• R A Mashelkar

      Articles written in Journal of Chemical Sciences

    • Whither polymer engineering

      R A Mashelkar

      More Details Abstract Fulltext PDF

      Polymer science and engineering is a truly multidisciplinary area. Polymer synthesis in itself is important, but the role played by non-Newtonian fluid mechanics, rheology and the important interactions of these in polymer processing are indeed very unique. An overview of some of the recent and exciting developments in polymer engineering is presented which outline dimensions for future research. The role of polymer engineering in modern polymer development and absorption has been highlighted with special reference to Indian conditions.

    • Diffusional transport from structurally variant hydrogels

      V Premnath V S Vadalkar M G Kulkarni R A Mashelkar

      More Details Abstract Fulltext PDF

      Diffusional release of solutes from polymer matrices undergoing structural changes has been analysed by incorporating the dependence of solute diffusivity on time. The functional dependence of diffusivity with time has been experimentally verified and its utility and limitations are discussed. Criteria for predicting release characteristics have been arrived at based on two model parameters,K and β. HereK represents the reciprocal of the time required for the structural change and β is the ratio of the solute diffusivity prior to the onset and after the completion of the structural change. The criteria, which are independent of the mechanistic details of the structural change, have been validated by analysing solute release from polymeric matrices undergoing diverse structural changes. The approach should be useful in predicting the relase characteristics of solutes on the basis of the physicochemical characteristics of the polymer-solute systems. It should also help in tailoring the polymers to obtain the desired release kinetics.

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