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In the present book optical and thermal properties of some amorphous materials like polymers, graft copolymers and glasses have been discussed detail. The first part of the book (Chapter 3) gives an introduction of polymeric materials including their classification schemes, methods of graft copolymerization and potentiality of Photoacoustic Spectroscopy (PAS) technique over other technique for studying the two -phase systems. In the second part of the book (Chapter 4) variation in thermophysical properties of these PMMA-g-PC copolymers with grafting of PMMA have been made. A direct relation...