Blog List

Wednesday 19 October 2016

Processing and characterization of coconut shell powder filled UHMWPE

Published Date
doi:10.1016/j.msea.2003.09.065 

  • Author 
  • Siddhartha K. Pradhan a,,
  • E.S. Dwarakadasa b
  • Philip J. Reucroft a

  • aDepartment of Chemical and Materials Engineering, University of Kentucky, 177 Anderson Hall, Lexington, KY 40506, USA
    bDepartment of Metallurgy, Indian Institute of Science, Bangalore 560012, India

    Received 20 June 2003. Revised 8 September 2003. Available online 20 November 2003. 

    Abstract 

    A novel polymer matrix composite using coconut shell powder (CSP) as a filler material has been processed by a powder metallurgy technique. A mixture of ultrahigh molecular weight polyethylene (UHMWPE) powder and CSP was compacted at 200 °C in a die-punch arrangement. The composite material remained tough when the CSP content was 20–30 vol.%, as revealed by notch impact tests and fractography studies. However, the compressive strength of the UHMWPE–CSP composite decreased rapidly beyond 20 vol.% CSP. In this paper, preliminary results are presented to throw light on mechanical properties and on some aspects of the processing method used.

    Keywords

  • UHMWPE
  • Filled polymer composite
  • Coconut shell powder

  • Fig. 1.
    Fig. 2.
    Fig. 3.
    Fig. 4.
    Fig. 5.
    Fig. 6.
    Fig. 7.
    • Corresponding author. Tel.: +1-859-420-5211; fax: +1-859-323-1929.
    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S0039914015001678

    Multivariate analysis of coconut residues by near infrared spectroscopy

    Published Date
    1 June 2015, Vol.138:263272, doi:10.1016/j.talanta.2015.03.014

    Author  
  • M.K.D. Rambo a,b
  • A.R. Alves c
  • W.T. Garcia c
  • M.M.C. Ferreira a,,

  • aInstitute of Chemistry, University of Campinas – UNICAMP, CEP 13083-970 Campinas, Brazil
    bDepartment of Chemistry, University of Tocantins – UFT, CEP 77838-824 AraguaĆ­na, Brazil
    cSugarcane Research Center – CTC, CEP 13418-900 Piracicaba, Brazil

    Received 2 December 2014. Revised 6 March 2015. Accepted 7 March 2015. Available online 12 March 2015. 

    Highlights
    • Characterization of coconut residues.
    • Physicochemical analysis of several processing stages.
    • Potential use of NIRS and chemometrics for determining biomass composition.
    • Biorefineries opportunities.
    Abstract 

    Near infrared (NIR) spectroscopy was used to determine the content of Klason lignin, acid-soluble lignin, total lignin, extractives, ash, acid-insoluble residue, glucose, xylose, rhamnose, galactose, arabinose, mannose and total sugars in coconut residues. The samples were analyzed at several processing stages: wet unground (WU), dried unground (DU) and dried and sieved (DS). Partial least squares models were built, and the models for the analytes exhibited R2>0.80, with the exceptions of rhamnose, arabinose, galactose, mannose and ash from all fractions, and the lignin content from the WU fraction, which were predicted poorly (R2<0.70). There were some significant differences between the models for the main lignocellulosic components at the various stages of biomass. These results proved that NIR spectroscopy is useful for analysis at biorefineries, and it can be used as a faster and more economical alternative to the standard methods.

    Graphical abstract

    Near Infrared Spectra for coconut samples and plot of reference versus predicted values from the calibration and external validation models for the total sugars.

     Table 1
    Table 1.
    Fig. 1.
     Table 2
    Table 2.
     Table 3
    Table 3.
    Fig. 2.
    Fig. 3.
    Fig. 4.
     Table 4
    Table 4.
    Fig. 5.
    Fig. 6.
     Table 5
    Table 5.
    • ⁎ 
      Corresponding author.

    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S0925838810027672

    Potential of using coconut shell particle fillers in eco-composite materials

    Published Date
    3 February 2011, Vol.509(5):23812385, doi:10.1016/j.jallcom.2010.11.025

    Author 
  • J. Sarki a,b,
  • S.B. Hassan a,b,
  • V.S. Aigbodion a,b,,
  • J.E. Oghenevweta a,b

  • aDepartment of Fire and Safety, Kaduna International Airport, Kaduna-State, Nigeria
    bDepartment of Metallurgical and Materials Engineering, Ahmadu Bello University, Samaru, Zaria, Nigeria

    Received 6 October 2010. Revised 30 October 2010. Accepted 3 November 2010. Available online 10 November 2010. 

    Abstract

    Morphology and mechanical properties of coconut shell particles reinforced epoxy composites were evaluated to assess the possibility of using it as a new material in engineering applications. Coconut shell filled composites were prepared from epoxy polymer matrix containing up to 30 wt% coconut shell fillers. The effects of coconut shell particle content on the mechanical properties of the composites were investigated. Scanning electron microscopy (SEM) of the composite surfaces indicates that there are fairly good interfacial interaction between coconut shell particles and epoxy matrix. It was shown that the value of tensile modulus and tensile strength values increases with the increase of coconut shell particles content, while the impact strength slightly decreased, compared to pure epoxy resin. This work has shown that coconut shell particles can be used to improve properties of epoxy polymer composite to be used in eco-buildings.

    Research highlights

    ▶ The production and characterization of the composites has been done.

    Keywords

  • Coconut shell
  • Composites
  • Epoxy
  • Morphology and mechanical properties

  • Fig. 1.
    Fig. 2.
    Fig. 3.
    Fig. 4.
    Fig. 5.
    Fig. 6.
    Fig. 7.
    Fig. 8.
    Fig. 9.
    Fig. 10.
     Table 1
    Table 1.
    • ⁎ 
      Corresponding author at: Department of Metallurgical and Materials Engineering, Ahmadu Bello University, Samaru, Zaria, Nigeria. Tel.: +234 8028433576.

    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S1359431115010261

    Synthesis of coconut shell nanoparticles via a top down approach: Assessment of milling duration on the particle sizes and morphologies of coconut shell nanoparticles

    Published Date
    15 November 2015, Vol.159:514519, doi:10.1016/j.matlet.2015.07.063
    Featured Letter

    Author 
    • Sefiu Adekunle Bello a,b,,,
    • Johnson Olumuyiwa Agunsoye a
    • Suleiman Bolaji Hassan a
    • aDepartment of Metallurgical and Materials Engineering, Faculty of Engineering, University of Lagos, Lagos, Nigeria
    • bDepartment of Materials Science and Engineering, Kwara State University, Malete, Nigeria

    Fig. 1.
    Fig. 2.
    Fig. 3.
    Fig. 4.
    • ⁎ 
      Corresponding author at: Kwara State University, Materials Science and Engineering, Malete, Kwara State, Nigeria.

    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S1359431115010261

    Advantages and Disadvantages of Fasting for Runners

    Author BY   ANDREA CESPEDES  Food is fuel, especially for serious runners who need a lot of energy. It may seem counterintuiti...