News Release 

Degradable plastic by DMDO: 'Unnecessary' component key

An efficient manufacturing method for multifunctional bio/chemo-degradable plastics

Shinshu University

Associate Professor Kohsaka states, "The fun part of polymer science is that your results are tangible. You can measure, quantify and even feel the properties of the plastic that you produce!" Associate Professor Yasuhiro Kohsaka of the Research Initiative for Supra-Materials (RISM) and Mai Yamashita (Graduate School of Textile Science and Technology) et al. of Shinshu University built upon a plastic reported by a research group lead by Professor Xiao-Bing Lu of Dalian University of Technology. With the study "Synthesis of Poly(Conjugated Ester)s by Ring-Opening Polymerization of Cyclic Hemiacetal Ester Bearing Acryl Skeleton", Associate Professor Kohsaka and his colleagues developed a new polyester, enabling simple and inexpensive production. The research demonstrated that this plastic, prepared by 2,6-dimethyl-5-methylene-1,3-dioxan-4-one (abbreviation: DMDO), reacts with chemical substances and decomposes. These results are anticipated to lead to a possible solution of the plastic waste problem. The research paper was published as an invited paper in European Polymer Journal (Elsevier; Switzerland) on August 25, 2019.

The polymerization reaction in the study was performed by adding alcohol as a reaction initiator to DMDO and diphenyl phosphate as a catalyst. According to the theory, DMDO should be incorporated into the polymer skeleton as it is, but it was found that a structure partially missing from DMDO is incorporated into the polymer skeleton. The raw material is DMDO, but the product has the same chemical structure as the polymer polymerized by α-methylene-β-butyrolactone, MβBL. DMDO contains useless chemical structures that cannot be incorporated into polymers, but it can be synthesized from existing basic chemicals at room temperature and pressure, and can be stored stably.

In other words, productivity and storage are overwhelmingly superior to MβBL. Therefore, it is viewed as a possible alternative raw material for MβBL. Research is being continued to add functions such as heat resistance, water repellency, and shape memory to degradable plastics.

Ms. Mai Yamashita, co-author and a first year Masters student in Dr. Kohsaka's lab says that "my professor often says that chemistry experiments is a lot like cooking. We follow a recipe, and you have multiple pots cooking at the same time. I think that if you enjoy "cooking", even if you're not good at it in the beginning, if you continue to work on problems you will get better. Science is a fact-based discipline but I think emotions play a role in whether you will make progress or not. I really enjoy the process of experiments, and I believe good results will follow if I continue to do what I love."

Please view the video for more information on the study.

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