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New Developments in Thermoplastic Polyurethanes of Variable Crystallinity: Sensitivity of Cyclic Stress-Strain Response to Chemical Structure by Cristina Prisacariu; Elena Scortanu; Anton Airinei; Bogdan Agapie; Maksym Iurzhenko; Ye. P. Mamunya is a Engineering article available to read on EtoBox.

What is New Developments in Thermoplastic Polyurethanes of Variable Crystallinity: Sensitivity of Cyclic Stress-Strain Response to Chemical Structure about?

A study was made of how aspects of the mechanical and thermal responses of thermoplastic polyurethane elastomers vary with composition: the hard segment, soft segment and chain extender were varied systematically with the aim of improving understanding of the relationship between molecular/supramolecular architecture at the nm-scale and macroscopic mechanical properties in such systems. Two hard segments were compared, generated from 4,4'-methylene bis(phenyl isocyanate) (MDI), or 4,4'-dibenzyldiisocyanate (DBDI). Rotation around the -CH 2 -CH 2 -bridge in DBDI allows alignment of aromatic rings and crystallization within the hard phase, which is not available with MDI. The physical structures were characterized by dynamic mechanical analysis (DMA) and by X-ray scattering (SAXS and WAXS) revealing signicant variations in degree of phase separation and degree of crystallinity, especially in the DBDI-based polymers. The presence of DBDI hard segments instead of MDI led systematically to increases in: the input strain energy to a given elongation, hysteresis and residual strain under cyclic loading, and stress relaxation. Stress-strain cycles reflect the resistance to plastic deforma

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Author

Cristina Prisacariu; Elena Scortanu; Anton Airinei; Bogdan Agapie; Maksym Iurzhenko; Ye. P. Mamunya

Publisher

Elsevier ; [Oxford]: Elsevier Ltd.; Elsevier BV (ISSN 1877-7058)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)