Cellulose nanofibers and method for producing same, composite resin composition, molded body

Abstract

Cellulose nanofibers have an average degree of polymerization of 600 or more to 30000 or less, an aspect ratio of 20 or more to 10000 or less, an average diameter of 1 nm or more to 800 nm or less, and an Iβ-type crystal peak in an X-ray diffraction pattern, in which a hydroxyl group is chemically modified by a modifying group.

1 . Cellulose nanofibers, having an average degree of polymerization of 600 or more to 30000 or less, an aspect ratio of 20 or more to 10000 or less, an average diameter of 1 nm or more to 800 nm or less, and an Iβ-type crystal peak in an X-ray diffraction pattern, wherein a hydroxyl group is chemically modified by a modifying group. 
     
     
         2 . The cellulose nanofibers according to  claim 1 , wherein a thermal decomposition temperature of the cellulose nanofibers is equal to or more than 330° C. 
     
     
         3 . The cellulose nanofibers according to  claim 2 , wherein a saturated absorptivity of the cellulose nanofibers in an organic solvent having an SP value of 8 or more to 13 or less is 300% or more to 5000% or less by mass. 
     
     
         4 . The cellulose nanofibers according to  claim 3 , wherein the organic solvent is a water-insoluble solvent. 
     
     
         5 . The cellulose nanofibers according to  claim 1 , wherein the hydroxyl group of the cellulose nanofibers is esterified or etherified by the modifying group. 
     
     
         6 . The cellulose nanofibers according to  claim 1 , wherein a modification rate of the cellulose nanofibers is 0.01% or more to 50% or less based on all of the hydroxyl groups. 
     
     
         7 . A composite resin composition, comprising the cellulose nanofibers according to  claim 1  in a resin. 
     
     
         8 . A composite resin composition, comprising the cellulose nanofibers according to  claim 3  in a resin. 
     
     
         9 . A molded body which is formed by molding the composite resin composition according to  claim 8 . 
     
     
         10 . A method for producing cellulose nanofibers, comprising a process of: swelling a cellulose raw material in a solution containing an ionic liquid; and adding a modifier thereto, filtering, and washing the cellulose raw material. 
     
     
         11 . The cellulose nanofibers according to  claim 1 , wherein a saturated absorptivity of the cellulose nanofibers in an organic solvent having an SP value of 8 or more to 13 or less is 300% or more to 5000% or less by mass.