Schäfer Pascal M, Dankhoff Katja, Rothemund Matthias, Ksiazkiewicz Agnieszka N, Pich Andrij, Schobert Rainer, Weber Birgit, Herres-Pawlis Sonja
Institute of Inorganic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany.
Department of Chemistry, Inorganic Chemistry IV Universität Bayreuth Universitätsstr. 30 95440 Bayreuth Germany.
ChemistryOpen. 2019 Jul 29;8(7):1020-1026. doi: 10.1002/open.201900199. eCollection 2019 Jul.
The synthesis of bio-based and biodegradable plastics is a hot topic in research due to growing environmental problems caused by omnipresent plastics. As a result, polylactide, which has been known for years, has seen a tremendous increase in industrial production. Nevertheless, the manufacturing process using the toxic catalyst Sn(Oct) is very critical. As an alternative, five zinc acetate complexes have been synthesized with Schiff base-like ligands that exhibit high activity in the ring-opening polymerization of non-purified lactide. The systems bear different side arms in the ligand scaffold. The influence of these substituents has been analyzed. For a detailed description of the catalytic activities, the rate constants and were determined using in-situ Raman spectroscopy at a temperature of 150 °C. The polymers produced have molar masses of up to 71 000 g mol and are therefore suitable for a variety of applications. Toxicity measurements carried out for these complexes proved the nontoxicity of the systems.
由于无处不在的塑料所引发的日益严重的环境问题，生物基和可生物降解塑料的合成成为研究热点。因此，已为人熟知多年的聚乳酸在工业生产中实现了大幅增长。然而，使用有毒催化剂二辛酸亚锡的制造工艺至关重要。作为替代方案，已合成了五种带有类席夫碱配体的醋酸锌配合物，它们在非纯化丙交酯的开环聚合反应中表现出高活性。这些体系在配体骨架上带有不同的侧链。已分析了这些取代基的影响。为详细描述催化活性，在150 °C温度下使用原位拉曼光谱法测定了速率常数 和 。所生产的聚合物摩尔质量高达71 000 g mol ，因此适用于多种应用。对这些配合物进行的毒性测量证明了该体系无毒。
