THERMAL ANNEALİNG AND REFRACTIVE INDEX MONITORING OF POLYPROPYLENE FİLM

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Communications Faculty of Sciences University Ankara Series A2-A3 Physical and Engineering
Volume:49 Issue:02
THERMAL ANNEALİNG AND REFRACTIVE INDEX MONITORING OF POLYPROPYLENE FİLM

THERMAL ANNEALİNG AND REFRACTIVE INDEX MONITORING OF POLYPROPYLENE FİLM

Authors : A A ALGHAMDI

Pages : 0-0

Doi:10.1501/commua1-2_0000000031

View : 14 | Download : 6

Publication Date : 2005-01-01

Article Type : Research Paper

Abstract :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.
Keywords : Polypropylene, Annealing Technique, Inffa red

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