Mechanical spectroscopy of magnetite filled polyurethane shape memory polymers
作者： Muhammad Yasar Razzaq , Mathias Anhalt , Lars Frormann , Bernd Weidenfeller
DOI: 10.1016/J.MSEA.2007.03.059
关键词: Composite material 、 Thermal stability 、 Atmospheric temperature range 、 Mineralogy 、 Thermogravimetry 、 Shape-memory polymer 、 Materials science 、 Dynamic mechanical analysis 、 Thermogravimetric analysis 、 Magnetite 、 Glass transition 、 Mechanical engineering 、 General Materials Science 、 Mechanics of Materials 、 Condensed matter physics
摘要: Abstract Magnetite-polyurethane (PU) shape memory polymer (SMP) composites containing 10–40 vol.% magnetite have been prepared and their mechanical properties in a temperature range from 255 K to 355 K at vibrating frequencies of 0.1 Hz, 1.0 Hz 10 Hz were investigated. The damping peak glass transition around 318 K is decreased by the addition while it becomes simultaneously broader. Also activation energies for main relaxation are varying between 265 kJ/mol 382 kJ/mol with content. storage modulus shows major drop corresponding transition. Storage filled increases 1911 MPa pure PU up 11000 MPa 40 vol.% magnetite. Calorimetric investigations show that slightly lowered content, amount crystallites increased. Additionally, thermogravimetric analyses thermal stability first decomposition step investigated polymer.
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