We introduce a green and facile method to compatibilize hydrophobic polylactide (PLA) with hydrophilic cellulose nanofibers (CNF) by using ionic liquid ([DBNH][OAc]) welding with a cosolvent system (gamma-valerolactone). Such welding affords strong (230 MPa tensile strength), flexible (13% elongation at break), transparent (>90%) and defect-free CNF/PLA films. The films are biodegradable in marine environments (70% degradation in 7 weeks), facilitating the otherwise slow PLA decomposition. Physical, chemical and structural features of the films before and after welding are compared and factored in the trends observed for degradation in seawater. The results point to the possibility of PLA-based films forming a co-continuous system with nanocellulose to achieve an improved performance. The role of film morphology, hydrophobicity, and crystallinity is discussed to add to the prospects for packaging materials that simultaneously display accelerated degradability in marine environments.

我们介绍了一种绿色便捷的方法，通过使用离子液体（[DBNH] [OAc]）和共溶剂系统（γ-戊内酯）进行焊接，使疏水性聚丙交酯（PLA）与亲水性纤维素纳米纤维（CNF）相容。这种焊接可提供牢固的（230 MPa的拉伸强度），柔性的（断裂伸长率13％），透明的（> 90％）和无缺陷的CNF / PLA膜。该膜在海洋环境中可生物降解（7周内降解70％），从而有助于原本缓慢的PLA分解。比较了焊接前后薄膜的物理，化学和结构特征，并考虑了海水降解的趋势。结果表明，基于PLA的薄膜与纳米纤维素形成共连续体系以实现更高性能的可能性。薄膜形态，疏水性的作用