Accession Number : ADA337927

Title :   The Effect of Strain on the Morphology and Mechanical Properties of Thermoplastic Polyurethane Elastomers (TPEs).

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Crawford, Dawn M. ; Teets, Alan R.

PDF Url : ADA337927

Report Date : DEC 1997

Pagination or Media Count : 38

Abstract : The research discussed herein entails an investigation of the effect of strain on polymer morphology. Model thermoplastic polyurethane elastomers (TPEs) were subjected to tensile strains between 100% and 400% elongation and aged for varying lengths of time at ambient and elevated temperature. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were used to investigate the changes in morphology that occurred as a result of strain elongation. The effect of aging was also related to the TPE's mechanical properties such as abrasion resistance. DSC results indicate that the polymer undergoes morphology changes due to strain, resulting in some degree of phase mixing. DMA data suggest that strain aging causes a minor change in the glass transition temperature (Tg) but a significant change in the peak magnitude of E" and tan delta.

Descriptors :   *ELASTOMERS, *THERMOPLASTIC RESINS, SCANNING, MECHANICAL PROPERTIES, MODELS, HIGH TEMPERATURE, TENSILE STRESS, MORPHOLOGY, GLASS, TIME, TRANSITION TEMPERATURE, MIXING, POLYURETHANE RESINS, WEAR RESISTANCE, CALORIMETRY.

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE