Molecular aggregation structure evolution during stretching of environmentally benign lysine-based segmented poly(urethane-urea)s

Yuji Higaki, Ken Suzuki, Yoshihiko Oniki, Kevin L. White, Noboru Ohta, Atsushi Takahara

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The molecular aggregation structure evolution during uniaxial stretching deformation and the uniaxial tensile mechanical properties for an environmentally benign and biodegradable segmented poly(urethane-urea) (SPUU) elastomer based on an α-amino acid lysine-based diisocyanate (LDI) was investigated. The performance was compared with a conventional SPUU elastomer consisting of a symmetric aliphatic short chain diisocyanate (1,4-butane diisocyanate). Both SPUUs contain a 1,4-butanediamine chain extender and poly(ε-caprolactone) soft segments. The evolution of molecular aggregation structure during stretching was monitored using in-situ simultaneous small-angle X-ray scattering and wide-angle X-ray diffraction. The LDI-based SPUU film contains weakly aggregated, disordered hard segment domains that readily dissociate upon mechanical deformation. The permanent deformation through fragmentation of the hard segment domains and strain-induced crystallization are associated with the low strength and large hysteresis loss of the LDI-based SPUU.

Original languageEnglish
Pages (from-to)173-179
Number of pages7
Journalpolymer
Volume78
DOIs
Publication statusPublished - Nov 5 2015

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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