A hydrophobic and degradable straw based on the ethyl cellulose-coated bacterial cellulose

In light of global petrochemical resource depletion and environmental issues stemming from widespread plastic use, disposable straws present complex issues stemming from their extensive usage, non-recyclability in most areas, and incomplete biodegradability. Therefore, finding a high-performance alternative to mitigate plastic straw-related environmental problems is critical. Cellulose deratives are recognized as sustainable substitutes for plastics, yet the hydrophilic naure restricts their application as straws. This study introduces a microplastic-free straw made from bacterial cellulose (BC). Enhanced with ethyl cellulose (EC), a thermoplastic and water-insoluble cellulose derivative, this BC-based straw exhibits improved mechanical properties (bending strength up to 66.82 MPa), hydrophobicity (water contact angle up to 110°), and heat resistance. These enhancements are attributed to its three-dimensional nanofiber network and intermolecular hydrogen bonds. Moreover, it degrades significantly faster than commercially available polylactic acid-based straw in soil, with completely decomposition within 20 days. This positions the BC-based straw as a more health-conscious and environmentally friendly alternative to plastic straws.