Preparation and properties of carboxylated cellulose nanofibers/monomer casting nylon composites

Abstract

Polyisocyanate was used to chemically functionalize carboxylated cellulose nanofibers (CNF-C). Composites of CNF-C/ monomer casting nylon (MC nylon) and modified CNF-C/MC nylon were fabricated by anionic ring-opening polymerization. The mechanical characteristics of the MC nylon composites and the dispersion of the CNF-C in the MC nylon were studied. The tensile strength and impact strength of composites were first increased with CNF-C addition, but then decreased as further CNF-C was added. The composites had good mechanical properties when CNF-C was added to MC nylon at 1.0 wt%, and the tensile strength and impact strength were increased by 21.2% and 34.9%, respectively, compared to MC nylon. When modified CNF-C was added at 1.5 wt%, the tensile strength of composites was increased by 47.90%. The addition of CNF-C causes an increase in the melting point, crystallinity, and crystallization temperature, which was confirmed by differential scanning calorimetry (DSC). The modified CNF-C had better dispersibility in MC nylon which was confirmed by scanning electron microscopy (SEM).

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Analysis of the Performance of a Gel Actuator Made of Plasticized Polyvinyl Chloride/Carboxylated Cellulose Nanocrystals

“…Surface porosity, material polarity, biocompatibility, nontoxicity, electrical conductivity, and other excellent properties have attracted close attention from researchers. , It was also observed that there is a growing demand for comprehensive research on this material. However, the low solubility of cellulose in weakly polar solvents due to its hydroxyl-rich surface and strong hydrophilic properties has hampered the field of polymeric material compounding, as evidenced by the self-agglomeration and poor solubility of the material in the solvation system. , This defect is a critical reason for limiting its application scope. However, this problem should be considered: researchers found that CNC can be treated with an oxidized surface (increased functional groups), thus improving its solubility and dispersion in the system …”

“…However, the low solubility of cellulose in weakly polar solvents due to its hydroxyl-rich surface and strong hydrophilic properties has hampered the field of polymeric material compounding, as evidenced by the self-agglomeration and poor solubility of the material in the solvation system. 19 , 20 This defect is a critical reason for limiting its application scope. However, this problem should be considered: researchers found that CNC can be treated with an oxidized surface (increased functional groups), thus improving its solubility and dispersion in the system.…”

Dual Cross-Linked Gelatin-Based Adhesive for Leather with Low Curing Temperature and Improved Bonding Strength

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