General Medicine

詳細情報

• CRID: 1390001204830605952
• NII論文ID: 130004433214
• NII論文ID: 10005371223
• NII書誌ID: AN00131651
• DOI: 10.2115/fiber.56.104
• ISSN: 18842259
• ISSN: 00379875
• NDL書誌ID: 5277579
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5277579
• Web Site: http://www.jstage.jst.go.jp/article/fiber/56/2/56_2_104/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可