Dr.A.Narender
A systematic measurement of dielectric constant (ε) and loss (tanδ) on powder pressed pellets of AMPS with AA, MAA and MBA copolymers in composition 50/50 have been carried out in the frequency range 200Hz – 100 kHz and in the temperature range from room temperature to180oC covering through the glass transition temperature (Tg). Relaxation peaks were observed (above Tg )from tanδ versus temperature curves. The peaks are attributed to α – relaxations. Further the peaks shift towards higher temperatures for higher frequencies. The AC conductivity has also been evaluated from the data. The results are discussed in the light of substituent effect in the copolymer.
English 
Spanish 
Chinese 
Russian 
German 
Japanese 
Portuguese 
Hindi