This paper shows nano-scale phenomena relevant to polymer processing. It is organized in foursections. It first addresses the dynamics of polymer chains in confined geometries and shows that in contrary to intuition one may have, polymer chains may diffuse much faster in confined geometries than in the bulk. It then attempts toshade lights on extruder processing of polymer nanocomposites. Understanding of the dynamics of polymer chains in confined geometries helps to achieve the goal. The third section is concerned with the use of nano-objects as nano-reactors. An example is given to show how one may take the advantage of nano-reactors to improve reaction yield and/or reaction selectivity. The last section deals with reaction kinetics at polymer-polymer interfaces, a very important issue in reactive polymer blending processes.
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