讲座题目：How to create bioplastics having degradability and durability
主 讲 人：Tatsuo Kaneko教授,日本北陆先端科学技术大学院大学
The development of high-performance, environmentally-harmonized plastics derived from renewable resources are significant for the establishment of a sustainable society. Most of currently-distributed plastics have very high durability which gives safety, credibility, and validity in our use as a commodity material. However, such durability has caused the serious problems in the environment around seas and rivers, destroying ecological system. Then the plastics keeping durability and showing degradability after use are earnestly desired. In order to create materials having the opposite properties, we synthesized itaconate-bioderived polyamide, where itaconic acid was mass produced from Aspergillus terreus by fermentation of glucose. Itaconic acid reacted with diamine compound to form pyrrolidone ring in the polymer backbone by Michael addition. The polyamide including pyrrolidone group was thermally synthesized without any solvent, which had number-average molecular weights above 34 000 g/mol (PDI: 2.0-3.4 (SEC)), glass transition (Tg) values over 92oC and no melting temperature (Tm). Young’s modulus and mechanical strength of the polyamides showed high values of 1.2-2.3 GPa and 90-113 MPa, respectively, which are superior to conventional aliphatic polyamides such as PA66 and PA6. The polyamides became water-soluble and were corroded. This corrosion was important in terms of overcoming plastic waste problems and especially the endangerment of marine creatures by polyamides such as fish lines. Sunlight including these UV wavelengths, and UV-A and UV-B rays irradiated these plastics to make them corrosive in seawater.
Tatsuo Kanekohas received his Ph. D degree from Tokyo Institute of Technology in May, 1998. He served as an Assistant Professor at Graduate School of Sciences, Faculty of Engineering, Hokkaido University in 1997-2001, and at Graduate School of Engineering, Kagoshima University, in 2001, and then moved to Graduate School of Engineering, Osaka University in 2004. He got Associate Professor in School of Materials Science, Japan Advanced Institute of Science and Technology in 2006. From 2016, Kaneko sensei is a Full Professor in the same university. His research interests cover bio-based Polymers, liquid crystals, gels, polysaccharides, high-performance polymers and self-assembly of polymers. He has published many articles onNature Materials, Angew Chem. Int. Ed., Nanoscale, Adv. Mater., Adv. Functional Mater., Chem. Mater., Macromolecules, etc. He also got many awards from Japan and oversea.