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Title: Process depending morphology and resulting physical properties of TPU

Thermoplastic polyurethane (TPU) is a rubber like material with outstanding properties, e.g. for seal applications. TPU basically provides high strength, low frictional behavior and excellent wear resistance. Though, due to segmented structure of TPU, which is composed of hard segments (HSs) and soft segments (SSs), physical properties depend strongly on the morphological arrangement of the phase separated HSs at a certain ratio of HSs to SSs. It is obvious that the TPU deforms differently depending on its bulk morphology. Basically, the morphology can either consist of HSs segregated into small domains, which are well dispersed in the SS matrix or of few strongly phase separated large size HS domains embedded in the SS matrix. The morphology development is hardly ruled by the melt processing conditions of the TPU. Depending on the morphology, TPU provides quite different physical properties with respect to strength, deformation behavior, thermal stability, creep resistance and tribological performance. The paper deals with the influence of important melt processing parameters, such as temperature, pressure and shear conditions, on the resulting physical properties tested by tensile and relaxation experiments. Furthermore the morphology is studied employing differential scanning calorimeter (DSC), transmission light microscopy (TLM), scanning electron beam microscopy (SEM) andmore » transmission electron beam microscopy (TEM) investigations. Correlations between processing conditions and resulting TPU material properties are elaborated. Flow and shear simulations contribute to the understanding of thermal and flow induced morphology development.« less
Authors:
;  [1]
  1. Institute of Polymer Science and Processing (iPSP), Aalen University (Germany)
Publication Date:
OSTI Identifier:
22494362
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1695; Journal Issue: 1; Conference: GT70 international conference on polymer processing with resulting morphology and properties: Feet in the present and eyes at the future, Salerno (Italy), 15-17 Oct 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALORIMETERS; CALORIMETRY; CREEP; DEFORMATION; ELECTRON BEAMS; ELECTRON SCANNING; MORPHOLOGY; PHYSICAL PROPERTIES; POLYURETHANES; PROCESSING; RELAXATION; RUBBERS; S MATRIX; SCANNING ELECTRON MICROSCOPY; SHEAR; TENSILE PROPERTIES; THERMOPLASTICS; TRANSMISSION ELECTRON MICROSCOPY; WEAR RESISTANCE