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  • 1
    Electronic Resource
    Electronic Resource
    The Effects of Residual Lignin Content on Wood Fibre Reinforced Polypropylene Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 323-326 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study investigates the effect weathering on composites made from fibre subjected tovarious stages of a standard Kraft pulping process. Pre-washed, washed and bleached Kraft woodfibre of kappa numbers 27, 17, and 1 was assessed in terms of its surface potential using thestreaming potential method and combined with polypropylene (PP) to produce composites.Composites were prepared using a twin screw extruder followed by pelletising and injectionmoulding. Tensile testing, hardness testing and impact testing were carried out to evaluate thecomposite mechanical properties. It was found that fibre with higher amounts of residual lignincontent led to composites with lower tensile and impact strengths and increased degradability whensubjected to accelerated weathering testing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.323.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of Alkali Treatment on the Interfacial Bond Strength of Industrial Hemp Fibre Reinforced Epoxy Composites: Effect of Variation from the Ideal Stoicheometric Ratio of Epoxy Resin to Curing Agent (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 319-322 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Industrial hemp fibre was treated with alkali and the influence of this treatment oninterfacial shear strength (assessed using the single fibre pull-out test) and composite strength withan epoxy resin, over a range of epoxy resin to curing agent ratios, was investigated. Scanningelectron microscopy was conducted to assess the fracture behaviour of the composite tensile testspecimens. It was found that alkali treatment increased the interfacial shear strength and compositetensile strength, Young’s modulus and elongation at break. The highest tensile strength wasobtained with an epoxy resin to curing agent ratio of 1:1 while the best Young’s modulus wasachieved with a resin to curing agent ratio of 1:1.2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.319.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fungal and Alkali Interfacial Modification of Hemp Fibre Reinforced Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 493-496 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The aim of the current work was to investigate using fungi to treat hemp fibre to createbetter bonding characteristics in natural fibre reinforced polypropylene composites. X-ray diffraction(XRD), lignin testing and scanning electron microscopy (SEM), were used to characterise the effectof treatment on hemp fibres. A combined alkali and fungal treated fibre composite produced thehighest tensile strength of 48.3 MPa, an increase of 32% compared to composites with untreated fibre
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.493.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Recycling and Its Effects on the Physical and Mechanical Properties of Wood Fibre Reinforced Polypropylene Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 497-500 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study investigates the effect of recycling/reprocessing on the physical andmechanical properties of composites based on radiata pine (Pinus Radiata) fibre and polypropylene(PP) with a maleated polypropylene (MAPP) coupling agent, produced using a twin-screw extruder,followed by injection moulding. Composites containing 40wt% fibre and 4wt% MAPP wereassessed mechanically and thermally, as well as for moisture absorption after being recycled up toeight times. Both the tensile strength (TS) and Young’s modulus (YM) of composites were found todecrease linearly from 41 MPa and 4556 MPa respectively to 31 MPa and 3800 MPa for compositesrecycled eight times. However, the elongation at break was found to increase with increasedrecycling due to fibre damage that occurred during reprocessing and the associated reduction ofaverage fibre length, found to decrease from 2.36mm to 0.37mm after recycling eight times.Thermal stability and moisture resistance of composites improved with recycling due to theimprovement of interfacial bonding between fibre and matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.497.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluation of the Mechanical Properties of Injection Moulded Hemp Fibre Reinforced Polypropylene Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 303-306 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In recent years, industrial hemp fibre reinforced thermoplastic composites have attractedsubstantial interest as potential structural materials. These composites have been subject to intensestudy for use in lightweight, recyclable and low cost applications. The aim of this research was toimprove and evaluate the composite tensile strength and fibre/matrix interfacial adhesion by meansof fibre treatment and addition of a coupling agent. Hemp fibre was digested in a small pressurevessel with a solution of 5wt% NaOH / 2wt% Na2SO3. Single fibre tensile tests were performed ontreated and untreated fibres, and it was found that the alkali treatment resulted in an increase in fibrestrength and an improvement in fibre separation. Composites containing either treated or untreatedfibre, polypropylene and a maleic anhydride modified polypropylene (MAPP) coupling agent werethen compounded in a twin-screw extruder and injection moulded into tensile test specimens.Tensile tests revealed that significant improvements in composite strength were made by usingtreated fibre and MAPP. The effect of MAPP on the interface of treated hemp fibre/polypropylenecomposites was assessed by means of the single fibre fragmentation test, and the interfacial shearstrength was determined thereafter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.303.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The Use of Aqueous Urea as Chemical Denaturant in Processing CGM into a Biodegradable Polymer Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 181-184 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Corn gluten meal (CGM) has potential as a bioderived polymer for use in compositematerials. Previous work to improve the processability of CGM has focused on the use ofplasticisers including water, polyethylene glycol, glycerol and octanoic acid, however, a commonproblem is that these leach from the material subsequent to processing [1]. It has been raised that acertain degree of denaturation must occur in order to make proteins processable [2]. The currentwork explores the use of aqueous urea as chemical denaturant in processing CGM into abiodegradable polymer material. Consolidated materials were obtained which showed increasedresistance to cracking with higher urea concentration. FTIR analysis revealed that processing CGMwith increased concentrations of aqueous urea resulted in the progressive transformation of theprotein secondary structure from an ordered, clustered conformation to that of extended chains.Aqueous urea is assumed to promote protein-solvent interactions which stabilise the extended chainconformations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.181.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Hemp Fibre Reinforced Poly(Lactic Acid) Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 337-340 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The potential of hemp fibre as a reinforcing material for Poly(lactic acid) (PLA) wasinvestigated. Good interaction between hemp fibre and PLA resulted in increases of 100% forYoung’s modulus and 30% for tensile strength of composites containing 30 wt% fibre. Differentpredictive ‘rule of mixtures’ models (e.g. Parallel, Series and Hirsch) were assessed regarding thedependence of tensile properties on fibre loading. Limited agreement with models was observed.Differential scanning calorimetry (DSC) and x-ray diffraction (XRD) studies showed that hempfibre increased the degree of crystallinity in PLA composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.337.pdf
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