In-Situ Studies of Structure Development during Deformation of a Segmented Poly(urethane−urea) Elastomer

The structural development of a segmented poly(urethane−urea) (PUU) elastomer containing a low concentration of hard segment during deformation was studied by simultaneous mechanical and optical measurements (rheooptical techniques). Specifically, in-situ wide-angle X-ray diffraction and small-angle...

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Bibliographic Details
Published in:Macromolecules 2003-03, Vol.36 (6), p.1940-1954
Main Authors: Yeh, Fengji, Hsiao, Benjamin S, Sauer, Bryan B, Michel, Samuel, Siesler, Heinz W
Format: Article
Language:English
Subjects:
Applied sciences
DEFORMATION
ELASTOMERS
Exact sciences and technology
MATERIALS SCIENCE
Mechanical properties
MORPHOLOGY
NATIONAL SYNCHROTRON LIGHT SOURCE
Organic polymers
Physicochemistry of polymers
POLYURETHANES
Properties and characterization
UREA
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Summary:The structural development of a segmented poly(urethane−urea) (PUU) elastomer containing a low concentration of hard segment during deformation was studied by simultaneous mechanical and optical measurements (rheooptical techniques). Specifically, in-situ wide-angle X-ray diffraction and small-angle X-ray scattering using synchrotron radiation and time-resolved Fourier transform infrared spectroscopy were applied to investigate the segmental orientation of PUU chains during cyclic elongation and recovery. Formation of two different domain microstructures is characterized with changes in strain. These microstructures consist of lamellar hard domains and highly stressed nanofibrils consisting of alternating hard and crystalline soft domains. By comparing the X-ray scattering and vibrational spectroscopic data, a morphological model of hard- and soft-segment microphase separation, orientation, and strain-induced crystallization in the soft segments was obtained.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma0214456