MISC

2000年2月

Formation of junction zones in thermoreversible gelation process of ethylene-propylene random copolymer/toluene systems

SEN-I GAKKAISHI
  • M Okada
  • ,
  • Y Tsuchiya
  • ,
  • M Okabe
  • ,
  • M Takahashi
  • ,
  • H Matsuda

56
2
開始ページ
104
終了ページ
108
記述言語
英語
掲載種別
DOI
10.2115/fiber.56.104
出版者・発行元
SOC FIBER SCIENCE TECHNOLOGY

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-m(g) measured by FBM, values of number of monomers xi per chain in a junction point were evaluated. Further, values of zeta and s were evaluated by the Tanaka theory. zeta in Tanaka theory has the same physical meaning as xi in Takahashi theory and s means the number of polymer chains contained in a junction point. The obtained values of zeta have the same order of magnitude but smaller than xi.
In DSC mesurements, the enthalpy of melting (Delta H-m) of junction points was measured. Delta H-m increases with the increase of gelation time, and then approaches a constant value. The gelation time t(n), which is necessary to reach the equilibrium value of Delta H-m, is extremely longer than the gelation rime t(m), which is necessary to obtain a constant value of T-m(g).

リンク情報
DOI
https://doi.org/10.2115/fiber.56.104
CiNii Articles
http://ci.nii.ac.jp/naid/10005371223
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000086228600013&DestApp=WOS_CPL
ID情報
  • DOI : 10.2115/fiber.56.104
  • ISSN : 0037-9875
  • CiNii Articles ID : 10005371223
  • Web of Science ID : WOS:000086228600013

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