Effect of micro-aggregation structure on rheological properties of thermoplastic polyurethanes

Satoshi Yamasaki, Daisuke Nishiguchi, Ken Kojio, Mutsuhisa Fmukawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effect of micro-aggregation structure on the rheological properties of thermoplastic Polyurethane (TPU) was investigated. The TPU samples prepared by injection molding were annealed at various temperatures from 23 to 120°C for 4 h. Differential scanning calorimetry (DSC) and pulsed NMR measurements revealed that the degree of micro-phase separation of the TPUs became stronger with increasing annealing temperature due to the progress of formation of well-organized hard segment domains. The temperature sweep experiments for molten TPUs indicated that the temperature of critical gel point at intersection between G' and G", increased with increasing annealing temperature. In addition, the TPUs showed the strain hardening of uniaxial elongation viscosity with increasing annealing temperature owing to residual hard segment domains at an operating temperature. It was revealed that the formation of well-organized hard segment domains had a profound effect on the rheological properties of TPUs, in particular on their elongational viscosity.

Original languageEnglish
Title of host publication55th SPSJ Symposium on Macromolecules
Pages3369-3370
Number of pages2
Volume55
Edition2
Publication statusPublished - 2006
Externally publishedYes
Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
Duration: Sep 20 2006Sep 22 2006

Other

Other55th Society of Polymer Science Japan Symposium on Macromolecules
CountryJapan
CityToyama
Period9/20/069/22/06

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Yamasaki, S., Nishiguchi, D., Kojio, K., & Fmukawa, M. (2006). Effect of micro-aggregation structure on rheological properties of thermoplastic polyurethanes. In 55th SPSJ Symposium on Macromolecules (2 ed., Vol. 55, pp. 3369-3370)