Yusrina Mat Daud
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Preferred name
Yusrina Mat Daud
Official Name
Yusrina, Mat Daud
Alternative Name
Daud, Yusrina Mat
Mat Daud, Yusrina
Daud, Y. M.
Yusrina, M. D.
Main Affiliation
Scopus Author ID
57210919867
Researcher ID
ABF-5167-2020

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Asas Polimer

2010 , Che Mohd Ruzaidi Ghazali , Sinar Arzuria Adnan , Yusrina Mat Daud , Luqman Musa , Mohd. Mustafa Al Bakri Abdullah

Buku asas polimer merupakan sebuah buku yang membincangkan beberapa perkara asas yang utama dalam bidang polimer. Kebanyakan kita mengetahui tentang polimer tetapi tidak pada asas dan sifat semulajadi bahan polimer tersebut. Polimer kini lebih bernilai dan diperlukan dalam bidang binaan, angkasa lepas, komunikasi, pembuatan, pengangkutan, perubatan dan lain-lain keperluan harian. Polimer yang wujud secara semulajadi termasuklah bahan yang kita guna sebagai tar, syelek, getah pokok dan lain-lain menuntut kepada kita untuk memahami dengan lebih jelas ciri-ciri dan sifat bahan polimer. Buku ini dapat memenuhi keperluan dan minat terutamanya pelajar-pelajar untuk memahami dengan lebih mendalam lagi mengenai asas-asas dan sifat-sifat bahan polimer. Tajuk-tajuk yang dibincangkan di dalam buku ini disusun dan dioleh degan cara yang mudah untuk pengajaran dan pembelajaran tentang asas-asas polimer. Buku ini sesuai dijadikan sebagai bahan rujukan asas pelajar-pelajar kejuruteraan bahan, kejuruteraan polimer, teknologi polimer dan sains. Ia juga merangkumi beberapa subjek asas yang penting dalam bidang polimer termasuk kimia polimer, struktur fizikal polimer, reologi polimer, aplikasi, sifat dan pengujian polimer.

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Corrosion Control by Using Aluminium as Sacrificial Anode Cathodic Protection (SACP) in Geopolymer Reinforced Concrete

2020-07-09 , Farah Farhana Zainal , Hawani Hanisah Ismail N. , Mohammad Firdaus Abu Hashim , Yusrina Mat Daud , Mohd. Mustafa Al Bakri Abdullah , Hasri , Hartati

This paper presents corrosion control by using Aluminium as Sacrificial Anode Cathodic Protection (SACP) in geopolymer reinforced concrete. Geopolymer concrete for this research are the combination and reaction between kaolin, which is acting as a binder, fine aggregates such as river sand, coarse aggregates and an alkaline activator which contain 12 M of sodium hydroxide (NaOH) solution and sodium silicate (Na2SiO3) solution with the ratio of NaOH/Na2SiO3 is 0.8. There are two types of sample preparation in this experiment which are the control sample without attaching with Aluminium and SACP sample that attach to Aluminium. Three testing were conducted in this research such as compressive strength, open circuit potential and gravimetric weight loss method and these results were observed after days 7 and 14. Compressive strength testing for this geopolymer concrete shows that the highest compressive strength was at sample 14 days which is 7.04 MPa while sample 7 days is 3.96 MPa. The result shows the potential values of SACP samples were lower than the control sample for both 7 and 14 days. The potential values for the SACP sample for 7 and 14 days are 0.0152 V and -0.037 V while for control sample was 0.048 V and 0.051 V respectively. From the Pourbaix diagram, the control sample was located in the passivity region while SACP sample was located in the immunity region. The corrosion rate of the reinforcement bar in concrete has been performed by the gravimetric weight loss method. Analysis of the resulting proved that the corrosion rate of SACP sample was lower than the control sample for both 7 and 14 days, which were 3.60 x 10-5 mm/yr and 1.427 x 10-5 mm/yr respectively. This is due to the presence of Aluminium which act as the sacrificial anode that protects reinforcement bar in geopolymer concrete from the corrosive agent.

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Interaction of Geopolymer Filler and Alkali Molarity Concentration towards the Fire Properties of Glass-Reinforced Epoxy Composites Fabricated Using Filament Winding Technique

2022-09-01 , Mohammad Firdaus Abu Hashim , Meor Ahmad Faris Meor Ahmad Tajudin , Mydin M.A.O. , Che Mohd Ruzaidi Ghazali , Yusrina Mat Daud , Mohd. Mustafa Al Bakri Abdullah , Farah Farhana Zainal , Saloma , Muhammad Faheem Mohd. Tahir , Heah Cheng Yong , Khorami M.

This paper aims to find out the effect of different weight percentages of geopolymer filler in glass-reinforced epoxy pipe, and which can achieve the best mechanical properties and adhesion between high calcium pozzolanic-based geopolymer matrices. Different weight percentages and molarities of epoxy hardener resin and high calcium pozzolanic-based geopolymer were injected into the glass fiber. By manually winding filaments, composite samples were produced, and they were then allowed to cure at room temperature. To determine how well the geopolymer matrices adhere to the fiber reinforcement, the microstructure of the composites’ surfaces and perpendicular sections were examined. Maximum values of compressive strength and compressive modulus were 94.64 MPa and 2373.58 MPa, respectively, for the sample with a weight percentage of filler loading of 30 wt% for an alkali concentration of 12 M. This is a relatively wide range of geopolymer weight percentage of filler loading from 10 wt% to 40 wt%, at which we can obtain high compressive properties. By referring to microstructural analysis, adhesion, and interaction of the geopolymer matrix to glass fiber, it shows that the filler is well-dispersed and embedded at the fiber glass, and it was difficult to determine the differences within the range of optimal geopolymer filler content. By determining the optimum weight percent of 30 wt% of geopolymer filler and microstructural analysis, the maximum parameter has been achieved via analysis of high calcium pozzolanic-based geopolymer filler. Fire or elevated temperature represents one of the extreme ambient conditions that any structure may be exposed to during its service life. The heat resistance or thermal analysis between glass-reinforced epoxy (GRE) pipe and glass-reinforced epoxy pipe filled with high calcium pozzolanic-based geopolymer filler was studied by investigating burning tests on the samples, which shows that the addition of high calcium pozzolanic-based geopolymer filler results in a significant reduction of the melted epoxy.

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Mechanical effects on different solid to liquid ratio of geopolymer filler in epoxy resin

2021 , Mohammad Firdaus Abu Hashim , Che Mohd Ruzaidi Ghazali , Yusrina Mat Daud , Meor Ahmad Faris bin Meor Ahmad Tajudin , Saloma Hasyim , Muhammad Taqiyuddin Lokman , Farah Farhana Zainal , Mohd. Mustafa Al Bakri Abdullah

Geopolymer is formed from the alkali activation of materials rich in Si and Al content with the addition of a silicate solution to enhance the properties of the materials. This paper presents research on the mechanical properties of fly ash-based geopolymer filler in epoxy resin by varying different solid to liquid ratios using sodium hydroxide and sodium silicate as the alkaline activator. However, the common problem observed from the solid to liquid ratio is the influence of curing time and compressive strength of geopolymer to have the best mechanical property. The mix design for geopolymers of solid to liquid ratio is essential in developing the geopolymer’s mechanical strength. A series of epoxy filled with fly ash-based geopolymer materials with different solid to liquid ratio, which is prepared from 0.5 to 2.5 solid to liquid ratio of alkaline activator. The tensile strength and flexural strength of the epoxy filled with fly ash-based geopolymer materials is determined using Universal Testing Machine under tensile and flexural mode. It was found that the optimum solid to liquid ratio is 2.0, with the optimum tensile and flexural strength value. However, both the tensile and flexural properties of epoxy filled with fly ash-based geopolymer suddenly decrease at a 2.5 solid to liquid ratio. The strength is increasing with the increasing solid to liquid ratio sample of geopolymer filler content.

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Morphological analysis on crosslinked plasticized starch filled with microcrystalline cellulose

2021-05-03 , Foong J.Y. , Mohamad Kahar Ab Wahab , Mohd Fairul Sharin Abdul Razak , Yusrina Mat Daud

This work investigates the effect of the photo and peroxide crosslinked thermoplastic starch on the morphological properties of thermoplastic starch (TPS) / microcrystalline cellulose (MCC) films. Granulated starch will converted into thermoplastic like in the presence of glycerol as plasticizer. The amount of MCC filler carried out in this research is 0 %, 3 %, 6 %, 9 % and 12 % of the dry weight of starch. The morphological properties of photo-crosslinked TPS and peroxide crosslinked TPS were were analysed by using scanning electron microscope (SEM) and optical microscope for soil burial and weathering test. Each formulation has undergone tensile test to study their stress-strain properties and the optimum formula is obtained for subsequent studies. The increasing MCC loading increase the tensile properties of the TPS/MCC up to 6% MCC as support by morphology study. The increament in tensile strength was confirmed by the SEM study that showed better dispersion of MCC in the TPS matrix and exhibited coarser surfaces as compared to uncrosslinked counterpart. The TPS/MCC films also can last more than 20 days under soil burial test. The thermoplastic starch films will start to degrade after placed under normal weathering conditions for 20 days while the addition of rainfall will also accelerate the degradation process.

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Effect of glycerol as plasticizer on the tensile properties of chitosan / microcrystalline cellulose films

2021-05-03 , Lau S. , Mohamad Kahar Ab Wahab , Yusrina Mat Daud

The chitosan/microcrystalline cellulose (MCC) film was produced through solution casting with different composition of MCC and the presence of plasticizer. This chitosan /MCC film is a biodegradable polymer due to all the ingredient was natural resources. MCC and chitosan can be found abundantly in the earth, thus, can be obtained easily. One testing was conducted which was tensile test. The optimum ratio of chitosan/MCC was 97:3 (chitosan:MCC). At this ratio, chitosan /MCC film has the highest tensile strength which was 14.73 MPa without adding any plasticizer. By the addition of plasticizer, properties of chitosan /MCC film was improved. Glycerol was used in chitosan /MCC film as plasticizer. Higher tensile strength and elongation at break follow by lower Young's modulus were the result showing that with the addition of glycerol, their film properties were able to be enhanced. About 13.57% increment in tensile strength and 47.66% in elongation at break of optimum ratio for plasticized chitosan/MCC films compared to unplasticized films.

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Pengenalan pemprosesan termoplastik

2012 , Sinar Arzuria Adnan , Che Mohd Ruzaidi Ghazali , Yusrina Mat Daud , Muthmirah Ibrahim

Buku Pengenalan Pemprosesan Termoplastik membicarakan beberapa asas pemprosesan dalam bidang polimer. Buku ini lebih memberikan tumpuan kepada beberapa pemprosesan termoplastik yang penting dalam bidang polimer. Objektif keseluruhan buku ini adalah untuk membolehkan pelajar mengenal pasti pemprosesan yang sering dilakukan pada bahan-bahan polimer termoplastik selain memahami konsep hubungkait di antara pemprosesan dan kesesuaian bahan-bahan polimer yang digunakan.

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Effect of hybrid layered silicates/geopolymer fillers on properties of epoxy composites

2018 , Yusrina Mat Daud

Layered silicates are commonly used as filler materials in polymers including thermoset to improve the matrix’s mechanical, physical and barrier properties. Montmorillonite belongs to the class of layered silicates which has great potential as filler due to its high surface area and aspect ratio with thickness of each individual layer is about 1 nm. However, the use of montmorillonite as single filler has limitation in terms of assisting the matrix to achieve high mechanical performance when subjected to various mechanical loads (compression and flexural). Therefore, in this thesis, the use of hybrid fillers was investigated using organo-montmorillonite and geopolymer fillers to obtain epoxy based composite material with greater combination properties. Raw materials geopolymer filler used in this study is from Saudi Arabia. Based on characterization of these minerals resources, it indicates the suitability of being a geopolymer filler. The preparation of the composites and hybrid composites was conducted by mechanical shear mixing method at room temperature. The effect of the organo-montmorillonite and hybrid organo montmorillonite/geopolymer fillers addition on the epoxy was thoroughly studied by compressive and flexural tests, thermal analysis, X-ray diffraction analysis and water absorption test. Epoxy/organo-montmorillonite composite was prepared with varies organo-montmorillonite loading from 1 phr to 7 phr. Results demonstrated that optimum loading of organo-montmorillonite in epoxy was achieved at 3 phr loading. This finding has leads to development of hybrid composites using optimum organo-montmorillonite content and five types of geopolymer fillers (fly ash, kaolin, white clay, pozolonite and silica sand) with loading from 1 phr to 7 phr. However, among five types of geopolymer fillers, kaolin has presented the best compressive and flexural properties at about 36.65 MPa and 20.18 MPa. The data was supported by other analysis such thermogravimetry, X-ray diffraction, and dynamic mechanical analyses. Based on these research outcomes, it can be highlighted that the use of hybrid organo-montmorillonite/geopolymer fillers can more efficiently improve the strength, thermal stability and durability of the epoxy as compared to the single organo-montmorillonite filler. These improvement has led to the exploration of exciting fields and creating novel for the production of hybrid layered silicates/geopolymer filler in epoxy composites.

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EFFECT OF COMPOSITION ON MELT FLOW AND DENSITY OF POLYPROPYLENE COPOLYMER/KAOLIN GEO-FILLER COMPOSITES

2023-01-01 , Zulkifli Z. , Yusrina Mat Daud , Farah Farhana Zainal , Mohammad Firdaus Abu Hashim , Aygörmez Y.

This study examined the effects rheological properties of different composition kaolin and kaolin geo-filler in polypropylene composites. Polypropylene composites with varying composition of kaolin geo-filler 0 wt%, 2 wt%, 4 wt%, 6 wt%, 8 wt%, and 10 wt% was prepared and compared with polypropylene composite with raw kaolin. Kaolin is an aluminosilicate based mineral filler was used to prepare geopolymer paste by combining with alkaline activator solution. The polypropylene composite was compounded using a twin-screw extruder and the melt flow index was determined by a constant weight pressure of 2.16 kg at 230°C in 10 min. Knowing the melt flow index is necessary to predict and control the process, the study has demonstrated that the composition of kaolin filler and kaolin geo-filler affects the melt flow, melt density and surface morphology at varies composition. Composites with kaolin geo-filler have demonstrated high melt flow index process and having better distribution and flow.

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Durability of inorganic fiber-reinforced alkali-activated composites

2023-01-01 , Mohammad Firdaus Abu Hashim , Yusrina Mat Daud , Mohd. Mustafa Al Bakri Abdullah

Durability and sustainability are essential serviceability concerns for alkali-activated composites used in construction. Incorporating inorganic fibers both metal and nonmetal one in alkali-activated materials is beneficial, considering their availability, are more resistant, more rigid, have an higher melting point, and are more heat resistant than traditional fibers. The durability of natural fiber-reinforced alkali-activated composites is influenced by several factors, including type and content of fiber, dispersion and size of fiber, fiber modification, fiber moisture content, fiber alkaline degradation, and fiber mineralization. Besides, this chapter indicates the durability of inorganic fiber-reinforced alkali-activated composites in terms of crack resistance and toughness, high-temperature resistance, wet/dry cycles, freeze-thaw cycles, chemical resistance, and carbonation resistance.

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