Influence of Chemical Treatment on Thermal Decomposition and Crystallite Size of Coir Fiber

  • R. Manjula
  • N. V. Raju
  • R. P. S. Chakradhar
  • Ekwipoo Kalkornsurapranee
  • Jobish Johns


Coir fibers were treated with sodium hydroxide (NaOH) and glutaraldehyde (GA). The influence of alkali and aldehyde treatment on thermal degradation and crystallinity of coir fiber was studied in detail. Thermogravimetric analysis and X-ray diffraction techniques were mainly used to characterize the coir samples. Activation energy of degradation was calculated from Broido and Horowitz–Metzger equations. NaOH-treated samples showed an increase in thermal stability. Removal of impurities such as waxy and fatty acid residues from the coir fiber by reacting with strong base solution improved the stability of fiber. Crosslinking of cellulose with GA in the fiber enhanced the stability of the material. Scanning electron microscopy was employed to analyze the change in surface morphology upon chemical treatment. Improvement in the properties suggests that NaOH and GA can be effectively used to modify coir fiber with excellent stability.


Activation energy Coir fiber Crystallinity Glutaraldehyde Thermal stability 



The authors gratefully acknowledge the management of Global Academy of Technology, and Rajarajeswari College of Engineering, Bangalore, for providing the laboratory facilities and their encouragement.


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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • R. Manjula
    • 1
  • N. V. Raju
    • 1
  • R. P. S. Chakradhar
    • 2
  • Ekwipoo Kalkornsurapranee
    • 3
  • Jobish Johns
    • 4
  1. 1.Department of PhysicsGlobal Academy of TechnologyBangalore-98India
  2. 2.Surface Engineering DivisionCSIR-NALBangalore -17India
  3. 3.Department of Materials Science and Technology, Faculty of SciencePrince of Songkla UniversityHat-YaiThailand
  4. 4.Department of PhysicsRajarajeswari College of EngineeringBangalore-74India

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