2024 Volume 60 Issue 3 Pages 68-74
The various composites of hydrophobized cellulose nanofiber（CNF）/thermoplastic polyurethane elastomer（TPU）were prepared, using polyoxytetramethylene glycol（PTMG）containing a small amount of CNF as the soft component, 4,4’-diphenylmethane diisocyanate（MDI）as a diisocyanate and 1,4-butanediol（BD）as a chain extender. The molar ratio of PTMG/MDI/BD was 1/2/1, the preparation of composites were carried out by one-shot method and prepolymer method in bulk polymerization, respectively. As a result of evaluating the tensile physical properties and higher-order structure of the obtained composites, it was found that the tensile strength increased significantly in all CNF-added composites, and the more advanced micro phase separation structure was observed in the composites prepared by oneshot method. In addition, we also found that the reaction between the hydroxyl groups remaining in the hydrophobized CNF and the isocyanate groups has a major influence on this factor.
