Design and development of sustainable polymers with various architectures from bio-renewable feedstocks by development of new strategies and methods by precise catalysis (polymerization) techniques have been attractive and important subjects. Development of functional polymers derived from hydrocarbon-rich molecular biomass (vegetable oils and fatty acids such as linseed, sunflower, soybean, castor, palm, and olive oils), most abundant and low-cost molecular biomass, has thus been recognized as an attractive subject. In particular, development of advanced polyesters, displaying tunable mechanical properties and biodegradability, from so-called bio-based monomers by precise polymerization techniques attracts considerable attention. In this lecture, synthesis of long chain aliphatic polyesters, promising semicrystalline materials expected as alternative to linear polyethylene (widely used in our daily life), especially by acyclic diene metathesis (ADMET) polymerization, including our recent results, will be introduced. These materials can be depolymerized by chemical modification, the approach, conversion of polymer to monomers or fine chemicals called “chemical recycling”, has also been considered as important subject (key technology) to establish green, sustainable circular economy. We also introduce another approach for synthesis of new bio-based polyolefins by using half-titanocene catalysts.
- Approaches for synthesis of bio-based aliphatic polyesters from nonedible plant oil
- Catalysis technology for synthesis of polymers and chemical recycling
- Understanding importance of catalyst design and new methodology