海洋塑料污染之忧 - Dialogue Earth
据估计，海洋中漂浮着超过5万亿块的塑料碎片。 如果我们继续以目前的速度生产塑料，到2050年海洋中塑料的数量将超过鱼类总量。 研究还表明，有800多种沿 ...
海水中降解
研发人员正在研究如何才能阻止塑料进入海洋。一家名为“ 海洋清理”的荷兰公司发明了一个巨大的漂浮围栏，可以吸附“大太平洋垃圾带”中的塑料垃圾。在中国港口城市厦门，大学的研究人员正在开发一种 摄像头监控系统，用来识别塑料并预测其漂浮轨迹，这样他们就可以在塑料进入海洋前进行拦截。欧洲航天局甚至利用卫星从太空追踪 塑料垃圾，希望通过这种方式为出台新的限塑令提供依据。生物降解塑料开发取得的进展也可能对海洋健康产生巨大影响：研究人员目前正在研究一种可以在 <anchor>海水中降解</anchor> 的生物塑料，从而最终减少在海水中的垃圾数量。
Made to degrade (eventually) | EurekAlert!
News Release
23-Mar-2020

# Made to degrade (eventually)

Marine biodegradable plastics with high strength and water resistance developed from starch and cellulose

Osaka University

image: Marine biodegradable plastic preparation from starch and cellulose? view more

Credit: Osaka University

The main cause of marine debris accumulation is the dumping of plastic waste into the oceans, as most plastic does not degrade when left in the environment. Marine biodegradable plastics have previously been developed in Japan, with PHBH (by Kaneka Corporation) and PBS (by Mitsubishi Chemical Corporation) currently available. However, these are both categorized as aliphatic polyesters and are of poor quality compared to conventional plastics, such as polyethylene and polypropylene, while being producible only in low yields (approximately tens of thousands of tons per year compared to an annual global production of 300 million tons for conventional plastics) and at more than twice the cost of that of conventional plastics, all of which are factors that have limited their use. Thus, there has been a strong demand for the development of a low-cost and mass-producible marine biodegradable plastic that can enable us to tackle the growing problem of marine debris.

A group of researchers led by Associate Professor Taka-Aki Asoh and Professor Hiroshi Uyama of the Graduate School of Engineering, Osaka University, has, in collaboration with Nihon Shokuhin Kako Co., combined the ubiquitous biomasses starch, the main component of the carbohydrates found in corn, tubers, and roots such as potatoes, and cellulose, the main component of plants and commonly known as cotton fiber, to develop a marine biodegradable plastic. Because this combination was done using their unique technology, the water-resistance of starch improved significantly, and the resultant composite sheet material demonstrated excellent water-resistance and high strength in addition to its high levels of biodegradability in seawater.

Associate Professor Asoh says, "Since we were able to develop a marine biodegradable plastic sheet by combining familiar materials such as starch and cellulose, because these materials are cheap, and the manufacturing process is simple, we can expect that the developed material will be put to practical use soon. We have great expectations that our material will help solve the growing global problem of marine debris accumulation and have a major societal impact." On the effects of their newly developed technique, Professor Uyama adds, "The effective use of low-cost biomass, which is what is afforded by our technique, will lead to a reduction in greenhouse gas (e.g., CO2) emissions, thereby positioning this technology among the key environmental technologies emerging from Japan for the ratification of the Paris agreement."

This product is expected to not only contribute significantly to a reduction in the amount of new marine debris deposited globally, but also to a more efficient and sustainable material cycling process and to the reduction of greenhouse gases, giving it the potential to enable the realization of the United Nation's Sustainable Development Goals, the COP25, and the policies of the Japanese government-led Moonshot Program (Target 4, resource circulation).

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About Osaka University

Osaka University was founded in 1931 as one of the seven imperial universities of Japan and now has expanded to one of Japan's leading comprehensive universities. The University has now embarked on open research revolution from a position as Japan's most innovative university and among the most innovative institutions in the world according to Reuters 2015 Top 100 Innovative Universities and the Nature Index Innovation 2017. The university's ability to innovate from the stage of fundamental research through the creation of useful technology with economic impact stems from its broad disciplinary spectrum.

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Media Contact

Saori Obayashi

Osaka University

Office: 81-661-055-886

### More on this News Release

Osaka University

Funder
New Energy and Industrial Technology Development Organization

#### Keywords

- /Physical sciences/Materials science/Materials/Polymers/Synthetic polymers/Plastics/Biodegradable plastics
- /Physical sciences/Earth sciences/Atmospheric science/Atmospheric chemistry/Atmospheric gases/Greenhouse gases
- /Physical sciences/Materials science/Materials/Composite materials

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