Abstract: Carbonaceous residues obtained by carbonizing virgin and various coal-polymer mixtures in a micro autoclave at temperatures of 350℃ and 400℃ were investigated by scanning electron microscopy. Results show that hydrogen-rich macerals are disintegrated while other macerals like fusain, and exinite are resistant to disintegration. Addition of polymers like low & high density polypropylene and polystyrene leads to an increased disintegration of the macerals and alters the morphologies of the residues.