DescriptionWill there be plastic materials in a world without fossil carbon sources? Likely yes. Already the annual production of biomass exceeds the predicted total reserves of petroleum. But there is still a long way from biopolymers to competitive plastics: only 1% of the global market is currently based on renewable resources. Major problems: (i) Changing quality of raw material; (ii) lack of experience; (iii) increasing demand of agro-production for food; (iv) priority given to bio-energy.;;The criteria usually characterizing materials as either “bio-based” and “bio-degradable” or “petro-based” and “non- (i.e. very sluggishly) degradable” are no longer conditional. The petrochemical industry produces materials, that readily bio-degrade. From biomass routes have recently been developed to long-lived commodity plastics, such as polyethylene or polypropylene.;;That bio-plastics can substitute for fossil-based materials for a multitude of applications, is exemplified for the development of PHB-based polyester-urethanes. PHB and PHB-V ( poly-3-hydroxy-butyrate and poly-3-hydroxy-butyrate-co-valerate ) are fermentation products from agrarian waste (molasses, glycerol from bio-diesel, whey etc.). PHB is a nearly ideal polymer concerning aspects of sustainability, however, it is unfavourable from its material properties. We have solved these problems by converting PHB into polyester-urethanes (PEU), tough-elastic materials with a highly increased melting range. Their properties are determined mainly by the structure and input ratio of the components, ranging from highly elastic to hard, but throughout hydrophobic. We could substantially decrease the cost of production by preparing BLENDS or COMPOSITES, which can be prepared to have properties similar to conventional plastics, like e.g. high-density polyethylene or compounded polypropylene.;;Talk introduced by Mr. Mostafa Zedan.
H. Seliger: Study of Chemistry. Ph.D. 1966 on "Approaches to the Synthesis of Oligonucleotides on Polymeric Supports" at the Max-Planck-Institute für Experimentelle Medizin in Göttingen (supervisor: F. Cramer). 1968 - 1969 Postdoctoral Fellow at Northwestern University, Evanston, USA (with R.L. Letsinger). 1969 - 1976 Assistant in the Institute for Macromolecular Chemistry, University of Freiburg (Hermann-Staudinger Institute, with Prof. E. Husemann). Habilitation for Macromolecular Chemistry. 1976 - 2002 Professor and Head of the Polymer Division of the University of Ulm. 2002 (official retirement) - 2008 Provisional head of the Division of Chemical Functions in Biosystems at the University of Ulm, later Research Group of Chemical Functions in Biosystems. 2009 - 2011 Director of the Laboratory for Chemical Functions in Biosystems, working for Antisense Pharma Co., in the Biotechnology Center of the “Technologie Foerderungs-Unternehmen GmbH” (TFU) in Ulm. since 2002 Founding Dean for Biotechnology in the Faculty of Pharmacy and Biotechnology of the German University in Cairo. Teaching: 1979 - 2008: Polymer Chemistry, focus on Biopolymers. Biomaterials. Biochemistry. Introductory and Advanced Practical Courses on Polymer Chemistry. 1990 -2000: Organizer and Chairman of the Graduate Study Program “Biomolecular Medicine”. 2000, 2001: Introduction to Combinatorial Nucleic Acid Synthesis; Oligonucleotide Libraries and their Applications. Since 2004: Lecture “Principles of Macromolecular Chemistry Determine the Behaviour of Biomaterials as well as of Synthetic Polymers” in the International Master Course “Advanced Materials” at the University of Ulm. Since 2003: Lectures on “Colours of Biotechnology” and on “Some Basic Principles of Biopolymers” at the German University in Cairo. Research: Synthesis of oligo- and polynucleotides mainly with application of the solid-phase technique. Structurally modified oligonucleotides of potential therapeutic interest. Combinatorial nucleic acid chemistry. Oligonucleotide-loaded nanoparticles. Synthesis of bio-polyester-urethanes on the basis of renewable resources, in particular biogenic poly-3-hydroxy-alkanoates.
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