Bifunctional Roles of Dialdehyde Cellulose Nanocrystals in Reinforcing and Cross-Linking Electrospun Chitosan Nanofibrous Membranes
The composite nanofibrous membranes were electrospun by adding separately dialdehyde cellulose nanocrystals (DACNCs) and cellulose nanocrystals (CNCs) as the nanofillers into chitosan (CS) matrix. The morphology, chemical structure, thermal stability and mechanical properties of as-prepared composite membranes were investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric (TGA) and mechanical test, respectively. It is found that significant enhancements in the mechanical properties and thermal stability of CS nanofibrous membranes could be achieved by introducing a small amount of cellulose-based nanofillers. Moreover, greater improvements could be found in the presence of the DACNCs, which could be attributed to the bifunctional roles of DACNCs played simultaneously as the reinforcing and cross-linking reagents for CS nanofibrous membranes.
This work has been financially supported by Program for Innovative Research Team in University of Ministry of Education of China (IRT_16R13). Prof. Qin also appreciates the Talent Support Program for the Western Shandong Economy Uplift Belt (2017).