NIPPON GOMU KYOKAISHI
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Volume 95, Issue 5
Displaying 1-5 of 5 articles from this issue
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Special Issue for General Reviews “SDGs x elastomer materials”
Introductory Remarks
General Reviews
  • Biotechnology-based Butadiene Manufacturing Challenges for Sustainable Synthetic Rubber Materials
    Yoshihide YACHI
    2022 Volume 95 Issue 5 Pages 140-144
    Published: 2022
    Released on J-STAGE: October 15, 2022
    DOIhttps://doi.org/10.2324/gomu.95.140
    JOURNAL FREE ACCESS
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    Corporate activities toward carbon neutrality are becoming active. Chemical material manufacturers are required to manufacture chemical materials that do not depend on fossil resources. Among them, we are conducting research on butadiene production using biotechnology from biomass resources. By estimating the metabolic pathway, we found a unique butadiene metabolic pathway. Furthermore, by introducing a metabolic pathway into Escherichia coli, modifying the enzyme, and examining the culture conditions, 2.1 g/L butadiene production was achieved. Polymerization was carried out using this to obtain a polymer sample. In the future, we will work to further improve productivity and reduce costs for practical use.

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  • Trends in Bioplastics and Efforts for a Development of Bio-polypropylene
    Keiichi TAKI, Nobuyuki KAWASHIMA
    2022 Volume 95 Issue 5 Pages 145-152
    Published: 2022
    Released on J-STAGE: October 15, 2022
    DOIhttps://doi.org/10.2324/gomu.95.145
    JOURNAL FREE ACCESS
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    Many aspects of daily life depend on plastics due to their functionality and convenience. On the other hand, plastics are facing societal challenges such as efficient treatment after-use, leakage to the environment, depletion of fossil resources, and climate change. From the viewpoint of a circular economy, an important countermeasure is to convert fossil resources to biomass, or renewable resources, as a raw material for plastics. This paper introduces the role of bioplastics and the current state of raw material conversion with an emphasis on polyolefins, which account for a large proportion of plastics. In addition, we introduce business and technological examples of bio-polyethylene, which has been societally implemented worldwide among bio-polyolefins. We also provide examples of development and challenges of bio-polypropylene. Further development and utilization of environmentally sound bio-polyolefins should promote a sustainable social system.

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  • Trial Production Using Cellulose Nanofibers
    ―Results of the Nano Cellulose Vehicle Project―
    Arimitsu USUKI
    2022 Volume 95 Issue 5 Pages 153-159
    Published: 2022
    Released on J-STAGE: October 15, 2022
    DOIhttps://doi.org/10.2324/gomu.95.153
    JOURNAL FREE ACCESS
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    Cellulose nanofiber (CNF) is a new class of bio-based materials with characteristics such as high strength, low thermal expansion and low density, and is produced from various sources of cellulose such as plants. CNF is a carbon neutral and renewable material. Nano Cellulose Vehicle (NCV) Project started in October 2016. It is expected that the reduction of vehicle weight leads to better energy efficiency which reduces emission of carbon dioxide (CO2) from vehicles. Contribution to global warming countermeasures is therefore expected. 22 organizations, including domestic universities, research institutes and automobile manufacturers, were working together to put the technology to practical use. At the Tokyo Motor Show 2019, we exhibited a concept car using as many CNFs as possible. The car on display was equipped with 13 CNF components. The evaluation results demonstrated that the use of CNF-based materials is advantageous in reducing the weight of automotive parts.

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Technical Note
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