Cairo University

MTPR Journal

 

Correlation between Structural and Electrical Properties of Polyvinylidene Fluoride in the Pure State and with some Additives at Different Temperatures

2019-04-21
G. M. Nasr, L. M. Salah*, S. E. H. El-Massry 1, Y.H. Elbashar3 and A.S. Abdel-Rahman1,3*
1Department of Physics, Faculty of Science, Cairo University, Egypt
2Department of Physics, Faculty of Science, Benha University,Egypt
3Egypt Nanotechnology Center (EGNC), Cairo University, Egypt

Vol./Issue: 19 , id: 272

Internal friction is a very important mechanical property of matter which can be determined by many techniques, such as the pulse excitation technique and the torsional pendulum. In this paper we used the pulse excitation technique as it is non-contact, easy used and not affecting the sample, reliable, low cost, and accurate and suiting a wide variety of rubbery materials and elastomers. The samples chosen for this work is made of butadiene acrylonitrile rubber (NBR), which are loaded by different phr of N774 nanocarbon. The measured sample is prepared in form of 200 mm long string, having a homogenous circular cross-section of 3 mm diameter. A mechanical pulse is produced and delivered to the fixed end sample by mean of a punch from a small solenoid motor plunger. To generate a shadowgraph for the vibrating sample on a silicone photodiode, a laser beam is used. A storage oscilloscope is used to capture the natural resonance amplitude decay profile of the test sample from the obtained electric signal. The internal friction is obtained by mathematical analysis of the acquired data.