PP and PDC

Dhaka, Bangladesh

PP and PDC

Dhaka, Bangladesh
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Shubhra Q.T.H.,University of Dhaka | Alam A.K.M.M.,Universiti Malaysia Pahang | Beg M.D.H.,Universiti Malaysia Pahang | Khan M.A.,Bangladesh Atomic Energy Commission | Gafur M.A.,PP and PDC
Journal of Composite Materials | Year: 2011

Degradable phosphate glass fiber is a synthetic fiber and silk is one of the strongest natural fibers. In this study, composites are fabricated from PP reinforced with phosphate glass fiber and silk fiber using compression molding. Tensile testing, flexural testing and impact testing are carried out to evaluate the composites mechanical properties. It has been found that silk fiber composites provided higher tensile strength (46 MPa), bending strength (50 MPa), and impact strength (17 kJ/m 2) compared to glass fiber composites which are respectively 39 MPa, 46 MPa, and 8 kJ/m 2. Degradation studies are carried out by accelerated weathering as well as by natural weathering. After weathering, the mechanical properties are evaluated and it has been found that phosphate glass fiber/PP composites degrade more rapidly compared to silk/PP composites. © The Author(s) 2010.

Khan R.A.,Bangladesh Atomic Energy Commission | Khan M.A.,Bangladesh Atomic Energy Commission | Zaman H.U.,Bangladesh Atomic Energy Commission | Noor N.,University of Dhaka | And 8 more authors.
Polymer - Plastics Technology and Engineering | Year: 2010

Polyethylene terephthalate (PET) granules were grafted with methyl acrylate (MA) from the solution containing 10% MA in methanol (86%) solvent and photo initiator (4%) for 10 min and then cured under UV radiation. MA-grafted PET films were prepared at 260°C and 5 ton pressure using heat press. Jute fabric-reinforced, MA-grafted, PET-based composites (25% fiber by weight) were fabricated by compression molding. Mechanical, thermal and soil degradation tests of the composites were performed. It was found that the MA grafted PET composites showed higher mechanical properties over the ungrafted PET/jute composite. © Taylor & Francis Group, LLC.

Huq T.,Dhaka University of Engineering and Technology | Khan A.,Dhaka University of Engineering and Technology | Noor N.,Dhaka University of Engineering and Technology | Saha M.,Dhaka University of Engineering and Technology | And 3 more authors.
Polymer - Plastics Technology and Engineering | Year: 2010

Jute fiber mat (hessian cloth) reinforced PET-based composites (50% fiber by weight) and E-glass fiber matreinforced PET based composites (50% fiber by weight) were fabricated by compression molding and the mechanical properties tensile strength (TS), tensile modulus (TM), elongation at break (%), bending strength (BS), bending modulus (BM), impact strength (IS) and hardness (Shore-A) of the composites were evaluated and compared. The interfacial properties of the both composites were also compared. Water uptake test and soil degradation test were also investigated. © Taylor & Francis Group, LLC.

Parvin F.,Bangladesh Atomic Energy Commission | Parvin F.,Jahangirnagar University | Khan M.A.,Bangladesh Atomic Energy Commission | Saadat A.H.M.,Jahangirnagar University | And 4 more authors.
Journal of Polymers and the Environment | Year: 2011

Blends based on different ratios of starch (35-20%) and plasticizer (sugar; 0-15%) keeping the amount of poly(vinyl alcohol) (PVA) constant, were prepared in the form of thin films by casting solutions. The effects of gamma-irradiation on thermal, mechanical, and morphological properties were investigated. The studies of mechanical properties showed improved tensile strength (TS) (9.61 MPa) and elongation at break (EB) (409%) of the starch-PVA-sugar blend film containing 10% sugar. The mechanical testing of the irradiated film (irradiated at 200 Krad radiation dose) showed higher TS but lower EB than that of the non-radiated film. FTIR spectroscopy studies supported the molecular interactions among starch, PVA, and sugar in the blend films, that was improved by irradiation. Thermal properties of the film were also improved due to irradiation and confirmed by thermo-mechanical analysis (TMA), differential thermo-gravimetric analysis (DTG), differential thermal analysis (DTA), and thermo-gravimetric analysis (TGA). Surface of the films were examined by scanning electron microscope (SEM) image that supported the evidence of crosslinking obtained after gamma irradiation on the film. The water up-take and degradation test in soil of the film were also evaluated. In this study, sugar acted as a good plasticizing agent in starch/PVA blend films, which was significantly improved by gamma radiation and the prepared starch-PVA-sugar blend film could be used as biodegradable packaging materials. © 2011 Springer Science+Business Media, LLC.

Shubhra Q.T.H.,University of Dhaka | Alam A.K.M.M.,Bangladesh Atomic Energy Commission | Gafur M.A.,PP and PDC | Shamsuddin S.M.,University of Dhaka | And 6 more authors.
Fibers and Polymers | Year: 2010

Natural fibers are largely divided into two categories depending on their origin: plant based and animal based. Plant based natural jute fiber reinforced polypropylene (PP) matrix composites (20 wt% fiber) were fabricated by compression molding. Bending strength (BS), bending modulus (BM), tensile strength (TS), Young's modulus (YM), and impact strength (IS) of the composites were found 44.2 MPa, 2200 MPa, 41.3 MPa, 750 MPa and 12 kJ/m2, respectively. Animal based natural B. mori silk fiber reinforced polypropylene (PP) matrix composites (20 wt% fiber) were fabricated in the same way and the mechanical properties were compared over the silk based composites. TS, YM, BS, BM, IS of silk fiber reinforced polypropylene composites were found 55.6 MPa, 760 MPa, 57.1 MPa, 3320 MPa and 17 kJ/m2 respectively. Degradation of composites in soil was measured upto twelve weeks. It was found that plant based jute fiber/PP composite losses its strength more than animal based silk fiber/PP composite for the same period of time. The comparative study makes it clear that mechanical properties of silk/PP composites are greater than those values of jute/PP composites. But jute/PP composites are more degradable than silk/PP composites i. e., silk/PP composites retain their strength for a longer period than jute/PP composites. © 2010 The Korean Fiber Society and Springer Netherlands.

Khan M.A.,Bangladesh Atomic Energy Commission | Islam T.,Bangladesh Atomic Energy Commission | Islam T.,Jacobs University Bremen | Rahman M.A.,Bangladesh Atomic Energy Commission | And 5 more authors.
Polymer - Plastics Technology and Engineering | Year: 2010

Jute fabrics/gelatin biocomposites were fabricated using compression molding. The fiber content in the composite varied from 20-60 wt%. Composites were subjected to mechanical, thermal, water uptake and scanning electron microscopic (SEM) analysis. Composite contained 50 wt% jute showed the best mechanical properties. Tensile strength, tensile modulus, bending strength, bending modulus and impact strength of the 50% jute content composites were found to be 85 MPa, 1.25 GPa, 140MPa and 9 GPa and 9.5 kJ/m2, respectively. Water uptake properties at room temperature were evaluated and found that the composites had lower water uptake compared to virgin matrix. © Taylor & Francis Group, LLC.

Pathan M.A.K.,University of Dhaka | Siddiquee K.A.M.H.,University of Dhaka | Alam S.,University of Dhaka | Islam O.,University of Dhaka | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2013

This article presents the deposition and characterization of CdS and CdHgTe thin films for the fabrication of CdHgTe/CdS structure. The growth of CdS and CdHgTe thin films on FTO-coated conducting glass substrates have been performed by chemical bath deposition (CBD) and electrodeposition methods, respectively. The deposition conditions have been optimized for getting better quality layers of CdS and CdHgTe. The grown layers of both CdS and CdHgTe have been characterized by photoelectrochemical cell (PEC) measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis spectrophotometer. Annealing effect of the deposited films has also been investigated. Finally the fabrication of CdHgTe/CdS structure has been performed and investigated by I-V characteristics. PEC, XRD, SEM and UV-vis spectrophotometer studies reveal that chemically deposited CdS layers are n-type with band gap values vary from 2.29 to 2.41 eV and cubic with (111) preferential orientation, and have spherical grain distributed over the surface. However, electrodeposited CdHgTe layers are p-type with band gap values varying from 1.50 to 1.53 eV and cubic with highly oriented CdHgTe crystallites with the (111) planes parallel to the substrate, and have uniform distribution of granular grains over the surface. The fabricated CdHgTe/CdS structure gave an open-circuit photovoltage and a short-circuit photocurrent of 510 mV and 13 mA/cm2 respectively, under AM 1.5 illumination. © 2012 Springer Science+Business Media, LLC.

Siddiquee K.A.M.H.,University of Dhaka | Pathan M.A.K.,University of Dhaka | Alam S.,University of Dhaka | Islam O.,University of Dhaka | Qadir M.R.,PP and PDC
Optik | Year: 2013

CdTe/CdS heterojunction solar cell structure has been fabricated using simple, easy and low-cost methods. To fabricate this structure, CdS and CdTe thin films are deposited onto FTO-coated conducting glass substrates by chemical bath deposition (CBD) and electrodeposition method, respectively. The optimized growth conditions are chosen for both CdS and CdTe films by investigating the optical, structural and morphological properties of both the as-deposited and annealed films. Optical measurement showed that CdS films have higher transmittance and lower absorbance, and CdTe films have lower transmittance and higher absorbance in the near infrared region. The band gap of CdS films is estimated to lie in the range 2.29-2.41 eV and that of CdTe films is in the range 1.53-1.55 eV. X-ray diffraction (XRD) study reveals that CdS and CdTe films are polycrystalline with preferential orientation of (1 1 1) plane. Scanning electron microscopy (SEM) study reveals that both films are smooth, void-free and uniformly distributed over the surface of the substrate. Fabricated CdTe/CdS structure showed the anticipated rectifying behaviour, and the rectifying behaviour is observed to improve due to CdCl2 treatment. © 2013 Elsevier GmbH.

Islam M.A.,University of Rajshahi | Islam M.S.,University of Rajshahi | Gafur M.A.,PP and PDC
International Journal of Applied Ceramic Technology | Year: 2015

La and Nd co-doped bismuth titanate Bi3 (LaxNd1-x)Ti3O12 (x = 0.4, 0.5, and 0.6) [BLNT] samples were prepared by solid-state reaction method. XRD pattern of calcined powder of BLNT ceramics indicates a single phase of bismuth-layered perovskite structure with no visible impurity phase. The sintered BLNT ceramics showed a uniform microstructure having spherical type grain. Dielectric constant was increased by co-doping due to increase in lattice distortion. Dielectric loss, AC conductance, and leakage current were drastically reduced due to La and Nd co-doping. Better performance was observed for the composition Bi3 (LaxNd1-x)Ti3O12, (x = 0.5). © 2015 The American Ceramic Society.

Bhuiyan M.K.H.,Bangladesh Agricultural University | Rahman M.M.,Bangladesh University of Engineering and Technology | Mina M.F.,Bangladesh University of Engineering and Technology | Islam M.R.,Universiti Malaysia Pahang | And 2 more authors.
Composites Part A: Applied Science and Manufacturing | Year: 2013

Isotactic polypropylene (PP) nanocomposites with multi-walled carbon nanotubes (MWCNTs) of various diameters (10-50 nm) were fabricated by extrusion and compression-molding techniques and characterized by X-ray diffraction measurements, differential scanning calorimetry, scanning electron microscopy, mechanical test and differential thermal analyses. The pure PP exhibits both the a and b-axes oriented α-crystal, whereas MWCNTs induce the b-axis orientation of the α-crystal along with the formation of minor γ-phase crystal in nanocomposites. Crystallinity, long period of lamellae, tensile strength, tensile modulus (TM) and microhardness (H) of PP considerably change by different loading and sizes of MWCNTs. The estimated values H/TM = 0.09-0.10 for all samples approach the predicted value of 0.10 for polymers. The increase in crystallinity has been demonstrated by both XRD and DSC studies. Mathematical models have been invoked to explain the changes in mechanical properties. An increase in thermal stability of polymer matrix occurs with increasing MWCN-size and loading. © 2013 Elsevier Ltd. All rights reserved.

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