Preparation and characterization of polypropylene composites reinforced with chemically treated coir

  • Md. Mominul Haque
  • Md. Sakinul Islam
  • Md. Nazrul Islam
Original Paper


In the present work chemically treated coir reinforced polypropylene composites were fabricated by injection molding method. Raw coir was chemically treated by a simple two-step reaction. The mechanical properties of the treated coir reinforced polypropylene (PP) composites were found to be much improved compared to the corresponding values of the untreated ones. Water absorption of the composites increased with an increase in fiber content. However, treated coir-PP composites showed lower water uptake capacity compared to those prepared from untreated coir, indicating that upon chemical treatment the number of hydroxyl groups in the cellulose of coir has decreased, giving reduced the hydrophilic nature of the fiber. The surface morphology of the composites obtained from scanning electron microscopy (SEM) showed that raw coir-PP composites possess microvoids, fiber agglomerates and surface roughness with extruded fiber moieties. However, due to favorable interaction between the treated coir and the PP matrix, agglomerates and micro-voids in the composites have largely minimized showing better dispersion of the fiber in the matrix. It was concluded that upon surface modification hydrophilic nature of coir has largely minimized, giving better fiber-matrix interfacial adhesion and improved mechanical properties of the composites.


Fiber-matrix interface Mechanical properties Injection molding Fiber treatment 



The authors thank the members of the Board of Post-graduate Studies (BPGS) of the Department of Chemistry, BUET for helpful discussion during the groundwork of the project. The financial assistance (CASR-216/23) approved by the Committee for Advanced Studies and Research (CASR), BUET for carrying out the present work is highly appreciated.


  1. 1.
    Premalal HGB, Ismail H, Baharin A (2002) A comparison of the mechanical properties of rice husk powder filled polypropylene composites with talc filled polypropylene composites. Polym Test 21(7):833–839CrossRefGoogle Scholar
  2. 2.
    Yang HS, Kim HJ, Park HJ, Lee BJ, Hwang TS (2007) Effect of compatibilizing agents on rice husk flour reinforced polypropylene composites. Compos Struct 77:45–55CrossRefGoogle Scholar
  3. 3.
    Choi NW, Mori I, Ohama Y (2006) Development of rice husk-plastic composites for building materials. Waste Manage 26(2):189–194CrossRefGoogle Scholar
  4. 4.
    Thwe MM, Liao K (2002) Effects of environmental aging on the mechanical properties of bamboo-glass fiber reinforced polymer matrix hybrid composites. Compos Part A 33:43–52CrossRefGoogle Scholar
  5. 5.
    Zeng Z, Ren W, Xu C, Lu W, Zhang Y, Zhang Y (2010) Maleated natural rubber prepared through mechanochemistry and its coupling effects on natural rubber/cotton fiber composites. J Polym Res 17:213–219CrossRefGoogle Scholar
  6. 6.
    Yang HS, Kim HJ, Son J, Park HJ, Lee BJ, Hwang TS (2004) Rice-husk flour filled polypropylene composites: mechanical and morphological study. Compos Struct 63:305–312CrossRefGoogle Scholar
  7. 7.
    Rana AK, Mandal A, Bandyopadhyay S (2003) Short jute fiber reinforced polypropylene composites: effect of compatibiliser, impact modifier and fiber loading. Compos Sci Technol 63:801–806CrossRefGoogle Scholar
  8. 8.
    Rimdusit S, Wongsongyot S, Jittarom S, Suwanmala P, Tiptipakorn S (2011) Effects of gamma irradiation with and without compatibilizer on the mechanical properties of polypropylene/wood flour composites. J Polym Res 18:801–809CrossRefGoogle Scholar
  9. 9.
    Teramoto N, Urata K, Ozawa K, Shibata M (2008) Biodegradation of aliphatic polyester composites reinforced by abaca fiber. Bioresour Technol 99(5):1474–1480CrossRefGoogle Scholar
  10. 10.
    Karmarkar A, Chauhan SS, Modak JM, Chanda M (2007) Mechanical properties of wood-fiber reinforced polypropylene composites: effect of a novel compatibilizer with isocyanate functional group. Compos Part A 38:227–233CrossRefGoogle Scholar
  11. 11.
    Rout J, Misra M, Tripathy SS, Nayak SK, Mohanty AK (2001) The influence of fiber surface modification on the mechanical properties of coir-polyester composites. Polymer Compos 22:468–476CrossRefGoogle Scholar
  12. 12.
    Ismail H, Edyhan M, Wirjosentono B (2002) Bamboo fiber filled natural rubber composites: the effects of filler loading and bonding agent. Polym Test 21(2):139–144CrossRefGoogle Scholar
  13. 13.
    Pasquini D, Teixeira EM, Curvelo AAAS, Belgacem MN, Dufresne A (2008) Surface esterification of cellulose fiber: processing and Characterization of low-density polyethylene/cellulose fibers composites. Compos Sci Technol 68:193–201CrossRefGoogle Scholar
  14. 14.
    Panthapulakkal S, Sain M (2006) Injection molded wheat straw and corn stem filled polypropylene composites. J Polym Environ 14:265–272CrossRefGoogle Scholar
  15. 15.
    Rowell RM, Tillman AM, Simonson RA (1985) Simplified procedure for the acetylation of hardwood and softwood for flakeboard production. J Wood Chem Tech 6:427–448CrossRefGoogle Scholar
  16. 16.
    Yang HS, Kim HJ, Park HJ, Lee BJ, Hwang TS (2006) Water absorption behavior and mechanical properties of lignocellulosic filler-polyolefin bio-composites. Compos Struct 72:429–437CrossRefGoogle Scholar
  17. 17.
    Rahman MR, Huque MM, Islam MN, Hasan M (2009) Mechanical properties of polypropylene composites reinforced with chemically treated abaca. Compos Part A 40:511–17CrossRefGoogle Scholar
  18. 18.
    Rahman MR, Huque MM, Islam MN, Hasan M (2008) Improvement of physico-mechanical properties of jute fiber reinforced polypropylene composites by post treatment. Compos Part A 39:1739–47CrossRefGoogle Scholar
  19. 19.
    Rahman MR, Huque MM, Islam MN, Hasan M (2009) Physico-mechanical properties of maleic acid post treated jute fiber reinforced polypropylene composites. J Thermoplast Compos Mater 22:365–381CrossRefGoogle Scholar
  20. 20.
    Matuana LM, Balatinecz JJ, Sodhi RNS, Park CBS (2001) Surface characterization of esterified cellulosic fiber by XPS and FTIR spectroscopy. Wood Sci Technol 35:191–201CrossRefGoogle Scholar
  21. 21.
    Khan MA, Bhattacharia SK, Hassan MM, Sultana A (2006) Effect of pretreatment with detergent on mechanical properties of photocured coir (Cocos nucifera) fiber with ethyleneglycol dimethacrylate. J Appl Polym Sci 101:1630–1636CrossRefGoogle Scholar
  22. 22.
    Khan MA, Hassan MM, Taslima R, Mustafa AI (2006) Role of pretreatment with potassium permanganate and urea on mechanical and degradable properties of photocured coir (Cocos nucifera) fiber with 1,6-hexanediol diacrylate. J Appl Polym Sci 100:4361–68CrossRefGoogle Scholar
  23. 23.
    Rout J, Misra M, Tripathy SS, Nayak SK, Mohanty AK (2001) The influence of fiber surface modification on the mechanical properties of coir-polyester composites. Polymer Compos 22:468–476CrossRefGoogle Scholar
  24. 24.
    Shih Y-F, Huang C-C (2011) Polylactic acid (PLA)/banana fiber (BF) biodegradable green composites. J Polym Res 18:2335–2340CrossRefGoogle Scholar
  25. 25.
    Williams DH, Flemming I (1988) Spectroscopic methods in Organic Chemistry, 4th ed. McGraw-Hill, p 52Google Scholar
  26. 26.
    Jamil MS, Ahmed I, Abdullah I (2006) Effects of rice husk filler on the mechanical and thermal properties of liquid natural rubber compatibilized high-density polyethylene/natural rubber blends. J Polym Res 13:315–321CrossRefGoogle Scholar
  27. 27.
    Sanadi AR, Caulfield DF, Jacobson RE, Rowell RM (1995) Renewable agricultural fibers as reinforcing fillers in plastics: mechanical properties of kenaf fiber-polypropylene composites. Ind Eng Chem Res 34:1889–1896CrossRefGoogle Scholar
  28. 28.
    Ismail H, Nizam JM, Khalil HPSA (2001) The effect of a compatibilizer on the mechanical properties and mass swell of white rice husk ash filled natural rubber/linear low density polyethylene blends. Polym Test 20:125–133CrossRefGoogle Scholar
  29. 29.
    Vlaev L, Turmanova S, Dimitrova A (2009) Kinetics and thermodynamics of water adsorption onto rice husks ash filled polypropene composites during soaking. J Polym Res 16:151–164CrossRefGoogle Scholar
  30. 30.
    Liu W, Mohanty AK, Drzal LT, Misra M, Kurian JV, Miller RW, Strickland N (2005) Injection molded glass fiber reinforced poly(trimethylene terephthalate) composites: fabrication and properties evaluation. Ind Eng Chem Res 44:857–862CrossRefGoogle Scholar
  31. 31.
    Huda MS, Drzal LT, Misra M, Mohanty AK, Williams K, Mielewski DF (2005) A study on biocomposites from recycled newspaper fiber and poly(lactic acid). Eng Chem Res 44:5593–5601CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Md. Mominul Haque
    • 1
  • Md. Sakinul Islam
    • 1
  • Md. Nazrul Islam
    • 1
  1. 1.Department of ChemistryBangladesh University of Engineering and TechnologyDhakaBangladesh

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