The effects of alkali treatment on the mechanical properties, void contents and morphological of Pennisetum purpureum/glass-reinforced epoxy hybrid composites were studied. The composites were produced using the vacuum infusion method. Pennisetum purpureum fibres were treated with 5 and 10% dilute sodium hydroxide (NaOH) solution for 6 h. The epoxy resin was mixed with either the treated or untreated Pennisetum purpureum/glass fibres to a ratio of 70:30 (by volume). Tensile and flexural tests were performed on the composites in accordance with ASTM D638 and ASTM D790, respectively. The hybrid composites that contained 5% NaOH-treated Pennisetum purpureum fibres exhibited the greatest tensile and flexural strengths with lower void contents. Field-emission scanning electron microscopy fractography supported the findings showing lesser voids and fibre pull-outs suggesting good interfacial bonding between the matrix and reinforcement. The reduced of the void contents is suspected due to the reduced hemicellulose content within the treated Pennisetum purpureum fibre.
AlzeerM, MacKenzieK.Synthesis and mechanical properties of novel composites of inorganic polymers (geopolymers) with unidirectional natural flax fibres (Phormium tenax). Appl Clay Sci. 2013;75–76:148–152. DOI:10.1016/j.clay.2013.03.010
2.
MohantyAK, WibowoA, MisraM, Effect of process engineering on the performance of natural fiber reinforced cellulose acetate biocomposites. Compos A. 2004;35:363–370. DOI:10.1016/j.compositesa.2003.09.015
3.
ThakurVK, ThakurMK, GuptaRK.Synthesis of lignocellulosic polymer with improved chemical resistance through free radical polymerization. Int J Biol Macromol. 2013;61:121–126. DOI:10.1016/j.ijbiomac.2013.06.045
4.
LiuK, YangZ, TakagiH.Anisotropic thermal conductivity of unidirectional natural abaca fiber composites as a function of lumen and cell wall structure. Compos Struct. 2014;108:987–991. DOI:10.1016/j.compstruct.2013.10.036
5.
WambuaP, IvensJ, VerpoestI.Natural fibres: can they replace glass in fibre reinforced plastics?Compos Sci Technol. 2003;63:1259–1264. DOI:10.1016/S0266-3538(03)00096-4
6.
AlamriH, LowIM, AlothmanZ.Mechanical, thermal and microstructural characteristics of cellulose fibre reinforced epoxy/organoclay nanocomposites. Compos B. 2012;43:2762–2771. DOI:10.1016/j.compositesb.2012.04.037
7.
Murali Mohan RaoK, Mohana RaoK, Ratna PrasadAV.Fabrication and testing of natural fibre composites: vakka, sisal, bamboo and banana. Mater Des. 2010;31:508–513. DOI:10.1016/j.matdes.2009.06.023
8.
WangF, ShaoJ, KeerLM, The effect of elementary fibre variability on bamboo fibre strength. Mater Des. 2015;75:136–142. DOI:10.1016/j.matdes.2015.03.019
9.
EssabirH, BensalahMO, RodrigueD, Structural, mechanical and thermal properties of bio-based hybrid composites from waste coir residues: fibers and shell particles. Mech Mater. 2016;93:134–144. DOI:10.1016/j.mechmat.2015.10.018
10.
EssabirH, BoujmalR, BensalahMO, Mechanical and thermal properties of hybrid composites: oil-palm fiber/clay reinforced high density polyethylene. Mech Mater. 2016;98:36–43. DOI:10.1016/j.mechmat.2016.04.008
11.
WangF, LiX, ZhangJ, Micromechanical modelling of the progressive failure in unidirectional composites reinforced with bamboo fibres. Mech Mater. 2016;94:180–192. DOI:10.1016/j.mechmat.2015.12.006
12.
KuH, WangH, PattarachaiyakoopN, A review on the tensile properties of natural fiber reinforced polymer composites. Compos B. 2011;42:856–873. DOI:10.1016/j.compositesb.2011.01.010
13.
AzwaZN, YousifBF, ManaloAC, A review on the degradability of polymeric composites based on natural fibres. Mater Des. 2013;47:424–442. DOI:10.1016/j.matdes.2012.11.025
14.
BakarNH, HyieKM, RamlanAS, Mechanical properties of Kevlar reinforcement in Kenaf composites. Appl Mech Mater. 2013;465–466:847–851. doi: 10.4028/www.scientific.net/AMM.465-466.847
Noorunnisa KhanamP, Abdul KhalilHPS, JawaidM, Sisal/carbon fibre reinforced hybrid composites: tensile, flexural and chemical resistance properties. J Polym Environ. 2010;18:727–733. doi: 10.1007/s10924-010-0210-3
17.
Azrin HaniAR, RoslanA, JaafarM, Mechanical properties evaluation of woven coir and kevlar reinforced epoxy composites. Adv Mater Res. 2011;277:36–42. doi: 10.4028/www.scientific.net/AMR.277.36
18.
IndranS, RajRE, SreenivasanVS.Characterization of new natural cellulosic fiber from Cissus quadrangularis root. Carbohydr Polym. 2014;110:423–429. DOI:10.1016/j.carbpol.2014.04.051
19.
Obi ReddyK, Uma MaheswariC, ShuklaM, Tensile and structural characterization of alkali treated Borassus fruit fine fibers. Compos B. 2013;44:433–438. DOI:10.1016/j.compositesb.2012.04.075
20.
ThakurMK, GuptaRK, ThakurVK.Surface modification of cellulose using silane coupling agent. Carbohydr Polym. 2014;111:849–855. DOI:10.1016/j.carbpol.2014.05.041
21.
GirishaC, SrinivasGR.Sisal/coconut coir natural fibers–epoxy composites: water absorption and mechanical properties. Int J Eng Innov Technol. 2012;2:166–170.
LiX, TabilL, PanigrahiS.Chemical treatments of natural fiber for Use in natural fiber-reinforced composites: a review. J Polym Environ. 2007;15:25–33. DOI:10.1007/s10924-006-0042-3
24.
BledzkiAK, GassanJ.Composites reinforced with cellulose based fibres. Prog Polym Sci. 1999;24:221–274. DOI:10.1016/S0079-6700(98)00018-5
RidzuanMJM, Abdul MajidMS, AfendiM, Characterisation of natural cellulosic fibre from Pennisetum purpureum stem as potential reinforcement of polymer composites. Mater Des. 2016;89:839–847. DOI:10.1016/j.matdes.2015.10.052
27.
RidzuanMJM, Abdul MajidMS, AfendiM, The effects of the alkaline treatment's soaking exposure on the tensile strength of napier fibre. Proc Manuf. 2015;2:353–358. DOI:10.1016/j.promfg.2015.07.062
28.
RidzuanMJM, Abdul MajidMS, AfendiM, Effects of alkaline concentrations on the tensile properties of napier grass fibre. Appl Mech Mater. 2015;786:23–27. DOI:10.4028/www.scientific.net/AMM.786.23
29.
ReddyKO, MaheswariCU, ShuklaM, Chemical composition and structural characterization of Napier grass fibers. Mater Lett. 2012;67:35–38. DOI:10.1016/j.matlet.2011.09.027
30.
AtiqahA, MalequeMA, JawaidM, Development of kenaf-glass reinforced unsaturated polyester hybrid composite for structural applications. Compos B. 2014;56:68–73. DOI:10.1016/j.compositesb.2013.08.019
31.
RahmanianS, SurayaAR, ShazedMA, Mechanical characterization of epoxy composite with multiscale reinforcements: carbon nanotubes and short carbon fibers. Mater Des. 2014;60:34–40. DOI:10.1016/j.matdes.2014.03.039
32.
KanchireddyOR, MuzendaE.Effect of fiber surface treatments on the tensile properties of polycarbonate-coated napier grass fibers. 2nd International Conference on Research in Science, Engineering and Technology; 2014. p. 194–197.
33.
ManaloAC, WaniE, ZukarnainNA, Effects of alkali treatment and elevated temperature on the mechanical properties of bamboo fibre–polyester composites. Compos B. 2015;80:73–83. DOI:10.1016/j.compositesb.2015.05.033
34.
ReddyKO, MaheswariCU, ReddyDJP, Thermal properties of Napier grass fibers. Mater Lett. 2009;63:2390–2392. DOI:10.1016/j.matlet.2009.08.035
35.
PetrucciR, SantulliC, PugliaD, Mechanical characterisation of hybrid composite laminates based on basalt fibres in combination with flax, hemp and glass fibres manufactured by vacuum infusion. Compos B. 2015;69:507–515. DOI:10.1016/j.compositesb.2014.10.031
36.
XiaC, ShiSQ, CaiL.Vacuum-assisted resin infusion (VARI) and hot pressing for CaCO3 nanoparticle treated kenaf fiber reinforced composites. Compos B. 2015;78:138–143. DOI:10.1016/j.compositesb.2015.03.039
37.
JúniorJHSA, JúniorHLO, AmicoSC, Study of hybrid intralaminate curaua/glass composites. Mater Des. 2012;42:111–117. DOI:10.1016/j.matdes.2012.05.044
38.
RidzuanMJM, Abdul MajidMS, AfendiM, Moisture absorption and mechanical degradation of hybrid Pennisetum purpureum/glass–epoxy composites. Compos Struct. 2016;141:110–116. DOI:10.1016/j.compstruct.2016.01.030
39.
SathishkumarTP, NavaneethakrishnanP, ShankarS.Tensile and flexural properties of snake grass natural fiber reinforced isophthallic polyester composites. Compos Sci Technol. 2012;72:1183–1190. DOI:10.1016/j.compscitech.2012.04.001
40.
KwonH-J, SunthornvarabhasJ, ParkJ-W, Tensile properties of kenaf fiber and corn husk flour reinforced poly(lactic acid) hybrid bio-composites: role of aspect ratio of natural fibers. Compos B. 2014;56:232–237. DOI:10.1016/j.compositesb.2013.08.003
41.
AnuarH, ZuraidaA.Improvement in mechanical properties of reinforced thermoplastic elastomer composite with kenaf bast fibre. Compos B. 2011;42:462–465. DOI:10.1016/j.compositesb.2010.12.013
42.
ASTMD638. Standard test method for tensile properties of plastics. ASTM Int.2010;1–16. DOI:10.1520/D0638-10.1
43.
OchiS.Mechanical properties of kenaf fibers and kenaf/PLA composites. Mech Mater. 2008;40:446–452. DOI:10.1016/j.mechmat.2007.10.006
44.
ASTM D790. Standard test methods for flexural properties of unreinforced and reinforced plastics and electrical insulating materials. Annu B ASTM Std. 2011;1–11. DOI: 10.1520/D0790-10
45.
HamaeemMJA, Abdul MajidMS, AfendiM, Mechanical properties of Napier grass fibre/polyester composites. Compos Struct. 2016;136:1–10. DOI:10.1016/j.compstruct.2015.09.051
46.
El-AbbassiFE, AssararM, AyadR, Effect of alkali treatment on alfa fibre as reinforcement for polypropylene based eco-composites: mechanical behaviour and water ageing. Compos Struct. 2015;133:451–457. DOI:10.1016/j.compstruct.2015.07.112
47.
MishraS, MohantyAK, DrzalLT, Studies on mechanical performance of biofibre/glass reinforced polyester hybrid composites. Compos Sci Technol. 2003;63:1377–1385. DOI:10.1016/S0266-3538(03)00084-8
48.
WongKJ, YousifBF, LowKO.The effects of alkali treatment on the interfacial adhesion of bamboo fibres. Proc Inst Mech Eng L J Mater Des Appl. 2010;224:139–148. DOI:10.1243/14644207JMDA304
49.
MwaikamboLY, TuckerN, ClarkAJ.Mechanical properties of hemp-fibre-reinforced euphorbia composites. Macromol Mater Eng. 2007;292:993–1000. DOI:10.1002/mame.200700092
50.
GurunathanT, MohantyS, NayakSK.A review of the recent developments in biocomposites based on natural fibres and their application perspectives. Compos A Appl Sci Manuf. 2015;77:1–25. DOI:10.1016/j.compositesa.2015.06.007
