Rosniza Hamzah
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Preferred name
Rosniza Hamzah
Official Name
Rosniza, Hamzah
Alternative Name
Rosniza, H.
Hamzah, Rosniza
Rosnizah, R.
Hamzah, R.
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Scopus Author ID
55370656600
Researcher ID
AAD-3070-2019

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Mechanical properties of rice husk (Oryza sativa) reinforced low density polyethylene composites for industrial injection moulded parts

2020-03-25 , Jaya H. , Nik Noriman Zulkepli , Shayfull Zamree Abd. Rahim , Mohd Firdaus Omar , Rosniza Hamzah , Dahham O.S. , Umar M.U.

Injection moulding is one of the most widely used processes in manufacturing plastic products, which has developed into a mature technology. Injection moulding is greatly preferred in manufacturing industry because it can produce complex-shaped plastic parts with good dimensional accuracy in very short cycle times. This article is concerned with the tensile properties of low-density polyethylene (LDPE) reinforced with alkaline treated rice husk (RH) specifically for injection moulded parts. In this study, the RH/LDPE composites with different loadings of 5, 10, and 15 wt.% treated RH were feed into injection moulding machine and the moulded parts were tested using conventional universal testing machine. The results showed that the tensile and flexural properties of the RH/LDPE composites were strongly affected by the filler loadings. Furthermore, all the tensile and flexural properties of the RH/LDPE composites showed increasing trend as the filler loading increased, up to 15 wt.% treated RH.

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Impact strength of LDPE/RH composites for industrial injection moulded parts

2020-03-25 , Jaya H. , Nik Noriman Zulkepli , Shayfull Zamree Abd. Rahim , Mohd Firdaus Omar , Rosniza Hamzah , Dahham O.S. , Umar M.U.

This article is concerned with the impact properties of rice husk (RH) reinforced low density polyethylene (LDPE) specifically for injection moulded parts. In this study, the RH/LDPE composites with different loadings of 5, 10, and 15 wt.% rice husks were feed into injection moulding machine and the moulded parts were tested using compact Charpy impact tester. The results showed that the impact strength properties of the RH/LDPE composites were strongly affected by the rice husk filler loadings. Furthermore, the impact properties of the tested RH/LDPE composite specimens showed increasing trend as the filler loading increased, up to 15 wt.% rice husk loading.

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FTIR and gel content analyses of LLDPE/Date seeds composites

2020-03-25 , Elnaid A. , Nik Noriman Zulkepli , Dahham O.S. , Muhammad Azizi Azizan , Hazry Desa , Rosniza Hamzah , Umar M.U.

The potential of Date Seeds (DS) as a filler was studied. DS were collected, washed and grinned. Three different DS were used, i.e. coarse size (between 700-1000 μm), medium size (between 250-500 μm) and fine size (between 0-125 μm). After that, DS was mixed with linear low-density polyethylene (LLDPE) ar different DS content i.e. 5, 10, 15, and 20 %, and then fed into a twin-screw extruder and subsequently into an injection-moulding machine to produce LLDPE/DS biocomposite. FTIR and Gel-Content analyses were applied in order to study the properties of this composite. It is found that the composites showed five main peaks, at 3345-3347 cm-1, 2910 cm-1, 2847-2848 cm-1, 1462 cm-1, and 718-719 cm-1 respectively. These peaks indicated the existence of LLDPE polymer matrix, DS filler and the interaction between them in the composites. However, there was no significant change in the gel content of the composites compared to LLDPE control, which means the number of crosslinks between LLDPE and DS was limited. The lack of a suitable coupling agent system has effected negatively on the degree of crosslinking of the composite.

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The influence of alkali treatment on date seeds powder reinforced LLDPE composites: Flexural properties and impact strength

2020-03-25 , Elnaid A. , Nik Noriman Zulkepli , Dahham O.S. , Rosniza Hamzah , Muhammad Azizi Azizan , Hazry Desa , Umar M.U.

In this work, the influences of different concentration of sodium hydroxide (NaOH) (3, 6 and 9 wt.%) on the flexural and impact properties of linear low-density polyethylene / date seeds (LLDPE/DS) composites were examined. The LLDPE / DS ratio was fixed at 90/10 wt.% and the size of DS particles was measured at 125 - 250 micro m. The process used to synthesize the composites id extrusion followed by injuction molding process. Results showed that the presence of NaOH particularly at 6 wt.% concentration has improved the flexural and impact properties of the composite. This is due to bonding of the date seeds particles with the LLDPE matrix that reflected posativelly on the mechanical properties of the composite. However, the using of high NaOH concentration (9 wt.%) has shown an opposite trend, the increasing of surface roughness of the fiber after 9% NaOH treatment has reduced the flexibility of the composite and made it stiffer and more rigid, which in turn made it easy to break during mechanical test.

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Flexural properties of rice husk (Oryza sativa) reinforced low density polyethylene composites for industrial injection moulded parts

2020-03-25 , Jaya H. , Nik Noriman Zulkepli , Shayfull Zamree Abd. Rahim , Mohd Firdaus Omar , Rosniza Hamzah , Dahham O.S. , Umar M.U.

Injection moulding had been one of the best choices in plastic manufacturing industry as it manage produced complex-shaped plastic parts in very short cycle times. This article is concerned with the flexural properties of low-density polyethylene (LDPE) reinforced with rice husk (RH) filler specifically for injection moulded parts. In this study, the RH/LDPE composites with different loadings of 5, 10, and 15 wt.% RH were feed into injection moulding machine and the moulded parts were tested using conventional universal testing machine. The results showed that the flexural properties of the RH/LDPE composites were strongly affected by the filler loadings. Furthermore, all the flexural properties of the RH/LDPE composites showed increasing trend as the filler loading increased, up to 15 wt.% of RH loading.

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The effects on different date seeds loading and size of LLDPE/Date seeds composites: Flexural properties and impact strength

2020-03-25 , Elnaid A. , Nik Noriman Zulkepli , Dahham O.S. , Rosniza Hamzah , Muhammad Azizi Azizan , Hazry Desa , Umar M.U.

This work evaluated the effect of different loading and size of date seeds (DS) on some mechanical properties of LLDPE/DS composites. Three different size (125 - 250 mm, 250-500 mm, and 500 - 1000 â–¡m) and four different size loading (5, 10, 15, 20 wt%) of DS were used in this work. Flexural and Impact properties were evaluated when DS added to the LLDPE/DS composites. In order to fabricate this composite, the extrusion process followed by injection molding process was used respectively. It is found that the Flexural strength and Flexural modulus decreased with the increasing of date seeds loading in the composites. Furthermore, the Flexural properties of the composite with a coarser size of DS reduced more than other size of DS. The results of the impact strength testing have shown a similar trend of flexural properties. The LLDPE/DS composites at high DS loading show low impact strength (IS) value. Furthermore, the DS coarser size shows lower impact strength than other DS size. The reduction of the mechanical properties in the composites was probably due to the lack of a suitable coupling agent system need to be used to improve the adhesion bonding between filler and matrix.

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