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Process Induced Micro Structure Evolution in Polyester Polyurethane and Mechanical Properties Relationship
Author(s) -
Frick Achim,
Mikoszek Marzena
Publication year - 2012
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000106
Subject(s) - materials science , thermoplastic polyurethane , scanning electron microscope , composite material , polyurethane , differential scanning calorimetry , optical microscope , ultimate tensile strength , polyester , shore durometer , thermoplastic , deformation (meteorology) , thermoplastic elastomer , elastomer , polymer , copolymer , physics , thermodynamics
Summary: MDI‐HQEE‐Capa based thermoplastic polyurethane (TPU) with Shore hardness of 94 A was injection molded. In order to study the influence of melt conditions on the material structure evolution and resulting mechanical properties a systematical variation in processing temperatures in the range between 195 °C and 250 °C was applied. The mold temperature was kept constant at 60 °C. Process induced samples morphologies were investigated by means of light microscope (LM), scanning electron microscope (SEM) and differential scanning calorimeter (DSC). Mechanical visco‐elastic properties were determined by means of cyclic tensile experiment and were correlated with results of structural investigations. The evaluation of morphology micrographs of raw TPU material and specimens molded at different temperatures shows a reduction in visual crystalline fraction. This gains a distinct change in the deformation behavior of injection molded TPU with increasing melt processing temperature.