scholarly journals Development and Characterization of Microwave Absorber Composite Material

2018 ◽  
Vol 7 (3.32) ◽  
pp. 54 ◽  
Author(s):  
Hashem Al-Mattarneh
Keyword(s):  
Composite Material ◽  
Natural Rubber ◽  
Barium Ferrite ◽  
Filler Content ◽  
Microwave Absorber ◽  
Microwave Properties ◽  
Electromagnetic Properties ◽  
Blending Method ◽  
Thermoplastic Natural Rubber

The rapid development of electronic systems and telecommunications has resulted in a growing and intense interest in microwave electromagnetic absorber technology and microwave absorbing composite material. This research was conducted to develop microwave absorber composites called thermoplastic natural rubber barium ferrite (TPNR-BF). The composite was characterized by determination of its physical, mechanical, magnetic and microwave properties. TPNR-BF with the fine particles barium ferrite filler content of 0-20% by weight were prepared using melt blending method. The microwave electromagnetic properties were measured using free-space microwave non-destructive testing system (MNDTS) in the frequency range of 7-13 GHz. The mechanical and Magnetic properties of the thermoplastic natural rubber-barium ferrite were also measured using Magnetometer. The effects of the different percentage of filler content on the mechanical and microwave properties of the composites have been evaluated. Both microwave dielectric constant and the reflection coefficient of TPNR-BF increase with increasing frequency and filler content while transmission coefficient decreases with increasing filler content which indicates that the composite absorbs more microwave energy by the filler. Barium ferrite contents show an inverse relation with the mechanical properties such as tensile strength and stiffness. MNDTS shows excellent capability for advanced characterization of a microwave composite material.  

Thermal Properties and Crystallisation Behaviour of Thermoplastic Natural Rubber (TPNR) Nanocomposites

2013 ◽  
Vol 812 ◽  
pp. 125-130 ◽  
Author(s):  
Siti Norasmah Surip ◽  
Z.Y. Zhang ◽  
H.N. Dhakal ◽  
N.N. Bonnia ◽  
S. H. Ahmad
Keyword(s):  
Thermal Properties ◽  
Natural Rubber ◽  
Nucleating Agent ◽  
Preparation Technique ◽  
Preparation Methods ◽  
Blending Method ◽  
Liquid Natural Rubber ◽  
Tan Δ ◽  
Thermoplastic Natural Rubber ◽  
Internal Mixer

The effect of preparation technique on the crystallisation behavior and thermal properties of TPNR filled nanoclay nanocomposites was investigated. The nanocomposites were prepared via melt blending method using internal mixer (Haake 600P). Two types of nanocomposites preparation technique were employed which is method A and B. In method A, the nanoclay was pre-mixed with liquid natural rubber (LNR) before it was charged into the other materials. For method B, the nanoclay was directly charged into the molten TPNR matrix. The result shows, preparation methods were significantly affect the crystallinity and thermal properties of TPNR nanocomposites. DSC thermogram revealed that nanocomposites crystallinity was increased when prepared by method A but decreased with method B. An increment in polypropylene crystallinity was attributed by the nanoclay which is believed to be as a nucleating agent. DMA thermogram suggested that the preparation method has affected the storage modulus and tan δ but not the glass transition temperature (tg).

Morphology and Mechanical Properties of NiZn Ferrite/Thermoplastic Natural Rubber Composite

2014 ◽  
Vol 925 ◽  
pp. 308-312 ◽  
Author(s):  
Mou'ad A. Tarawneh ◽  
Sahrim Haji Ahmad ◽  
Yu Li Jiun ◽  
Radwan Dweiri ◽  
Ibrahim N. Hassan
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Mechanical Test ◽  
Polymer Nanocomposite ◽  
Dynamic Mechanical Properties ◽  
Filler Loading ◽  
Rubber Matrix ◽  
Dynamic Mechanical ◽  
Blending Method ◽  
Thermoplastic Natural Rubber

In this paper the polymer nanocomposite of nickel zinc (NiZn) ferrite nanoparticles incorporated into the thermoplastic natural rubber nanocomposite (TPNR) were prepared via melt blending method. The effect of different NiZn loading (2-10 wt%) on morphology, tensile and dynamic mechanical properties of the obtained composites was investigated. It was found that NiZn ferrite is well dispersed in the thermoplastic natural rubber matrix. The tensile results indicated that filler loading has improved the tensile strength and Youngs modulus of the nanocomposite. However, the elongation at break decreased with increasing the percentage of NiZn. Dynamic mechanical test showed that the highest storage modulus is at 8 wt% filler. Any further increment of the filler content leads to the formation of agglomerate hence affecting the properties. The Scanning electron micrograph (SEM) micrographs reveal aspect ratio and filler orientation in the TPNR matrix also strongly promoted interfacial adhesion between the filler and the matrix to control its properties.

Development of X-ray protective garments from rare earth-modified natural rubber composites

2016 ◽  
Vol 49 (6) ◽  
pp. 527-544 ◽  
Author(s):  
Sreedha Sambhudevan ◽  
Balakrishnan Shankar ◽  
A Saritha ◽  
Kuruvilla Joseph ◽  
John Philip ◽  
...  
Keyword(s):  
Rare Earth ◽  
Natural Rubber ◽  
Filler Content ◽  
Rubber Composites ◽  
Suitable Alternative ◽  
X Ray ◽  
Toxic Material ◽  
X Ray Imaging ◽  
Natural Rubber Composites

Commonly used shielding materials while X-ray imaging by clinical persons is based on lead but incessant contact with this toxic material can pave way to severe health problems. Polymer composites, embedded with lead-free additives, especially based on natural rubber can be chosen as a suitable alternative candidate due to its lightweight, cost-effectiveness and capability to absorb regular energy region of X-ray used in medical imaging. Rubber composites were prepared with modified rare earth oxides at different filler loadings. The characterization of the filler reveals that their size falls in the nanoregime, which, in turn, supplemented to the superior properties of the composites. Mechanical properties were found to increase with filler content. X-ray shielding studies were done at different tube voltages and thicknesses and the results prove the efficacy of materials to be considered as a promising shielding resource.

Physical and Mechanical Properties of Thermoplastic Natural Rubber (TPNR) Nanocomposites

2012 ◽  
Vol 576 ◽  
pp. 394-397 ◽  
Author(s):  
Noor Azlina Hassan ◽  
Hassan Norita ◽  
Sahrim Haji Ahmad ◽  
Rozaidi Rasid ◽  
Hazleen Anuar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Maleic Anhydride ◽  
Natural Rubber ◽  
Physical And Mechanical Properties ◽  
Melt Blending ◽  
Mixing Parameters ◽  
Blending Method ◽  
Thermoplastic Natural Rubber ◽  
Internal Mixer

Thermoplastic natural rubber (TPNR) nanocomposites were prepared by melt blending method with the optimum mixing parameters (140oC, 100 rpm, 12 min) using internal mixer (Haake 600 P). The aim of this work is to study the effects of organo-montmorillonite (OMMT) on the physical and mechanical properties of TPNR with and without coupling agent (maleic anhydride grafted polyethylene, MA-PE). Significant improvement in tensile strength and modulus of TPNR nanocomposites were obtained with the presence of MA-PE.

scholarly journals Dynamic Mechanical Thermal Analysis (DMTA) of Thermoplastic Natural Rubber (TPNR) Barium Ferrite (bafe12o19) Composites

2017 ◽  
Vol 21 (1) ◽  
pp. 69 ◽  
Author(s):  
S Hamdan ◽  
D.M.A Hasihim ◽  
M Yusop
Keyword(s):  
Glass Transition ◽  
Barium Ferrite ◽  
Filler Content ◽  
Ferrite Powder ◽  
Volume Percentage ◽  
Dynamic Mechanical ◽  
The Matrix ◽  
Thermal Analyser ◽  
Thermoplastic Natural Rubber ◽  
Transition Temperature Increase

filled with 0-6 volume percentage of barium ferrite was performed using a Polymer Laboratory- Dynamic Mechanical Thermal Analyser (PL-DMTA) over a range of temperature from -100 to 100°C at 10hz. The results showed that the storage modulus (E') of the composites below the transition temperature increase with filler content up to ~3-4 volume percentage. Incorporation of the filler does not change the matrix glass transition that occurs around -40°C but the damping curve becomes broader with increasing filler content. The addition of filler in the compositedoes not affect the glass transition and melting temperature. The blend of TPNR and barium ferrite powder is only a physical mixture that does not act chemically.

The Mechanical Properties of Some Polymer Composites Based on Natural Rubber

2018 ◽  
Vol 55 (1) ◽  
pp. 115-120
Author(s):  
Maria Daniela Stelescu ◽  
Daniel Comeaga ◽  
Maria Sonmez ◽  
Dana Gurau
Keyword(s):  
Natural Rubber ◽  
Polymer Composites ◽  
Mechanical Characteristics ◽  
Filler Content ◽  
Classical Method ◽  
Mechanical Parameters ◽  
Vibration Frequencies ◽  
Internal Damping ◽  
Polyfunctional Monomer

This paper presents the development and characterization of polymer composites based on natural rubber, crosslinked using two types of vulcanization systems, as follows: the classical method using sulfur and curing accelerators and the method using peroxide in the presence of a polyfunctional monomer - trimethylolpropanetrimethacrylate. The composites were made with 0 parts to 100 parts rubber (phr) and 40 phr filler content. The physical-mechanical characteristics of resulting composites depend on the crosslinking method and on the composition. The mechanical parameters of materials were derived by processing the transmissibility curves, derived for samples with known dimensions and density. The main vibration frequencies and the quality factor, derived in the vicinity of resonances, allow to derive the elasticity and internal damping of materials.

Microwave properties of natural rubber based composites containing carbon black-magnetite hybrid fillers

2018 ◽  
Vol 25 (3) ◽  
pp. 611-620 ◽  
Author(s):  
Ahmed A. Al-Ghamdi ◽  
Omar A. Al-Hartomy ◽  
Falleh Al-Solamy ◽  
Nikolay Dishovsky ◽  
Petrunka Malinova ◽  
...  
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Microwave Properties ◽  
Synthesis And Characterization ◽  
Hybrid Filler ◽  
Hybrid Fillers ◽  
True Hybrid ◽  
Magnetite Phase ◽  
Microwave Characteristics

Abstract The paper presents the synthesis and characterization of a carbon black-magnetite hybrid filler. The complex study on the structure of the filler has shown the magnetite phase to be distributed both over the surface (inter-aggregately) and inside (intra-aggregately) the carbon black particles, thus forming a true hybrid material. The results from the investigations on the mechanical and microwave properties of natural rubber-based composites filled with the new hybrid filler have been also reported. They have been compared to those of a composite comprising the physical mixture of carbon black and magnetite (at the same ratio as in the hybrid filler). The determined microwave characteristics of the composite comprising the hybrid filler obtained reveal the possibility for its use in manufacturing elastomer-based microwave absorbers.

Effect of Boron Carbide Content on Properties of Thermoplastic Natural Rubber Composite as Thermal Neutron Shielding

2017 ◽  
Vol 888 ◽  
pp. 179-183
Author(s):  
Nurazila Mat Zali ◽  
Hafizal Yazid ◽  
Megat Harun Al Rashid Megat Ahmad ◽  
Irman Abdul Rahman ◽  
Yusof Abdullah
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Boron Carbide ◽  
Thermal Neutron ◽  
Cross Section ◽  
Weight Percent ◽  
Neutron Shielding ◽  
Blending Method ◽  
Macroscopic Cross Section ◽  
Thermoplastic Natural Rubber

In this work, thermoplastic natural rubber (TPNR) composites were produced through melt blending method. Boron carbide (B4C) as filler was added into the polymer blend (TPNR) with different weight percent from 0% to 30% and the effect of different B4C contents on mechanical and thermal neutron attenuation properties of TPNR composites has been studied. The phase formation in composites was analyzed using XRD technique. From the results, it showed that the incorporation of B4C fillers into TPNR matrix has enhanced the macroscopic cross section of the composites, however it lessens the tensile strength. Macroscopic cross section of the composites were increased from 3.34 cm-1 to 14.8 cm-1, while the tensile strength of the composites decreased from 3.79 MPa to 1.06 MPa with increasing B4C from 0 wt% to 30 wt%. B4C diffraction peaks were also increased in intensity with increasing B4C content.

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