TIT# Structure and Mechanical Properties of an Injection-Molded
     Thermoplastic Polyurethane as a Function of Melt Temperature
AUT# Stribeck, N.; Zeinolebadi, A.; Ganjaee Sari, M.; Frick, A.;
     Mikoszeg, M.; Botta, S.;
SOU# Macromol. Chem. Phys. (2011), in print
LOC# xv130
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ABS# TPUs molded at 205øC, 215øC and 235øC are monitored by SAXS and WAXS
     during straining. A non-affine nanostructure deformation and related
     evolution mechanisms are found. DSC and microscopy are applied. DSC
     shows 2 melting endotherms. Results indicate that melts kept below the
     2nd peak stay phase-separated. The orientation parameter $f(\eps)$ and
     $df / d\eps$ from WAXS is related to chain orientation mechanisms
     (strain $\eps$). SAXS shows hard domains that are only correlated to a
     next neighbor ("sandwich"). Thick sandwiches lengthen more than thin ones.
     Thin-layer sandwiches feature a strain limit. Some are converted into
     thick-layer sandwiches. 2 materials have tough hard domains. Material
     processed at 235øC is soft and contains weak hard domains that fail for
     $\eps > 0.75$.