Dr Sotirios Grammatikos, University of Bath

Anomalous behaviour of fibre reinforced polymers exposed to environmental aging
When Nov 02, 2015
from 02:00 PM to 03:00 PM
Where LR8
Contact Name
Contact Phone 01865-273925
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In this seminar, the anomalous behaviour of polymer composites subjected to hygrothermal aging will be discussed in reference to the results of a characterization study on polyester matrix fibre reinforced polymer (FRP) composites. Hygrothermal aging, the combination of moisture and elevated temperatures, has been proven to affect the durability of FRPs. Significant structural degradation can be expected as a consequence of hygrothermal aging, however it has been shown that some material properties exhibit a strong non-linear and even beneficial behaviour as a consequence of hygrothermal exposure, indicating the presence of competing mechanisms. To study these different mechanisms which control the structural performance of the exposed material, moisture absorption characteristics and mechanical performance were assessed at prescribed time frames. With a view to examining any induced physical or chemical changes due to aging, Dynamic Mechanical Thermal Analysis (DMTA), Scanning Electron Microscopy (SEM) and Infrared spectroscopy were also employed. Lastly, impedance spectroscopy was used as a tool to follow hygrothermal aging/moisture absorption during exposure.