In Honor of Reimund Stadler
2019; Wiley; Volume: 220; Issue: 20 Linguagem: Inglês
10.1002/macp.201900370
ISSN1521-3935
Autores Tópico(s)Polymer Nanocomposites and Properties
ResumoReimund Stadler (1956–1998) (Figure 1) had a great impact in polymer science, although his life was short. After graduating in chemistry at the Albert-Ludwigs-Universität Freiburg, he received his doctoral degree with distinction under the supervision of Prof. Wolfram Gronski at the Institute of Macromolecular Chemistry (Hermann-Staudinger Haus) in 1983. The title of his thesis was “Viscoelasticity and Stress Induced Crystallization in Thermoplastic Elastomers,” which already contained many aspects of his later works. In his thesis, Reimund Stadler worked on mechanical and rheological properties of block copolymers, which he synthesized by living anionic polymerization.1, 2 After a short postdoctoral visit at the Universidade Federal do Rio Grande do Sul in Porto Alegre, he returned to Freiburg in 1984 and built a team at the chair of Prof. Hans-Joachim Cantow, where he focused on rheological properties of elastomers carrying hydrogen bonding motifs (“stickers”),3-5 but also worked on chemically crosslinked networks,6-10 semi-interpenetrating networks,11-14 and polymer blends,4, 15 and started his works on ABC triblock copolymers. He finished his habilitation in Macromolecular Chemistry in 1988 and then moved, as an associate professor in Organic and Macromolecular Chemistry, to the Johannes Gutenberg-Universität Mainz, Institute of Organic Chemistry, in 1989, where he was later appointed to full professor in 1991 after declining an offer from Northwestern University in Chicago. During the years in Mainz his group continued to work on blends16, 17 and semi-interpenetrating networks,18, 19 polymers with hydrogen bonding groups,17, 20-33 with strong influence on works of other teams at the same time and later on,34-37 but also extended the chemistry on triazoline dions into the direction of Diels–Alder polymers,38-41 developed a synthetic route to polydialkylaminoisoprenes,42, 43 block copolymers with branched topologies,44-46 with a focus on linear ABC triblock copolymers,47-54 which actually started with their use as compatibilizers in a polymer blend.55-57 While he declined an offer from the Leibniz-Institut für Polymerforschung Dresden in 1994, he accepted an offer from the Universität Bayreuth and became full professor in Macromolecular Chemistry in 1997, where he stayed for the remainder of his career. During the last year of his life, Reimund Stadler successfully applied for the Collaborative Research Center (SFB 481) entitled “Macromolecules in Internal and External Fields” at the University of Bayreuth. Within this center, a number of studies on block copolymers,58-68 including hybrid block copolymers obtained from the combination of living anionic polymerization and enzymatic polymerization,69 were carried out. Among the areas, in which he left big foot prints in the fields of block copolymers (especially ABC triblock copolymers) and polymer networks (especially thermoreversible networks by hydrogen bonding) are possibly the most prominent ones. His work stimulated many others in the field and 20 years after his death scientists from all over the world met in Mainz on 16 October 2018 for a 1-day symposium held in his memory. Besides former colleagues and friends, former students and some members of his family also attended the meeting, which was hosted by the Max-Planck-Institute for Polymer Research and received a generous financial support by BASF AG (Figure 2). To commemorate this, we decided to edit a dedicated special issue to his memory, where some of the speakers and some other researchers with personal and/or scientific links to Reimund Stadler could contribute manuscripts about their current research that is still inspired by his work. This collection starts with a trend article by Nikos Hadjichristidis and Alejandro Müller and co-workers on the morphology, crystallization behavior and properties of multi-crystalline polymer systems based on triple crystalline triblock terpolymers (1900292). This topic is very well aligned with Reimund Stadler's research interest in the field of block copolymers with at least one crystalizable block.59, 64 The work of Reimund Stadler in the field of block copolymers resonates in the following scientific contributions. Volker Abetz and co-workers report planet-like nanostructures formed by an asymmetric triblock terpolymer (1900297). This structure is close to the helical morphology which was found by Stadler's group51 and studied in more detail later.70 Manfred Wilhelm and co-workers discuss polyelectrolyte hydrogels that are formed by self-assembly of amphiphilic ABA triblock copolymers. The influence of the BCP composition on the rheological properties is tediously studied and discussed (1900093). Markus Gallei and co-workers developed a universal strategy for the preparation of functional poly(methacrylate)s grafted (PMA) to polystyrene-block-polyisoprene (PS-b-PI) BCPs via a convenient postmodification strategy and reports the properties of the developed materials (1800548). Martin Weber and co-workers report the synthesis and in-depth characterization of segmented block copolymers based on polyarylethersulfones and various aliphatic polyethers. As polyarylethersulfones belong to the group of established membrane materials and are mainly used for production of ultra- and microfiltration membranes the authors studied their newly developed materials in membrane applications (1900305). Andreas Walther and co-workers introduced a pH-responsive block into ABC triblock terpolymers to finely modulate their self-assembly. Sequential reversible addition fragmentation chain transfer (RAFT) polymerization was used for the synthesis of the polymers and interesting structures were observed by step-wise solvent exchange (1900131). Yusuf Yagci and co-workers report a facile and efficient route for synthesizing hydrophilicity tunable hyperbranched polymers (1900055). They were able to manipulate the branching densities and hydrophilicity of the hyperbranched polymers easily and with this extend the various approaches towards topologically challenging polymers developed in the Stadler group.71-74 Reimund Stadler's work in the field of glycopolymers69, 75-81 inspired the scientific contributions by Ruben R. Rosencrantz, Alexander Böker and co-workers and by Katja Loos and co-workers. In the former contribution the authors discuss the synthesis of glycomonomers via a regioselective, microwave-assisted approach starting from lactose. The resulting monomers are polymerized by RAFT and immobilized on gold surfaces using the trithiocarbonate group of the chain transfer agent allowing them to reveal specific interactions of their developed surfaces (1900293). In the latter contribution glycomonomers are synthesized via biocatalytic pathways and subsequently polymerized via enzymatic polymerization rendering this a fully green approach towards glyopolymers (1900293). We hope that this special issue will help the reader to get a grasp of the scientific fields opened by Reimund Stadler and to inspire to work on the open scientific and technological questions in this area. We would like to thank all contributors to the symposium in October 2018, our co-organizers Kurt Kremer of the Max Planck Institute for Polymer Research, and Rudolf Zentel of the Johannes Gutenberg University Mainz and all authors of this special issue for their excellent contributions and for their continuous efforts to advance the field of polymer science. Volker Abetz Katja Loos
Referência(s)