A5027732944- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- biodegradable polymer synthesis and properties
- Polymer Nanocomposite Synthesis and Irradiation
- Polymer composites and self-healing
- Silicone and Siloxane Chemistry
- Plant-Derived Bioactive Compounds
- Tribology and Wear Analysis
- Plant biochemistry and biosynthesis
- Lubricants and Their Additives
- Water Quality Monitoring and Analysis
- Graphene research and applications
- Graphene and Nanomaterials Applications
- Microplastics and Plastic Pollution
- Industrial Automation and Control Systems
- Antioxidant Activity and Oxidative Stress
- TiO2 Photocatalysis and Solar Cells
- Minerals Flotation and Separation Techniques
- Thermal properties of materials
- Nanomaterials for catalytic reactions
- Polymer Synthesis and Characterization
- Magnesium Oxide Properties and Applications
- Water Quality Monitoring Technologies
- Natural product bioactivities and synthesis
- Advanced oxidation water treatment
Hanoi University of Science and Technology
2015-2024
Rubber Research Institute
2020
Natural (Czechia)
2020
Nagaoka University of Technology
2014-2016
In the present work, AlN was modified with vinyltriethoxysilane (VTES), and its effect on properties of a thermally conductive composite high impact polystyrene (HIPS), investigated. Three composites, HIPS/AlN5, HIPS/AlN9, HIPS/moAlN9, were prepared by mixing HIPS in toluene solution, followed hot pressing. The HIPS/AlN characterized tensile test, strength, flexural hardness shore D. sample HIPS/moAlN9 showed improvement these compared to that HIPS/AlN9 sample. increment those mechanical due...
In this work, prenanoemulsion of rutin was prepared using PEG and Tween as emulsifiers via homogenization evaporation techniques. The particle size investigated with high-resolution transmission electron microscopy (HR-TEM); distribution its chemical structure were analysed by nuclear magnetic resonance (NMR) Fourier transformed infrared (FT-IR) spectroscopy. It found that in the has excellent solubility water approximately 15 nm. nanorutin identical to pure rutin. suggested there is no...
The effect of the naturally occurring crosslinking junctions on green strength natural rubber, isolated from Hevea brasiliensis , was investigated by using rubber extracted Parthenium argentatum Gray (Guayule) as a model. Guayule and were characterized through nuclear magnetic resonance spectroscopy size exclusion chromatography. non‐rubber components Kjeldahl method Fourier transform infrared spectroscopy. It found that contains much higher amount fatty acids their esters while it no...
In this study, we investigated the improvement of thermal and mechanical properties Vietnam deproteinized natural rubber (DPNR) via graft copolymerization methyl methacrylate (MMA). The was achieved successfully in latex stage using tert-butyl hydroperoxide (TBHPO) tetra-ethylenepentamine (TEPA) as radical initiators at 30°C. By grafting with various MMA feeds initiator concentration <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Graft copolymerization of styrene onto deproteinized natural rubber (DPNR) using tert-butyl hydroperoxide (TBHPO) and tetraethylene pentamine (TEPA) as redox initiator have been investigated.The effects monomer concentration on conversion grafting efficiency were studied.The dynamic mechanical thermal properties the graft copolymer investigated over wide range temperatures.It is shown that a high value storage modulus for copolymer, which was about 25 times DPNR, achieved.The (DPNR-graft-PS)...
Abstract The self‐healing performance of epoxidized deproteinized natural rubber (EDPNR) and EDPNR/graphene oxide (GO) composites was investigated. Composites EDPNR25 EDPNR50 with GO contents 0.5 1.0 phr were prepared by adding a dispersion into EDPNR latex the product subsequently cast films. Tensile strengths original samples after used to evaluate performance. tensile strength achieved about 65% EDPNR25. recovery for composite increased 81% EDPNR25/GO0.5 105% EDPNR25/GO1.0 at 25°C 24 h....
The dynamic mechanical behavior of modified deproteinized natural rubber (DPNR) prepared by graft copolymerization with various styrene contents was investigated at a wide range temperatures. Graft onto DPNR performed in latex stage using tert-butyl hydroperoxide (TBHPO) and tetraethylene pentamine (TEPA) as redox initiator. properties were measured tensile test the viscoelastic resulting copolymers temperature frequency investigated. It found that strength depends on grafted polystyrene;...
ABSTRACT Fresh NR was adopted to prepare rubber with a nanomatrix structure. The structure formed by graft-copolymerization of styrene onto deproteinized fresh (fresh DPNR) in the latex stage using tert-butyl hydroperoxide/tetraethylenepentamine as an initiator. Graft-copolymer consisting DPNR and polystyrene DPNR-graft-PS) characterized 1H-NMR spectroscopy transmission electron microscopy. Under suitable condition graft-copolymerization, conversion grafting efficiency 98 80 mol%,...
Abstract Our work aims to investigate the morphology and properties of natural rubber (NR) dispersed in a polystyrene/silica hybrid nanomatrix. The nanomatrix structure was formed by graft copolymerization vinyltriethoxysilane onto NR grafted with styrene. This composed nanosilica size less than 100 nm, incorporation polystyrene resulted outstanding mechanical viscoelastic properties. tensile strength 23 MPa, storage modulus 2.54 which were 2.5 15 times higher those silica this material...
The presence of protein in the natural rubber latex for medical device manufacture seems to be most considered compound due its allergic effect.Magnetic coated alumina (Fe 3 O 4 @Al 2 ) has been known as an adsorbent organic substrates performance through physical and/or chemical interaction.In current study, we tried figure out potential Fe prepare low protein's with and without surfactant a continuous batch system.The dry content, amount, time during incubation were investigated determine...
Abstract The factors influencing the green strength of commercial solid rubbers were investigated in present study through characterization natural rubber (NR). Various such as standard Vietnam (SVR10), Indonesia (SIR10), India (ISNR10), ribbed smoked sheets (RSS3), and FNR (commercial Sumitomo Rubber) used a source. Purification samples was carried out acetone extraction purified characterized by nuclear magnetic resonance (NMR) Fourier-Transform infrared spectroscopy. Degradation found for...
Natural rubber (NR) with an in situ nanosilica nanomatrix was characterized present work. The prepared via graft copolymerization of a silane monomer, vinyltriethoxysilane (VTES), onto deproteinized NR (DPNR) latex stage using tetrapentamine (TEPA)/ tert ‐butylhydroperoxide (TBHPO) as initiators. VTES conversion more than 80% obtained, and it depended on concentration. copolymer structure by Fourier transform infrared (FT‐IR), solution‐state proton nuclear magnetic resonance ( 1 H‐NMR),...
Modification of graphene oxide (GO) by vinyltriethoxysilane (VTES) was investigated to study the effect silanized GO on radical graft copolymerization onto deproteinized natural rubber (DPNR). The modified GO, GO-VTES (a and b), characterized X-ray diffraction (XRD), Fourier-transform infrared spectroscopy, contact angle, thermal gravimetric analysis, scanning electron microscopy. XRD results showed appearance an amorphous region silica particles at a angle 22°. formation 29 Si NMR, it found...
Abstract Detection of isomerization in commercial natural rubber (NR) was performed through Nuclear Magnetic Resonance (NMR) spectroscopy conjunction with structural analysis pure NR. Three similar grades NR, which are technically specified rubbers from Vietnam (SVR10), India (SIR10) and Indonesia (ISNR10) the is prepared by precipitation latex tapping Hevea brasisliensis, were used this work. All NRs purified acetone extraction NR deproteinization extraction. The 13 C‐NMR showed that main...
Deproteinized natural rubber/graphene oxide (DPNR/GO) nanocomposite was prepared and characterized in the present work. GO synthesized by oxidation process via Hummer modified method, it with X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), water contact angle. The presence of hydrophilic functional groups sheet confirmed FT-IR, NMR characteristic XRD scattering pattern observed at about 2θ= 9.5° successful synthesis GO. incorporated...
Recently, the disposal of waste oil-in-water cutting emulsion has become an urgent issue because its extremely high chemical oxygen demand (COD). The present work focuses on treating generated from Samsung Thai-Nguyen factory in Vietnam. This used multistage methods to treat meet wastewater requirement and characterize oil recovered. consist flocculation method (stage 1) Fenton oxidation 2). after stage 1 treatment a COD reduction efficiency 98.24% at condition pH 5, Al2(SO4)3 2 g/L, C-PAM...