Natural fibers are used as asubstitute for glass and other synthetic fibers due to the advantages such asits adequate specific properties, low cost and weight, acceptable biodegradability,low density and high aspect ratio for efficient stress transfer 1-3. The mainlimitation of natural fibers used as reinforcement in polymer matrix is thefibers are hydrophilic nature this leads to poor interfacial bonding betweenfibers and matrix 4. The chemical pretreatments reducing the hydrophilicnature of the fibers and also improves the adhesion between fiber and matrix5, 6. Venkateshwaran et.al 7 studied the various concentrations of alkalitreatments on mechanical properties of banana epoxy composites.
The resultsshow that the 1% NaOH treated banana fiber reinforced epoxy compositessuperiorly higher than other treated and untreated fiber composites. Govardhanet.al 8 studied the alkali treatment on mechanical properties of Roystonearegia fiber reinforced epoxy composites and found that the alkali treatment tobe effective improvement in the tensile and flexural properties of thecomposites. Bachtiar et al. 9 performed experiments on alkali treatedsugar palm fibre reinforced epoxy composites and their result showed that thealkali treated fiber composite has higher tensile properties compared tountreated fiber composites. Khanam et al. 10 studied the tensile and flexuralproperties of different fiber weight ratios of randomly oriented unsaturatedpolyester based sisal/carbon fiber reinforced hybrid composites.
The hybridcomposite materials are subject to various chemical resistance tests. Theresult shows that the alkali treatment improves the mechanical properties ofsisal/carbon fiber reinforced hybrid composites. Mylsamy et al. 11 studiedthe mechanical properties of the alkali treated continuous Agave fiberreinforced epoxy composite (TCEC) and untreated continuous Agave fiberreinforced epoxy composite (UTCEC). The result shows that the mechanicalproperties of TCEC have good performance compared to UTCEC. D. Shanmugam et al.
12 evaluated the static and dynamic mechanical properties of alkali treatedcontinuous Palmyra Palm Leaf Stalk Fiber (PPLSF) and jute fibers reinforced hybridpolyester composites. Increasing jute fiber loading showed a considerableincrease in tensile and flexural properties of the hybrid composites as comparedto PPLSF composites. Studies on the behavior of pineapple leaf fibers treatedwith NaOH and modified with two different functionalities were attempted byThreepopnatkul et al 13. From the above literature survey the weight fractionof fibers and matrix are fixed as 30:70 in the composites and fibers weretreated with various concentration of alkali solutions (NaOH) such as 5%, 10%and 15% by weight and the influence of alkali treatments on the static, dynamicmechanical properties and thermal properties of unidirectional continuousmulberry fiber reinforced polyester composites were studied and the results arecompared with other natural fiber composites, respectively.