Rozyanty Rahman
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Preferred name
Rozyanty Rahman
Official Name
Rozyanty, Rahman
Alternative Name
Rozyanty, A. R.
Rozyanty, R.
Rahman, Rozyanty Abdul
Rozyanty, Rahman
Rahman, Rozyanty A.
Rahman, R. A.
Rahman, R.
Main Affiliation
Scopus Author ID
35300412500
Researcher ID
GEK-5202-2022

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Comparison between cnt thermal interface materials with graphene thermal interface material in term of thermal conductivity

2020-01-01 , Mohamed M. , Mohd Nazri Omar , Mohamad Shaiful Ashrul Ishak , Rozyanty Rahman , Nor Zaiazmin Yahaya , Abdul Razab M.K.A. , Ahmad Thirmizir M.Z.

Thermal interface material (TIM) had been well conducted and developed by using several material as based material. A lot of combination and mixed material were used to increase thermal properties of TIM. Combination between materials for examples carbon nano tubes (CNT) and epoxy had had been used before but the significant of the studied are not exactly like predicted. In this studied, thermal interface material using graphene and CNT as main material were used to increase thermal conductivity and thermal contact resistance. These two types of TIM had been compare to each other in order to find wich material were able to increase the thermal conductivity better. The sample that contain 20 wt. %, 40 wt. % and 60 wt. % of graphene and CNT were used in this studied. The thermal conductivity of thermal interface material is both measured and it was found that TIM made of graphene had better thermal conductivity than CNT. The highest thermal conductivity is 23.2 W/ (mK) with 60 w. % graphene meanwhile at 60 w. % of CNT only produce 12.2 W/ (mK thermal conductivity).

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Effect of halogen free-flame retardants on the mechanical and morphological properties of Kenaf/Polyurethane foam composites

2020 , Nur Suhaili Mohd Soberi , Rozyanty Rahman , Firuz Zainuddin , Hazim Mohamad Amini

Kenaf/polyurethane foam (PUF) was synthesized form PUF and kenaf core fiber with expandable graphite (EG) and aluminum hydroxide (ATH) at varying amounts. In the production of polymer foam composites, the processing methods determine the properties of the final products. In this work, the potential of high energy milled on EG has reduced the EG platelet size to improve its dispersion in PUF matrix. From the results obtained, PU/KF/6ATH/10EG shows the highest mechanical properties, i.e. modulus and compression strength, while PU/KF/2ATH/5EG shows the lowest mechanical properties. Scanning Electron Microscope (SEM) shows the effect of adding kenaf fiber, EG and ATH in PUF to the foam cell structure and size.

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Effect of zinc oxide surface treatment concentration and nanofiller loading on the flexural properties of unsaturated polyester/kenaf nanocomposites

2023-09-01 , Mohammed M. , Oleiwi J.K. , Jawad A.J.a.M. , Mohammed A.M. , Azlin Fazlina Osman , Rozyanty Rahman , Tijjani Adam , Betar B.O. , Subash Chandra Bose Gopinath , Dahham O.S.

Due to environmental concerns and budgetary constraints associated with synthetic fibers, natural fibers (NFr) are becoming increasingly popular as reinforcement in polymer composites (PCs) for structural components and construction materials. The surface treatment (ST) method is a well-established technique for enhancing the strength of interfacial bonding between NFr and the polymer matrix (PM). As a result, this research aims to determine the effect of ST with zinc oxide nanoparticles (ZnONPs) on the flexural properties of unsaturated polyester (UPE)/kenaf fiber (KF) nanocomposites. The hand lay-up technique was employed to produce KF-reinforced unsaturated polyester composites (KF/UPE) for this investigation. UPE/KF-ZnONPs composites were made with varying NFr loadings (weight percent), ranging from 10 to 40%. KF was treated with five distinct amounts of ZnONPs (from 1 to 5% weight percent). According to the findings of the investigation, the composite samples incorporating ZnONPs displayed superior optimum flexural properties compared to the untreated KF composite. It was found that 2% ZnONPs was optimal, and ST with ZnONPs could produce robust KF with improved flexural properties.

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Effect of chemical treatment on tensile properties of Oil Palm Empty Fruit Bunch (OPEFB)-based All Cellulose Composite (ACC) films

2020 , Nur Liyana Izyan Zailuddin , Azlin Fazlina Osman , Rozyanty Rahman

This study explored the potential of using oil palm empty fruit bunch (OPEFB) in the production all-cellulose composite (ACC) films. The isolation process of the raw OPEFB fiber was carried out using chemical process to extract the OPEFB nanocellulose. The ACC films from the OPEFB and microcrystalline cellulose (MCC) were prepared using dimethylacetamide (DMAC) and lithium chloride solvent system whereby the partially dissolved cellulose was transformed into the matrix phase surrounding the remaining non-dissolved fiber. The ACC films containing 1, 2, 3 and 4 % (wt/vol) OPEFB cellulose and 3 % (wt/vol) microcrystalline cellulose (MCC) were prepared and the effects of 2-ethylhexyl acrylate chemical treatment of the OPEFB cellulose on tensile properties of the ACC film were investigated. Results indicate that the chemical treatment using 2-ethylhexyl acrylate has reduced the hydroxyl group composition in the cellulose and allowing greater dissolution of the cellulose during the formation of the ACC film. As a result, the tensile strength and modulus of elasticity of the ACC film were significantly enhanced. However, both untreated and treated ACC films experienced the reduction in both properties when the cellulose concentration was increased from 1 % to 4% (wt/vol), due to the saturation of the cellulose particles and non-homogeneity of the ACC system.

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The role of zinc chloride in enhancing mechanical, thermal and electrical performance of ethylene vinyl acetate/carbonized wood fiber conductive composite

2021-02-02 , Mohd Hanif Mohd Pisal , Azlin Fazlina Osman , Tan Soo Jin , Rozyanty Rahman , Alrashdi A.A. , Masa A.

Carbonized natural filler can offer the production of low cost composites with an eco-friendliness value. The evolving field of electronics encourages the exploration of more functions and potential for carbonized natural filler, such as by modifying its surface chemistry. In this work, we have performed surface modification on carbonized wood fiber (CWF) prior to it being used as filler in the ethylene vinyl acetate (EVA) composite system. Zinc chloride (ZnCl2) with various contents (2 to 8 wt%) was used to surface modify the CWF and the effects of ZnCl2 composition on the surface morphology and chemistry of the CWF filler were investigated. Furthermore, the absorptive, mechanical, thermal, and electrical properties of the EVA composites containing CWF-ZnCl2 were also analyzed. SEM images indicated changes in the morphology of the CWF while FTIR analysis proved the presence of ZnCl2 functional groups in the CWF. EVA composites incorporating the CWF-ZnCl2 showed superior mechanical, thermal and electrical properties compared to the ones containing the CWF. The optimum content of ZnCl2 was found to be 6 wt%. Surface modification raised the electrical conductivity of the EVA/CWF composite through the development of conductive deposits in the porous structure of the CWF as a channel for ionic and electronic transfer between the CWF and EVA matrix.

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The influence of MMA esterification on interfacial adhesion and mechanical properties of hybrid kenaf bast/glass fiber reinforced unsaturated polyester composites

2021 , Rozyanty Rahman , Syed Zhafer Firdaus Syed Putra , Shayfull Zamree Abd. Rahim , Irwana Nainggolan , Bartłomiej Jeż , Marcin Nabiałek , Luqman Musa , Andrei Victor Sandu , Petrica Vizureanu , Mohd. Mustafa Al Bakri Abdullah , Dariusz Kwiatkowski , Izabela Wnuk

The demand for natural fiber hybrid composites for various applications has increased, which is leading to more research being conducted on natural fiber hybrid composites due to their promising mechanical properties. However, the incompatibility of natural fiber with polymer matrix limits the performance of the natural fiber hybrid composite. In this research work, the mechanical properties and fiber-to-matrix interfacial adhesion were investigated. The efficiency of methyl methacrylate (MMA)-esterification treatments on composites’ final product performance was determined. The composite was prepared using the hand lay-up method with varying kenaf bast fiber (KBF) contents of 10, 15, 20, 25, 30, 35 (weight%) and hybridized with glass fiber (GF) at 5 and 10 (weight%). Unsaturated polyester (UPE) resin and methyl ethyl ketone peroxide (MEKP) were used as binders and catalysts, respectively. Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) were used to examine the effects of MMA-esterification treatment on tensile strength and morphology (tensile fracture and characterization of MMA-esterification treatment) of the composite fabricated. The tensile strength of MMA-treated reinforced UPE and hybrid composites are higher than that of untreated composites. As for MMA treatment, 90 min of treatment showed the highest weight percent gain (WPG) and tensile strength of KBF-reinforced UPE composites. It can be concluded that the esterification of MMA on the KBF can lead to better mechanical properties and adhesion between the KFB and the UPE matrix. This research provides a clear reference for developing hybrid natural fibers, thus contributing to the current field of knowledge related to GF composites, specifically in transportation diligences due to their properties of being lightweight, superior, and involving low production cost.

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A review on mechanical properties of hybrid reinforced polymer composite

2020-11-02 , Mustapa N.R. , Rozyanty Rahman , Mohd Hanif Mohd Pisal

Development of hybrid fiber reinforced composite as sustainable alternatives material for some industrial and engineering applications have gained significant interests over past few years. The combination of two different types of reinforcing elements in a single matrix system produce a hybrid composite with special features such as biodegradability, low cost, low specific weight, and in some cases, enhance the mechanical, thermal and water absorption properties compared to single-fiber reinforced composite. In this paper, the mechanical properties (tensile properties, flexural properties and impact strength), thermal expansion and water absorption behavior of hybrid fiber-reinforced composite were reviewed and reported.

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A review on the potential of polylactic acid based thermoplastic elastomer as filament material for fused deposition modelling

2022 , Luqman Musa , Nitiyah Krishna Kumar , Shayfull Zamree Abd. Rahim , Mohamad Syahmie Mohamad Rasidi , Allan Edward Watson Rennie , Rozyanty Rahman , Armin Yousefi Kanani , Ahmad Azrem Azmi

Currently, a range of sectors are implementing three-dimensional (3D) printing, which is a part of additive manufacturing (AM) technology via the fused deposition modelling (FDM) approach. As of now, various filament materials are available in the market and have their limitations. Thermoplastic elastomer (TPE) blend as a filament material in 3D printing should be implemented to overcome the weakness of available filaments. TPE blend stands out due to its flexibility, thermoplastic-like processability, and renewability. Based on the findings, TPE blend filament can be made with polylactic acid (PLA) thermoplastic and elastomers such as natural rubber (NR) and epoxidized natural rubber (ENR). The TPE printed components will be flexible; tough with excellent thermal and mechanical properties. In this paper, the characteristics of TPE are being reviewed to show the potential of TPE material as filament.

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Potential of Rapid Tooling in rapid heat cycle molding: a review

2022 , Nurul Hidayah Mohamad Huzaim , Shayfull Zamree Abd. Rahim , Luqman Musa , Abdellah El-hadj Abdellah , Mohd. Mustafa Al Bakri Abdullah , Allan Rennie , Rozyanty Rahman , Sebastian Garus , Katarzyna Błoch , Andrei Victor Sandu , Petrica Vizureanu , Marcin Nabiałek

Rapid tooling (RT) and additive manufacturing (AM) are currently being used in several parts of industry, particularly in the development of new products. The demand for timely deliveries of low-cost products in a variety of geometrical patterns is continuing to increase year by year. Increased demand for low-cost materials and tooling, including RT, is driving the demand for plastic and rubber products, along with engineering and product manufacturers. The development of AM and RT technologies has led to significant improvements in the technologies, especially in testing performance for newly developed products prior to the fabrication of hard tooling and low-volume production. On the other hand, the rapid heating cycle molding (RHCM) injection method can be implemented to overcome product surface defects generated by conventional injection molding (CIM), since the surface gloss of the parts is significantly improved, and surface marks such as flow marks and weld marks are eliminated. The most important RHCM technique is rapid heating and cooling of the cavity surface, which somewhat improves part quality while also maximizing production efficiencies. RT is not just about making molds quickly; it also improves molding productivity. Therefore, as RT can also be used to produce products with low-volume production, there is a good potential to explore RHCM in RT. This paper reviews the implementation of RHCM in the molding industry, which has been well established and undergone improvement on the basis of different heating technologies. Lastly, this review also introduces future research opportunities regarding the potential of RT in the RHCM technique.

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A review on the potential of polylactic acid based thermoplastic elastomer as filament material for fused deposition modelling

2022-09-01 , Luqman Musa , Krishna Kumar N. , Shayfull Zamree Abd. Rahim , Mohamad Syahmie Mohamad Rasidi , Watson Rennie A.E. , Rozyanty Rahman , Yousefi Kanani A. , Ahmad Azrem Azmi

Currently, a range of sectors are implementing three-dimensional (3D) printing, which is a part of additive manufacturing (AM) technology via the fused deposition modelling (FDM) approach. As of now, various filament materials are available in the market and have their limitations. Thermoplastic elastomer (TPE) blend as a filament material in 3D printing should be implemented to overcome the weakness of available filaments. TPE blend stands out due to its flexibility, thermoplastic-like processability, and renewability. Based on the findings, TPE blend filament can be made with polylactic acid (PLA) thermoplastic and elastomers such as natural rubber (NR) and epoxidized natural rubber (ENR). The TPE printed components will be flexible; tough with excellent thermal and mechanical properties. In this paper, the characteristics of TPE are being reviewed to show the potential of TPE material as filament.

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