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Chemistry and Industry of Forest Products ›› 2017, Vol. 37 ›› Issue (5): 119-125.doi: 10.3969/j.issn.0253-2417.2017.05.016

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Properties of Cassava Dregs Fiber/PBS Composites Modified by Starch Ester

YUE Xiaopeng1,2, LIU Pengjie1,2,3, LEI Dan1   

  1. 1. Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper, College of Bioresources Chemicals and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China;
    2. National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, China;
    3. College of Mechanical & Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
  • Received:2017-02-26 Online:2017-10-25 Published:2017-10-30

Abstract: Starch ester(SE) was prepared by using octanoyl chloride as esterification reagent. SE was further used as interfacial modifier in poly(butylene succinate)(PBS)/cassava dregs fiber composites. The contact angle of SE(synthesized by octanoyl chloride, n(-COCl)/n(-OH)=2:1; the degree of substitution(DS) 2.13) was determined to 87.9°, and the hydrophobicity of SE was enhanced as compared to the original starch. The bending, tensile and impact strengths of composites modified with 5% SE were 12.57 MPa, 67.53 MPa and 4.89 kJ/m2, respectively. Compared with those of the specimen without any treatment, the tensile, bending and impact strengths were increased by 52.7%, 24.0% and 30.4%, respectively. Furthermore, the improved compatibility between treated fibers and matrix was verified by SEM images. In addition, the mechanism of starch ester as macromolecule interfacial modifier to enhance the interfacial bonding of composites was speculated. The starch ester was amphiphilic property, one end of which is hydrophobic and PBS matrix was combined with the similar surface activity. One end of the hydrophilic and the hydroxyl groups of cassava dregs fiber were bonded by hydrogen bonds. The starch ester played a bridge role between PBS matrix and cassava dregs fiber, resulting in enhancing the interfacial bonding strength of composites.

Key words: PBS, cassava dregs fiber, composites, starch ester, interfacial modification

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