Influence of Microstructure on Micro-/Nano-Mechanical Measurements of Select Model Transparent Poly(urethane urea) Elastomers

Abstract

Morphology of 4,40 -dicyclohexylmethane diisocyanateepoly(tetramethylene oxide) (PTMO)ediethyl toluenediamine based poly(urethane urea) (PUU) elastomers is investigated by atomic force microscopy (AFM) and compared with elastic modulus data measured from AFM-enabled indentation, dynamic nanoindentation (nanoDMA), and dynamic mechanical analysis (DMA). These measurements highlight the effect of altering the molecular weight (Mw) of PTMO, which is used as a soft segment (SS), on the microstructure. In particular, at SS Mw 2000 g/mol, a strong microphase-separated morphology is observed, whereas a phase-mixed dominated microstructure is noted in PUU with SS Mw of 1000 and 650 g/mol. These observations are also consistent with DMA tan d results. Furthermore, instrumented impact indentation is also utilized for elucidation of dynamic damping characteristics in these PUUs.

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Document Details

Document Type
Technical Report
Publication Date
Dec 17, 2012
Accession Number
ADA607948

Entities

People

  • Alex J. Hsieh
  • Kenneth E Strawhecker
  • Krystyn Van Vliet
  • Tanya L. Chantawansri
  • Z. I. Kalcioglu

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Biomedical
  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Biomedical And Dental Materials
  • Chemical Kinetics
  • Chemistry
  • Department Of Defense
  • Diffraction
  • Dynamic Loads
  • Elastomers
  • Materials
  • Materials Laboratories
  • Materials Science
  • Mechanical Properties
  • Modulus Of Elasticity
  • Molecular Weight
  • Polymers
  • Scattering
  • Standards
  • X Rays

Fields of Study

  • Materials science

Readers

  • Nanocomposite Materials Science
  • Polymer Science and Engineering.
  • Polymer Science and Technology