- Communications Faculty of Sciences University Ankara Series A2-A3 Physical and Engineering
- Vol: 49 Issue: 02
- THERMAL ANNEALİNG AND REFRACTIVE INDEX MONITORING OF POLYPROPYLENE FİLM
THERMAL ANNEALİNG AND REFRACTIVE INDEX MONITORING OF POLYPROPYLENE FİLM
Authors : A. A. Al-ghamdi
Pages : 0-0
Doi:10.1501/commua1-2_0000000031
View : 5 | Download : 1
Publication Date : 2005-01-01
Article Type : Research
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