Mechanical performance of Kraft fibre reinforced polypropylene composites: Influence of fibre length, fibre beating and hygrothermal ageing

Abstract This paper describes the influence of fibre length, fibre beating and hygrothermal ageing on tensile strength (TS), Young’s modulus (YM), failure strain (FS) and impact strength (IS) of Kraft fibre reinforced polypropylene (PP) composites. TS, YM and IS of composites were found to decrease and FS increased with decreasing fibre length. Modest levels of fibre beating increased the TS of composites, which is believed to be due to improved interfacial bonding. During hygrothermal ageing, the diffusion coefficient increased with increased ageing temperature. Composites without coupling agent showed higher water uptake and diffusion coefficient than those with coupling agent. TS and YM were found to decrease for hygrothermal ageing due to fibre damage and reduced fibre matrix interfacial bonding, whilst FS and IS were found to increase due to the plasticizing effect of water.

[1]  A. Grancarić,et al.  Electrokinetic properties of textile fabrics , 2005 .

[2]  L. Matuana,et al.  Effectiveness of Maleated and Acrylic Acid-Functionalized Polyolefin Coupling Agents for HDPE-Wood-Flour Composites , 2003 .

[3]  R. Rowell,et al.  Renewable Agricultural Fibers as Reinforcing Fillers in Plastics: Mechanical Properties of Kenaf Fiber-Polypropylene Composites , 1995 .

[4]  B. Yow,et al.  Hygrothermal aging and tensile behavior of injection‐molded rice husk‐filled polypropylene composites , 2001 .

[5]  J. Clark.  Pulp technology and treatment for paper , 1978 .

[6]  Devrim Balköse,et al.  The effect of fiber surface treatments on the tensile and water sorption properties of polypropylene–luffa fiber composites , 2006 .

[7]  S. Pang,et al.  Dimensional stability and mechanical behaviour of wood–plastic composites based on recycled and virgin high-density polyethylene (HDPE) , 2008 .

[8]  Thelma M. Herrington,et al.  An investigation into the nature of charge on the surface of papermaking woodpulps 1. Charge/pH isotherms , 1992 .

[9]  C. Joly,et al.  Interfaces in polyolefin/cellulosic fiber composites: Chemical coupling, morphology, correlation with adhesion and aging in moisture , 1998 .

[10]  N. Stark.  Influence of Moisture Absorption on Mechanical Properties of Wood Flour-Polypropylene Composites , 2001 .

[11]  C. Baley,et al.  Investigations on the recycling of hemp and sisal fibre reinforced polypropylene composites , 2007 .

[12]  A. Tillman,et al.  A Simplified Procedure for the Acetylation of Hardwood and Softwood Flakes for Flakeboard Production , 1986 .

[13]  John Crank,et al.  The Mathematics Of Diffusion , 1956 .

[14]  R. Coutts.  Autoclaved beaten wood fibre-reinforced cement composites , 1984 .

[15]  K. Oksman,et al.  Novel nanocomposites based on polyurethane and micro fibrillated cellulose , 2008 .

[16]  M. Beg,et al.  Recycling and Its Effects on the Physical and Mechanical Properties of Wood Fibre Reinforced Polypropylene Composites , 2007 .

[17]  J. Balatinecz,et al.  Surface modification and adhesion mechanisms in woodfiber-polypropylene composites , 1999 .

[18]  Mehdi Tajvidi,et al.  Water uptake and mechanical characteristics of natural filler–polypropylene composites , 2003 .

[19]  N. Sombatsompop,et al.  Influence of Type and Concentration of Maleic Anhydride Grafted Polypropylene and Impact Modifiers on Mechanical Properties of PP/Wood Sawdust Composites , 2005 .

[20]  C. Rudd,et al.  Characterisation of random carbon fibre composites from a directed fibre preforming process: The effect of fibre length , 2006 .

[21]  A. Błędzki,et al.  Physico-mechanical studies of wood fiber reinforced composites , 2002 .

[22]  G. Dai,et al.  Effect of hydrothermal environment on moisture absorption and mechanical properties of wood flour–filled polypropylene composites , 2002 .

[23]  J. Modak,et al.  Mechanical properties of wood–fiber reinforced polypropylene composites: Effect of a novel compatibilizer with isocyanate functional group , 2007 .

[24]  I. Mondragon,et al.  Mechanical Behavior of Wood/Polypropylene Composites: Effects of Fibre Treatments and Ageing Processes , 2003 .

[25]  S. M. L. Rosa,et al.  New polymeric-coupling agent for polypropylene/wood-flour composites , 2007 .

[26]  S. Karlsson,et al.  Comparison of water absorption in natural cellulosic fibres from wood and one-year crops in polypropylene composites and its influence on their mechanical properties , 2004 .

[27]  J. P. Lucas,et al.  The effects of a water environment on anomalous absorption behavior in graphite/epoxy composites , 1995 .

[28]  Kin Liao,et al.  Durability of bamboo-glass fiber reinforced polymer matrix hybrid composites , 2003 .

[29]  R. Rowell,et al.  Short jute fiber‐reinforced polypropylene composites: Effect of compatibilizer , 1998 .

[30]  Ignace Verpoest,et al.  Influence of processing and chemical treatment of flax fibres on their composites , 2001 .

[31]  K. Kurtis,et al.  Durability of kraft pulp fiber–cement composites to wet/dry cycling , 2005 .

[32]  N. Bhardwaj,et al.  A comparative study of the effect of refining on physical and electrokinetic properties of various cellulosic fibres. , 2007, Bioresource technology.

[33]  M. Beg,et al.  Fiber Pretreatment and Its Effects on Wood Fiber Reinforced Polypropylene Composites , 2006 .

[34]  Qinglin Wu,et al.  Wood‐fiber/high‐density‐polyethylene composites: Coupling agent performance , 2005 .

[35]  Sabu Thomas,et al.  Environmental effects on the degradation behaviour of sisal fibre reinforced polypropylene composites , 2002 .

[36]  Qinglin Wu,et al.  Chemical Coupling in Wood Fiber and Polymer Composites: A Review of Coupling Agents and Treatments , 2000 .