scholarly journals Interfacial Adhesion Characteristics of Kenaf Fibres Subjected to Different Polymer Matrices and Fibre Treatments

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Umar Nirmal ◽  
Saijod T. W. Lau ◽  
Jamil Hashim
Keyword(s):  
Interfacial Adhesion ◽  
Single Fibre ◽  
Polymer Matrices ◽  
Alkaline Solutions ◽  
Fibre Breakage ◽  
Chemical Treatments ◽  
Fibre Pullout ◽  
Failure Morphology ◽  
Interfacial Adhesion Strength ◽  
Kenaf Fibres

This study is aimed at determining the interfacial adhesion strength (IAS) of kenaf fibres using different chemical treatments in hydrochloric (HCl) and sodium hydroxide (NaOH) with different concentrations. Single fibre pullout tests (SFPT) were carried out for both untreated and treated fibres partially embedded into three different polymer matrices; polyester, epoxy, and polyurethane (PU) as reinforcement blocks and tested under dry loading conditions. The study revealed that kenaf fibres treated with 6% NaOH subjected to polyester, epoxy, and PU matrices exhibits excellent IAS while poor in acidic treatment. The effect of SFPT results was mainly attributed to chemical composition of the fibres, types of fibre treatments, and variation in resin viscosities. By scanning electron microscopy examination of the material failure morphology, the fibres experienced brittle and ductile fibre breakage mechanisms after treatment with acidic and alkaline solutions.

Characterization of sodium hydroxide-treated kenaf fibres for biodegradable composite application

2018 ◽  
Vol 30 (8) ◽  
pp. 890-899 ◽  
Author(s):  
Aziz Hassan ◽  
MR Mohd Isa ◽  
ZA Mohd Ishak ◽  
NA Ishak ◽  
Normasmira A Rahman ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Interfacial Adhesion ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Single Fibre ◽  
Natural Fibres ◽  
Impact Properties ◽  
Chemical Surface ◽  
Biodegradable Composite ◽  
Kenaf Fibres

Natural fibres have shown immense potential as reinforcement for composites in the place of conventional fibres. Natural fibres are lightweight, cheap and environmentally friendly. However, it is already established that natural fibres have poor interaction with polymers due to its hydrophilic nature, resulting in poor interfacial adhesion, which is detrimental to the properties of the composite. Chemical surface treatment has been done to improve the interfacial adhesion. Various concentrations of sodium hydroxide (NaOH) and soaking times were employed, and the treated fibres were then characterized using thermogravimetric analyser, X-ray powder diffraction and Fourier transform infrared (FTIR) spectrometer. Single-fibre tensile tests were done on selected samples. The surface of the fibre was analysed with field-emission scanning electron microscope to study the surface morphology of the treated and untreated fibres. Generally, the treated fibres have higher thermal stability compared to untreated fibres. However, no significant trend was observed as a result of varying NaOH concentration and soak time. It was also observed that kenaf fibres treated with 4% (w/v) NaOH for 5 h exhibited the highest tensile modulus and tensile strength compared to other treated fibres. Impact properties of composites prepared from untreated and NaOH-treated kenaf were tested to confirm the finding, and it was determined that the treated kenaf composites have superior impact properties to its untreated counterpart.

scholarly journals Microbond fibre bundle pullout technique to evaluate the interfacial adhesion of polyethylene and polypropylene self reinforced composites

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
M. Sharan Chandran ◽  
K. Padmanabhan
Keyword(s):  
Composite Materials ◽  
Interfacial Adhesion ◽  
Interfacial Properties ◽  
Pullout Test ◽  
Single Fibre ◽  
Interface Properties ◽  
Reinforced Composites ◽  
Adhesion Properties ◽  
Fibre Pullout ◽  
The Matrix

Abstract Self reinforced polymer composites possess a comparable shear and tensile strength unlike the glass or carbon fibre reinforced composites. Important deciding factors of overall efficiency of composite materials are the interfacial adhesion properties between the fibre and the matrix. Structural properties and processability of composite materials are also dependent on adhesion between the fibre and the matrix. Polypropylene and polyethylene self-reinforced composites are the systems investigated here for the purpose of analyzing the interfacial properties of these systems. Multiple fibre pullout test is an alternate method for single fibre pullout test with added advantages of more reliable statistically averaged data with less standard deviation and minimized chances for fibre breakage during testing. This test can also be verified for various volume fractions unlike single fibre pullout test. Micro bonds of matrix materials are cured on a bundle of fibres and by using a micro vise as an additional fixture, the interfacial strength and other interfacial properties are evaluated through fibre pullout. Surface tension between the fibre and the matrix plays an important role in this test. Thus from the contact angle and the frictional properties of the interface, the interface properties are evaluated. Interface properties obtained from this meso-mechanical semi empirical method are also compared with the properties evaluated from micromechanical formulations. Spectroscopic studies revealed the bonding characteristics during the interface formation and after failure. Fractography reveals the cause and nature of failure and substantiate the analysis.

scholarly journals Effect of Aging Process in Different Solutions on Kenaf Fibre Structure and Its Interfacial Adhesion in Epoxy Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
A. Shalwan ◽  
M. Alajmi ◽  
A. Alajmi
Keyword(s):  
Interfacial Adhesion ◽  
Salt Water ◽  
Single Fibre ◽  
Epoxy Composites ◽  
Engine Oil ◽  
Remarkable Effect ◽  
Pull Out ◽  
Water Salt ◽  
Oil Water ◽  
Kenaf Fibres

Interfacial adhesion of kenaf fibres in epoxy composites was investigated using single fibre pull-out test. Several aged kenaf fibres were tested in this work. Two types of kenaf fibres were used in the work, those treated with 6% NaOH and those untreated kenaf fibres. Kenaf fibres were aged in engine oil, water, salt water, and diesel. The pull-out tests were performed using microtensile tests. The tests were performed at 1 mm/min loading rate. Scanning electron microscopy was used to observe the damage on the fibres and the effect of the treatment. The general results revealed that aging of the fibres reduced their strength and interfacial adhesion. Salt water showed the least effect on the strength of the fibres. At most cases, the breakage in the fibres is the main failure. In other words, there is no remarkable effect of aging on the interfacial adhesion since the most impact was on the structure of the fibres.

An Energy-Based interpretation of Interfacial Adhesion from Single Fibre Composite Fragmentation Testing

1993 ◽  
Vol 2 (5) ◽  
pp. 096369359300200 ◽  
Author(s):  
H.D. Wagner ◽  
S. Ling
Keyword(s):  
Interfacial Adhesion ◽  
Mechanical Characteristics ◽  
Interfacial Shear Strength ◽  
Fibre Composite ◽  
Stress Transfer ◽  
Single Fibre ◽  
Transfer Length ◽  
Fragmentation Test ◽  
Energy Balance Approach ◽  
Fibre Matrix

An energy balance approach is proposed for the single fibre composite (or fragmentation) test, by which the degree of fibre-matrix bonding is quantified by means of the interfacial energy, rather than the interfacial shear strength, as a function of the fibre geometrical and mechanical characteristics, the stress transfer length, and the debonding length. The validity of the approach is discussed using E-glass fibres embedded in epoxy, both in the dry state and in the presence of hot distilled water.

Characteristics of the Transfer Film and Tribological Properties of Oxide/PTFE Composites

2013 ◽  
Vol 631-632 ◽  
pp. 172-175 ◽  
Author(s):  
Ting Xie ◽  
Zheng Hua Zhou ◽  
Zhen Xing Xu ◽  
Jian Wei Yu ◽  
Ming Hua Jiao
Keyword(s):  
Adhesion Strength ◽  
Tribological Properties ◽  
Interfacial Adhesion ◽  
Measured Data ◽  
Transfer Film ◽  
Micro Hardness ◽  
Transfer Films ◽  
Ptfe Composites ◽  
Interfacial Adhesion Strength ◽  
Better Than

The formed transfer film on the counterpart surface and tribological properties of PTFE composites filled with Al2O3 or SiO2 were investigated in this paper. The results indicated that under the same friction conditions, the friction coefficients of SiO2/PTFE and Al2O3/PTFE are very close to each other, but the wear resistance of SiO2/PTFE is superior to that of Al2O3/PTFE. According to the measured data, the micro-hardness and elastic modulus of the transfer film for SiO2/PTFE are much better than those of Al2O3/PTFE. In addition, the interfacial adhesion strength between the transfer film of SiO2/PTFE and the counterface is higher. It can be proved that the mechanical properties of transfer films for PTFE composites vary with different fillers and the friction transfer film with better adhesion strength and mechanical property is useful to improve the tribological properties of the composite.

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