Effect of high temperature degumming of cotton stalk bark fiber on its composition and structure

The technique of high temperature degumming of cotton stalk bark fiber was studied,and the effect of concentration of NaOH on the composition and structure of cotton stalk bark fiber was discussed.Scanning electron microscope(SEM),Fourier-Transform-Infrared(FT-IR) and X-ray difffraction(XRD) were used to characterize the morphology and structure of aggregating state of cotton stalk bark fiber before and after high temperature degumming.The measurement on the remnant alkali of the black liquid indicated whether the reaction was sufficient.Meanwhile,the strength at break and thermal property of the degummed fibers were also tested.The better degumming parameters were obtained.The results demonstrated that the contents of hemicellulose and lignin of the cotton stalk bark fiber reduced obviously after high temperature degumming,and the contents of cellulose increased to nearly 93%.The strength at break and thermal property of the treated cotton stalk bark fiber were related to the concentration of alkali.