REFERENCE

-J.A. Brydson,rubber chemistry, allied science publishers, london 1978
-M.M Morton,Rubber technology,Van Nostrand Reinhold
-D.C Blackley ,High Polymer lattices
-Paul C.painter and Michael M.coleman,Fundamentals Polymer Science
-D.W Van Krevelen And P.J Hoftyzen, Properties Of Polymer
-D.A Seanor ,Electrical Properties Of  Polymers,Academic press ,New York
-Richard C.Progelhof James.L.Throne, Polymer Engineering Principles,Hanser Publisher Munich