Preparation And Properties Of Cellulose Nanocrystalline/bio-based Polymer Composite

Cellulose nanocrystals are a renewable green resource that can be made by using natural fibers that are widely found in nature.In this experiment,medical cotton wool was used as raw material for acid hydrolysis reaction to prepare cellulose nanocrystals to find the optimal preparation conditions of cellulose nanocrystals.The morphology and microstructure of the prepared cellulose nanocrystals were analyzed.The experimental results show that the optimal acid hydrolysis conditions for the preparation of cellulose nanocrystals for medical absorbent cotton fiber are: sulfuric acid concentration 52%,reaction time 80 min,reaction temperature 45 °C.The cellulose nanocrystals prepared by the medical absorbent cotton fiber exhibit a rod shape or a needle shape,and have a length of about 167-400 nm and a diameter of about 17-42 nm.China has abundant renewable biological resources.Bio-based polyamide(BDI)is based on renewable biological resources.Its development and application can effectively alleviate the pressure of the PA industry.Graphene(GO)and attapulgite(AT)are added to the bio-based polyamide(BDI)to further improve the thermal stability and mechanical properties of the biobased polyamide.Studies have shown that within a certain range,as the addition amount of graphene and attapulgite increases,the elastic modulus and tensile strength of the fiber increase.Polylactic acid is an environmentally friendly and environmentally friendly material that can be recycled indefinitely in nature.Polylactic acid fiber membranes are used as biomedical materials,and the fibrous membranes have small voids and cannot exchange substances with the surrounding environment,and cell proliferation and differentiation are affected.To solve this problem,the pore diameter of the fiber membrane can be enlarged by the degradation of polylactic acid.Cellulose nanocrystals(CNC)are good reinforcing fillers with great application potential.The addition of cellulose nanocrystals improved the degradation rate of the composite membrane based on polylactic acid in the early stage,and improved the thermal stability and mechanical properties of the biomass polymer,and had non-toxic and antibacterial properties.Broadening the application of composite membranes in biomedical stents.