Introduction to polymer physics, commercially important polymers, structural factors controlling behavior of polymer solids, inter- and intra-molecular interactions in polymers, glass transition, phenomenology of glass transition, theories of glass transition, thermodynamic and kinetic aspects of glass transition, molecular parameters afecting glass transition temperature, Rubber elasticity, phenomenological and statistical theories of rubber elasticity, relaxation spectra, creep, physical ageing. Polymer networks, gel point, network density, swelling behavior, mechanical response of cross-linked polymers. Introduction to polymer blends and alloys, molecular weight dependence of polymer miscibility, phase transitions in polymer blends, models of mechanical response of polymer blends.