Water Absorption Properties of Kenaf/Glass Reinforced Unsaturated Polyester Composites used in Insulator Rods

Kenaf fibres have acquired enormous attention in recent years, owing to their economic viability and environmental acceptability. Kenaf (natural) fibres have been started to replace the glass fibre (synthetic) in mechanical, electrical applications and have been utilized in several applications of industrial engineering. The current study deals with water absorption of kenaf/glass fibre reinforced unsaturated polyester composite materials used in high voltage polymeric insulator rods. The kenaf/glass hybrid composites were based on 20%, 30% and 40%(by volume) of kenaf fibers replacement glass fibres with modified 60 vol.% unsaturated polyester resins. The composites were immersedin distilled water at room temperature, and composites resistance to water absorption in terms of the rate of water absorption was determined.A considerable difference in the properties of water absorption of the hybrid composite was found demonstrating that the water absorption effect on the characteristics of insulator rods depends on the arrangement and volume fraction of kenaf fibre of the composite used. Based on the results obtained, a slight effect of water absorption on pure glass fibre composite (control) was observed. The addition of kenaf fibre on glass fibre composite rod increased the water absorption of the composite. It was shown that glass fibres surrounding kena ffibre reduced water absorption. Despite the fact that 40 vol.% of kenaf fibre composite had the highest natural fibre content, it showed the lowest water absorption because of its arrangement on all composite diameters, and also because of being surrounded by glass fibres. All of the materials reached equilibrium and ceased to absorb water after 300 hours

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Effect of Water Absorption on Flexural Properties of Kenaf/Glass Fibres Reinforced Unsaturated Polyester Hybrid Composites Rod

Pertanika Journal of Science and Technology ◽

10.47836/pjst.30.1.22 ◽

2022 ◽

Vol 30 (1) ◽

pp. 397-412

Author(s):

Bassam Hamid Alaseel ◽

Mohamed Ansari Mohamed Nainar ◽

Noor Afeefah Nordin ◽

Zainudin Yahya ◽

Mohd Nazim Abdul Rahim

Keyword(s):

Flexural Strength ◽

Water Absorption ◽

Glass Fibre ◽

Volume Fraction ◽

Hybrid Composites ◽

Unsaturated Polyester ◽

Flexural Properties ◽

Effect Of Water ◽

Kenaf Fibre ◽

Kenaf Fibres

This study investigates the effect of water absorption on the flexural strength of kenaf/ glass/unsaturated polyester (UPE) hybrid composite solid round rods used for insulating material applications. Three volume fractions of kenaf/glass fibre 20:80 (KGPE20), 30:70 (KGPE30), and 40:60 (KGPE40) with three different fibre arrangement profiles of kenaf fibres were fabricated by using the pultrusion technique and were aimed at studying the effect of kenaf fibres arrangement profile and its content in hybrid composites. The fibre/ resin volume fraction was maintained constant at 60:40. The dispersion morphologies of tested specimens were observed using the scanning electron microscope (SEM). The findings were compared with pure glass fibre-reinforced UPE (control) composite. The water absorption results showed a clear indication of how it influenced the flexural strength of the hybrid and non-hybrid composites. The least affected sample was observed in the 30KGPE composite type, wherein the kenaf fibre was concentrated at the centre of a cross-section of the composite rod. The water absorption reduced the flexural strength by 7%, 40%, 24%, and 38% of glass/UPE (control), 20KGPE, 30KGPE, and 40KGPE composites, respectively. In randomly distributed composite types, the water absorption is directly proportional to the volume fraction of kenaf fibre. At the same time, flexural properties were inversely proportional to the volume fraction of kenaf fibres. Although the influence of water absorption on flexural strength is low, the flexural strength of pultruded hybrid composites was more influenced by the arrangement of kenaf fibre in each composite type than its fibre loading.

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Mechanical and Water Absorption Properties of Hybrid Kenaf/Glass Fibre Mat Reinforced Unsaturated Polyester Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.888.228 ◽

2017 ◽

Vol 888 ◽

pp. 228-233 ◽

Cited By ~ 3

Author(s):

Nurshairatun Amira Rozali ◽

Mohamad Bashree Abu Bakar ◽

Mohamad Najmi Masri ◽

Muhammad Azwadi Sulaiman ◽

Mazlan Mohamed ◽

...

Keyword(s):

Water Absorption ◽

Glass Fibre ◽

Room Temperature ◽

Hybrid Composites ◽

Unsaturated Polyester ◽

Morphological Properties ◽

Flexural Test ◽

Thickness Swelling ◽

Absorption Properties ◽

Kenaf Fibre

Hybrid kenaf/glass fibre mat reinforced unsaturated polyester (UPE) composites have been prepared by using simple hand lay up moulding technique. The composites with various formulations were characterized by flexural test while water absorption behaviour were investigated with immersion in distilled water at room temperature. The result shows that the hybrid composites with kenaf fibre mat at the innermost layers (glass fibre mat at the outer layers) has given the highest flexural strength and modulus. On the other hand, water absorption study shows that, the hybrid composites with glass fibre mat at the innermost layers (kenaf fibre mat at the outer layers) showed the highest water uptake and thickness swelling. Further investigations on morphological properties were also done to correlate the mechanical properties of the hybrid kenaf/glass fibre mat reinforced UPE composites.

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Effect of Water Absorption Behaviour on Tensile Properties of Hybrid Jute-Roselle Woven Fibre Reinforced Polyester Composites

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.18.4.2021.02.0705 ◽

2021 ◽

Vol 18 (4) ◽

Author(s):

Agung Efriyo Hadi ◽

Tezara Cionita ◽

Deni Fajar Fitriyana ◽

Januar Parlaungan Siregar ◽

Ahmed Nurye Oumer ◽

...

Keyword(s):

Tensile Strength ◽

Water Absorption ◽

Fibre Composite ◽

Unsaturated Polyester ◽

Water Immersion ◽

Tensile Modulus ◽

Natural Fibre ◽

Jute Fibre ◽

Thickness Swelling ◽

Effect Of Water

Incorporating natural fibre as reinforcement in the polymer matrix has shown a negative effect since the natural fibre is hydrophilic. The natural fibre easily absorbs water which causes an effect on the mechanical properties of the composites. The objective of this paper is to investigate the water absorption behaviour of hybrid jute-roselle woven fibre reinforced unsaturated polyester composite and the effect of water absorption in terms of tensile strength and tensile modulus. The effect of hybrid composite on the thickness swelling will be tested. The fabrication method used in this study is the hand lay-up technique to fabricate 2-layer and 3-layer composites with layering sequences of woven jute (J)/roselle (Ro) fibre. The results of the study showed that pure roselle fibres for 2 and 3-layer composites have the highest water absorption behaviour 3.86% and 5.51%, respectively, in 28 days) as well as thickness swelling effect, whereas hybrid J-Ro and J-J-Ro composites showed the least water absorption (2.65% and 3.76%, respectively) in 28 days) in both the tests. The hybridisation between jute and roselle fibres reduced water absorption behaviour and improved the fibres dimensional stability. The entire composites showed a decreasing trend for both tensile strength and tensile modulus strength after five weeks of water immersion. Jute fibre composite hybridised with roselle fibre can be used to reduce the total reduction of both tensile strength and tensile modulus throughout the whole immersion period. Moreover, the tensile testing showed that jute fibre composite hybridised with roselle fibre have produced the strongest composite with the highest tensile and modulus strength compared to other types of composites. The hybridisation of diverse fibre reinforcements aids in minimising the composite water absorption and thickness swelling, hence reducing the effect of tensile characteristics.

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An Experimental and Numerical Study of Low Velocity Impact of Unsaturated Polyester/Glass Fibre Composite

Materials Science ◽

10.5755/j01.ms.17.4.773 ◽

2011 ◽

Vol 17 (4) ◽

Author(s):

Sanita ZIKE ◽

Kaspars KALNINS ◽

Olgerts OZOLINS ◽

Maris KNITE

Keyword(s):

Glass Fibre ◽

Numerical Study ◽

Fibre Composite ◽

Unsaturated Polyester ◽

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact ◽

Glass Fibre Composite

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Tensile Mechanical Properties of Natural Fibre Composites – A Statistical Approach

10.21203/rs.3.rs-369937/v1 ◽

2021 ◽

Author(s):

Hamdi LAOUICI ◽

Asma Benkhelladi ◽

Ali Bouchoucha

Keyword(s):

Mechanical Properties ◽

Chemical Treatment ◽

Volume Fraction ◽

Treatment Time ◽

Hybrid Composites ◽

Fibre Composite ◽

Natural Fibre ◽

Resin Matrix ◽

Treatment Volume ◽

Single Matrix

Abstract The main objective and the originality of this work are to create a hybrid-natural fibre composite by the RMS method. Hybrid composites are manufactured by combining two or more dissimilar kinds of fibre in a single matrix. In the first section, Response Surface Methodology (RSM) using a Box-Behnken experimental design and the Analysis of Variance (ANOVA) are applied to investigate the effects of the type of fibres, chemical treatment, volume fraction and treatment time on the mechanical properties (ultimate tensile strength and Young’s modulus) in the tensile quasi-static loading when used two resins namely, epoxy and polyester. In the studied range, statistical analysis of the results showed that selected variables had a significant effect on the mechanical properties, except the treatment time that has a very weak significance effect on the mechanical properties. Then, to maximize the mechanical properties, the optimal conditions coded by RSM were found: the type of fibres (X 1 ) of [-0.28 and -0.33], the chemical treatment (X 2 ) of -1, the volume fraction of fibre (X 3 ) of 1 and the treatment duration (X 4 ) of [-0.97 and -1] for epoxy resin matrix. Similarly, when used the polyester resin matrix; the type of fibres (X 1 ) of -0.26, the chemical treatment (X 2 ) of -1, the volume fraction (X 3 ) of 0.99 and the sinking time (X 4 ) of [-0.94 and -0.93]. The obtained optimum parameters were confirmed experimentally in the second section

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Preparation of GF/Wollastonite Reinforced Epoxy Hybrid Composite: Mechanical Properties

Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences ◽

10.52763/pjsir.phys.sci.58.1.2015.26.33 ◽

2015 ◽

Vol 58 (1) ◽

pp. 26-33

Author(s):

Gowkanapalli Ramachandra Reddy ◽

Mala Ashok Kumar Kumar ◽

Ati Ramesh ◽

Mehaboob Basha ◽

Nadadur Karthikeyan ◽

...

Keyword(s):

Mechanical Properties ◽

Glass Fibre ◽

Composite System ◽

Hybrid Composites ◽

Fibre Composite ◽

Fibre Length ◽

System Effect ◽

Glass Fibre Reinforced ◽

Glass Fibre Composite ◽

Hybrid Mixtures

Performance of injection moulded short wollastonite fibre and chopped glass fibre reinforced hybrid epoxy composites was studied. The results showed that hybridisation of glass fibre and wollastonitewas in congruence to epoxy glass fibre composite system. Effect of fibre length, fibre orientation in matrix and analysis and fracture surface was undertaken. The mechanical properties of injection moulded, chopped glass fibre/wollastonite/epoxy hybrid composites were investigated by considering the effect of hybridisation by these two fillers. It was observed that the tensile, flexural, and impact properties of the filled epoxy were higher than those of unfilled epoxy. The effect of filler on epoxy matrix subjected to the tensile strength and modulus was studied and compared with the rule of mixture. The actual results are marginally low as compared with the values obtained by the rule of hybrid mixtures (RoHM).

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Effects of water absorption on the mechanical properties of hybrid natural fibre/phenol formaldehyde composites

Scientific Reports ◽

10.1038/s41598-021-92457-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Sekar Sanjeevi ◽

Vigneshwaran Shanmugam ◽

Suresh Kumar ◽

Velmurugan Ganesan ◽

Gabriel Sas ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Impact Strength ◽

Water Absorption ◽

Hybrid Composites ◽

Phenol Formaldehyde ◽

Natural Fibre ◽

The Other ◽

Fibre Reinforcement ◽

Dry Conditions

AbstractThis investigation is carried out to understand the effects of water absorption on the mechanical properties of hybrid phenol formaldehyde (PF) composite fabricated with Areca Fine Fibres (AFFs) and Calotropis Gigantea Fibre (CGF). Hybrid CGF/AFF/PF composites were manufactured using the hand layup technique at varying weight percentages of fibre reinforcement (25, 35 and 45%). Hybrid composite having 35 wt.% showed better mechanical properties (tensile strength ca. 59 MPa, flexural strength ca. 73 MPa and impact strength 1.43 kJ/m2) under wet and dry conditions as compared to the other hybrid composites. In general, the inclusion of the fibres enhanced the mechanical properties of neat PF. Increase in the fibre content increased the water absorption, however, after 120 h of immersion, all the composites attained an equilibrium state.

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