A bio-based membrane was developed for building envelope applications. Biocomposites with enhanced water vapor permeability were fabricated based on poly(lactic acid) (PLA) and cellulose microfibers (CMF). To improve the interfacial adhesion between PLA and fibers. polyethylene glycol (PEG) was used as a compatibilizer for the modification of CMF. https://www.duospiritalis.com/