A5101754737- Synthesis and properties of polymers
- Epoxy Resin Curing Processes
- High-Temperature Coating Behaviors
- Polymer Nanocomposites and Properties
- Advanced materials and composites
- Tribology and Wear Analysis
- Conducting polymers and applications
- Metal and Thin Film Mechanics
- Muon and positron interactions and applications
- Fluorine in Organic Chemistry
- Silicone and Siloxane Chemistry
- Dielectric materials and actuators
- Inorganic Fluorides and Related Compounds
- Electromagnetic wave absorption materials
- High Entropy Alloys Studies
- Thermal and Kinetic Analysis
- biodegradable polymer synthesis and properties
- Membrane Separation and Gas Transport
- Polymer crystallization and properties
- Nuclear Materials and Properties
- Copper-based nanomaterials and applications
- Advanced Photocatalysis Techniques
- Mechanical Behavior of Composites
- Bone Tissue Engineering Materials
- Fiber-reinforced polymer composites
Silesian University of Technology
2024
National Institute of Technology Patna
2022-2023
Defence Materials and Stores Research and Development Establishment
2006-2015
Research & Development Establishment (Engrs.)
1996-2014
Tata Steel (India)
2012
University of Manitoba
1982-1989
University of Idaho
1988
Abstract Hybrid composites based on isophthalate polyester and vinyl ester resin were fabricated with glass bamboo fibers. 25, 50, 75 wt % of fibers replaced by the optimized fiber reinforced subjected to dynamical mechanical analysis determine dynamic properties as a function temperature frequency. The storage modulus E ′ was found decrease increase weight fraction Loss also loading while damping property marginally. Scanning electron micrographs flexural fracture surfaces demonstrated...
Abstract This study examines sheets produced using twin-roll casting (TRC) and melt conditioned (MCTRC) to evaluate the effect of conditioning on segregation pattern grain refinement. To produce through MTCRC technique, high shear technology (high-speed rotor) was applied Al-5 Mg alloys, before subjecting TRC. A low slope used prepare a commercially pure aluminum ingot. The mean size obtained for processed samples with vibration at pouring temperature 780°C is 69.4 µm, decreasing 62.5 µm...
In this study, the surface of ultra-high-molecular-weight polyethylene (UHMWPE) fiber used as reinforcement in low-density (LDPE)/UHMWPE composites was modified by direct fluorination using elemental fluorine, (10% F2+90% He) mixture, at 25 °C. A polymer composite based on LDPE/UHMWPE fibers prepared. We studied influence treatment properties composite. The were first received, and then after fluorine (direct fluorination) their surface. Stress–strain behavior prepared samples measured....
Abstract Polymer fibers are one of the main substances used for reinforcement plastic composites. Surface modification aramid fiber was performed by direct fluorination. The crystallinity and decomposition temperature modified were increased. Scanning electron microscope shows that roughness increases in fiber. Composites prepared using unmodified fibers. It shown mechanical thermal properties increase reinforcing To reduce degradation or breakdown, composites solution casting method. POLYM....
Bisphenol-A is converted to indane bisphenol and spirobiindane bisphenol. The compounds bisphenol-A benzoxazine (BAB), (IBPB), (SBIB) are prepared by condensing the respective bisphenols with paraformaldehyde aniline. structural characterization of synthesized materials done using FTIR, 1H, 13C NMR. Curing behavior these benzoxazines glass transition temperature for polybenzoxazines studied differential scanning calorimeter (DSC). curing exotherm much influenced nature aromatic unit present...
Abstract Hydroxyapatite (HAp)/poly(vinyl alcohol phosphate) (PVAP) nanocomposite has been prepared using a solution‐based method varying HAp from 10 to 60% (w/w). X‐ray diffraction, Fourier transform infrared absorption spectra (FTIR), and thermal analysis have indicated the presence of bonding between particles PVAP matrix. Transmission electron microscope shows needle‐like crystals powder having diameter 6–10 nm length 26–38 nm. The surface roughness homogeneous dispersion in polymer...
Abstract Linear polyimides are prepared by condensation polynerization which involves the elimination of volatiles. These volatiles responsible for severe problems encountered in fabrication parts, particularly thick and large components. Some success has been attained reducing volatile level through p-staging, is generally accompanied reduced resin flow also using an intricate bleeder system a long cure cycle. A few high-temperature can be processed as thermoplastics. However, high...
Hydroxyapatite (HAp)/poly(ethylene-co-acrylic acid) composites have been synthesized by a solution-based method, using nanosized (n-HAp) and coarse hydroxyapatite (c-HAp) particles, respectively. X-ray diffraction study has indicated the development of compressive tensile stresses in because thermal expansion mismatch between particles polymer matrix. Fourier transform infrared absorption spectra analysis showed presence strong interfacial bonding polymer. The surface roughness homogeneous...
ABSTRACT High performance polymer blend of poly(ether ether ketone) (PEEK) and imide) (PEI) was examined for their free volume behavior at different compositions PEI using positron annihilation lifetime spectroscopy (PALS). The damping property the studied tan‐δ obtained from dynamic mechanical thermal analysis (DMTA). dependence on temperature revealed that is miscible in all compositions, agreement with earlier studies. peak height found to increase fraction entire composition signifying...
This study investigates the hot corrosion resistance characteristics of plasma-sprayed WC-CoCr coatings deposited on AISI 316L stainless steel. Coated and uncoated samples were exposed to a fused Na2SO4-25%NaCl salt deposit at 700 °C in cyclic conditions for fifty thermal cycles. The kinetics determined using thermogravimetric method. To determine rate, weight-change measurements taken after every cycle. X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy...
Abstract This paper examines the 50 cycles of oxidation characteristics WC-10Co-4Cr feedstock powder coatings applied by HVOF on AISI316L at three different temperatures: 750 °C, 850 and 950 °C. The kinetics were established, results for bare coated specimens compared using weight change measurements samples. surface morphology austenite steel samples was examined x-ray diffraction (XRD), scanning electron microscopy, EDS after cycle. Severe peeling-off, sputtering, spalling from oxide scale...