The effect of alkalization on the mechanical and water absorption properties of nonwoven kenaf fiber/unsaturated polyester composites produced by resin-transfer molding

2015 ◽  
Vol 37 (12) ◽  
pp. 3516-3526 ◽  
Author(s):  
Dody Ariawan ◽  
Z.A. Mohd Ishak ◽  
M.S. Salim ◽  
R. Mat Taib ◽  
M.Z. Ahmad Thirmizir ◽  
...  
Keyword(s):  
Water Absorption ◽  
Unsaturated Polyester ◽  
Resin Transfer Molding ◽  
Absorption Properties ◽  
Kenaf Fiber ◽  
Transfer Molding ◽  
Polyester Composites

Wettability and interfacial characterization of alkaline treated kenaf fiber-unsaturated polyester composites fabricated by resin transfer molding

2015 ◽  
Vol 38 (3) ◽  
pp. 507-515 ◽  
Author(s):  
Dody Ariawan ◽  
Z.A. Mohd Ishak ◽  
M.S. Salim ◽  
R. Mat Taib ◽  
M.Z. Ahmad Thirmizir
Keyword(s):  
Unsaturated Polyester ◽  
Resin Transfer Molding ◽  
Kenaf Fiber ◽  
Transfer Molding ◽  
Polyester Composites

Effect of Heat Treatment on Properties of Kenaf Fiber Mat/Unsaturated Polyester Composite Produced by Resin Transfer Molding

2014 ◽  
Vol 699 ◽  
pp. 118-123 ◽  
Author(s):  
Dody Ariawan ◽  
Z.A. Mohd Ishak ◽  
R. Mat Taib ◽  
M.Z. Ahmad Thirmizir ◽  
Y.J. Phua
Keyword(s):  
Heat Treatment ◽  
Fiber Strength ◽  
Unsaturated Polyester ◽  
Resin Transfer Molding ◽  
Crystallinity Index ◽  
Cellulose Content ◽  
Molding Process ◽  
Kenaf Fiber ◽  
Transfer Molding ◽  
Ft Ir

This study investigated the effect of heatingtime during heat treatment on mechanical and physical properties of the kenaf fiber and its composites. Kenafbast fibers were modified by heat treatmentat 140°C for2.5, 5, 7.5, 10 and 12.5 hours. Composites were fabricated by resin transfer molding process with unsaturated polyester as matrices and needle-punched kenaf fiber mat as reinforces. The fiberswerecharacterized by Fourier Transform-Infra Red (FT-IR) and X-Ray Diffraction (XRD). FT-IR resultsshowedthe changesin intensity ofhemicelluloce wavelength (1736 cm-1). Besides XRD observation also confirmed the increase of cellulose content in kenafthat described to the increase of crystallinity index ofkenaf fiber with heat treatment. The single fiber strength investigation stated that the highest strength and modulus was obtained bykenaf fiber heated for10hours indrying oven. SEM observation showed the decreasing numbers of impuritieson thefibers surface with fiber treatment compared to untreated kenaf fibers. The flexural properties of composites showed a similar trend to fiber strength, but the fracture toughnesshas showedcontrary results.

KENAF/RECYCLED JUTE NATURAL FIBERS UNSATURATED POLYESTER COMPOSITES: WATER ABSORPTION/DIMENSIONAL STABILITY AND MECHANICAL PROPERTIES

2012 ◽  
Vol 01 (01) ◽  
pp. 1250010 ◽  
Author(s):  
EKHLAS A. OSMAN ◽  
ANATOLI VAKHGUELT ◽  
IGOR SBARSKI ◽  
SAAD A. MUTASHER
Keyword(s):  
Water Absorption ◽  
Hybrid Composites ◽  
Unsaturated Polyester ◽  
Natural Fibers ◽  
Fickian Diffusion ◽  
Flexural Properties ◽  
Thickness Swelling ◽  
Kenaf Fiber ◽  
Polyester Composites ◽  
Kenaf Composites

Effects of water absorption on the flexural properties of kenaf-unsaturated polyester composites and kenaf/recycled jute-unsaturated polyester composites were investigated. In the hybrid composites, the total fiber content was fixed to 20 wt%. In this 20 wt%, the addition of jute fiber varied from 0 to 75%, with increment of 25%. The result demonstrates the water absorption and the thickness swelling increased with increase in immersion time. Effects of water absorption on flexural properties of kenaf fiber composites can be reduced significantly with incorporation of recycled jute in composites formulation. The process of absorption of water was found to approach Fickian diffusion behavior for both kenaf composites and hybrid composites.

scholarly journals Durability of alkali and heat-treated kenaf fiber/unsaturated polyester composite fabricated by resin transfer molding under natural weathering exposure

2017 ◽  
Vol 37 (5) ◽  
pp. 1420-1434 ◽  
Author(s):  
Dody Ariawan ◽  
Muhamad S. Salim ◽  
Razaina Mat Taib ◽  
Mohammad Z. Ahmad Thirmizir ◽  
Zainal A. Mohammad Ishak
Keyword(s):  
Unsaturated Polyester ◽  
Resin Transfer Molding ◽  
Natural Weathering ◽  
Kenaf Fiber ◽  
Transfer Molding ◽  
Heat Treated ◽  
Polyester Composite

Tensile, Flexural and Water Absorption Properties of Bamboo Fiber/Unsaturated Polyester Composites: Effect of Calcium Carbonate Content

2020 ◽  
Vol 867 ◽  
pp. 68-74
Author(s):  
Sugiman Sugiman ◽  
Atin Martino ◽  
Paryanto Dwi Setyawan ◽  
Buan Anshari
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Water Absorption ◽  
Unsaturated Polyester ◽  
Bamboo Fiber ◽  
Flexural Properties ◽  
Carbonate Content ◽  
Absorption Properties ◽  
Polyester Composites

The paper presents the effect of CaCO3 content on the tensile, flexural and water absorption properties of bamboo fiber/polystyrene-modified unsaturated polyester composites. Two volume fractions of bamboo fibers had been used with the CaCO3 content varied from 2.5 to 10 (wt%). The tensile and flexural properties were used to characterize the composites. In addition, the water absorption and its effect of the flexural properties had also been conducted. The results showed that at the bamboo content of 30%, adding CaCO3 up to 10wt% tended to decrease the tensile strength and elastic modulus of bamboo fiber/modified unsaturated polyester composites up to 27% and 4%, respectively; however, at the bamboo content of 20%, its effect was not significant for both the tensile strength and the elastic modulus. Adding CaCO3 seemed not to have a significant effect for both the flexural strength and modulus. Having exposed in distilled water, CaCO3 did not significantly affect the water uptakes and the flexural properties of bamboo fiber/modified unsaturated polyester composites; however, the flexural strength and modulus significantly decreased in the ranges of 24 - 45% and 36 - 43%, respectively, compared to those in dry condition.

scholarly journals Effect of Graphene Nanoplatelets on Water Absorption Properties of Coconut Shell Reinforced Unsaturated Polyester Composites

2021 ◽  
Vol 2129 (1) ◽  
pp. 012072
Author(s):  
A Abdullah ◽  
M B Abu Bakar ◽  
S H Mohd ◽  
M N Masri
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Unsaturated Polyester ◽  
Compression Molding ◽  
Graphene Nanoplatelets ◽  
Coconut Shell ◽  
Absorption Properties ◽  
Chemical Treatments ◽  
Matrix Adhesion ◽  
Polyester Composites

Abstract Coconut shell (CS) reinforced unsaturated polyester (UPE) composites have been prepared by using hand lay-up and compression molding techniques. To improve fiber-matrix adhesion, the CS was chemically treated by two chemical treatments, which are alkali (NaOH) and alkali-silane with concentration NaOH (6%) and silane (2%). To enhance the performance of CS-UPE composites, graphene nano platelets (GNP) was also added as nanofiller. The water absorption tests were conducted to characterize the physical properties of the composites. The result shows that water absorption increases with the increasing GNP. The more adding of GNP fillers’ weight percentages, the higher the water absorption will be getting.

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