Isothermal annealing technique was used to accelerate the ageing process on prefabricated highly crystalline polypropylene thin films to investigate the specification failure of such films. Samples were held at a constant temperature of 125 °C, for different periods of titne ranging from 1 to 10 hours. A mechanism to describe the observed variations has been proposed. A model for the macrostructure is introduced which explains the observed data. The suggested model helps to identify the role o f relaxation processes by ageing. The periodic changes of the polymer structure were proven by infra-red technique.
Infra-red dispersion properties of the samples were measured in the vvavelength range 2-6.5 micron. The technique exhibited a structural periodic time of 4 hours.
Primary Language | English |
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Subjects | Engineering |
Journal Section | Research Articles |
Authors | |
Publication Date | January 1, 2005 |
Submission Date | January 1, 2005 |
Published in Issue | Year 2005 Volume: 49 Issue: 02 |
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering
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