The aim of POLYCHAR 20 is to provide an international forum for all participants, established polymer scientists, young researchers and students, from academia and industry to review the latest research and developments in Material Science and Engineering. The topics of the meetings range from theoretical and fundamental aspects to the most recent advances and novel developments in synthesis, processing, manufacturing and characterization including the prediction of service performance of polymeric materials. Contributions from all fields of Material Science and Engineering are welcome. Due to the large number of queries, abstract submission deadline is extended to 15 November 2011. POLYCHAR 20 participants will be offered an opportunity to enjoy the natural beauty of the country during pre- and post-conference tours. Dubrovnik, the POLYCHAR 20 host city, is a beautiful ancient town situated in the southern part of the Croatian Adriatic coast. The Dubrovnik International Airport is well connected to many major cities of the world, either directly or through the international airports in Zagreb and Split.