Chemistry
Bamboo, a remarkable renewable resource, can be transformed into a rigid, moldable plastic suitable for automobiles and household items.
By Alex Wilkins
Bamboo plants are a fast-growing, renewable resource
James Freeman / Alamy
Bamboo-derived plastic exhibits comparable strength and durability to traditional plastics used in household appliances and automotive interiors, while also being recyclable and capable of biodegradation in soil.
Bioplastics are becoming more favored, despite comprising only about 0.5% of over 400 million tons of yearly plastic production. Their adoption is hindered by a lack of mechanical strength relative to conventional oil-based plastics and challenges in fitting into widely used manufacturing techniques.
Recently, Dawei Zhao from Shenyang University of Chemical Technology in China and his team have devised a method to derive plastic from bamboo cellulose, achieving or even exceeding the performance characteristics of many common plastics.
“Due to the rapid growth of bamboo, it stands out as a sustainable alternative to traditional wood resources; however, its applications mostly remain in conventional woven products,” mentions Zhao.
The team initiated the process by treating bamboo with zinc chloride and a straightforward acid to break earthy chemical bonds, yielding smaller cellulose molecules. They introduced ethanol to reorganize these cellulose molecules into a robust, solidified plastic.
This bamboo-based plastic’s toughness is on par with engineering-grade plastics used in vehicles and construction, notes Andrew Dove from the University of Birmingham, UK, who did not participate in the research.
A sheet of plastic made from bamboo
Dawei Zhao
Nevertheless, due to its structural rigidity, its potential applications may not be extensive. “It’s unlikely to rival the most prevalent packaging plastics like polyethylene and polypropylene,” notes Dove. “However, by focusing on a niche of engineering plastics, it could alleviate some supply concerns in that specific sector.”
Although the production cost is higher than that of many conventional plastics, Zhao and his team disclosed that the bamboo plastic is entirely recyclable, retaining 90% of its original strength, which may enhance its economic appeal. Additionally, they claim biodegradability within 50 days, despite doubts raised about the validity of this assertion for other biodegradable materials.
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