Artykuły w czasopismach: „Polyvinylbutyral (PVB)”

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Qu, Zuopeng, Lei Wang, Hongyu Tang, Huaiyu Ye i Meicheng Li. "Effect of Nano-SnS and Nano-MoS2 on the Corrosion Protection Performance of the Polyvinylbutyral and Zinc-Rich Polyvinylbutyral Coatings". Nanomaterials 9, nr 7 (30.06.2019): 956. http://dx.doi.org/10.3390/nano9070956.

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In this paper, four composite coatings of nano-SnS/polyvinylbutyral (PVB), nano-MoS2/PVB, nano-SnS-Zn/PVB, and nano-MoS2-Zn/PVB were prepared, and their anti-corrosion mechanism was analyzed by experimental and theoretical calculations. The results of the electrochemical experiments show that the effect of nano-MoS2 on the corrosion protection performance of PVB coating is better than that of nano-SnS in 3% NaCl solution, and that the addition of Zn further enhances this effect, which is consistent with the results of weight loss measurements. Furthermore, the observation of the corrosion matrix by the field emission scanning electron microscope (FESEM) further confirmed the above conclusion. At last, the molecular dynamics (MD) simulation were carried out to investigate the anti-corrosion mechanism of the nanofillers/PVB composites for the copper surface. The results show that both nano-SnS and nano-MoS2 are adsorbed strongly on the copper surface, and the binding energy of nano-MoS2 is larger than that of nano-SnS.

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Goncharova, P. S., G. V. Korobejnikov, E. V. Pavlenko, S. V. Borisov, M. A. Vaniev, A. B. Kochnov i I. A. Novakov. "EFFECT OF THE MOLECULAR MASS OF POLYVINYLBUTIRAL ON THE PROPERTIES OF POLYMERS BASED ON PHOSPHORUS-CONTAINING DIMETHACRYLATE". IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, nr 12(247) (24.12.2020): 60–65. http://dx.doi.org/10.35211/1990-5297-2020-12-247-60-65.

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The effect of the molecular weight of polyvinylbutyral dissolved in phosphorus-containing dimethacrylate on the rheological characteristics of solutions and the properties of polymers based on them has been studied. It was found that the dynamic viscosity of solutions containing 3% PVB with a molecular weight of 43,000, 57,000, and 95,000 g/mol compared with the viscosity of the phosphorus-containing dimethacrylate itself significantly increases. Depending on the molecular mass of polyvinylbutyral, materials obtained under the conditions of photochemically initiated polymerization are characterized by an increase of the elastic modulus during static bending up to 53% at a constant level of oxygen index values.

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Akinay, Yüksel, i Fatih Hayat. "Synthesis and microwave absorption enhancement of BaTiO3 nanoparticle/polyvinylbutyral composites". Journal of Composite Materials 53, nr 5 (12.07.2018): 593–601. http://dx.doi.org/10.1177/0021998318788144.

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Barium titanate (BaTiO3)-polyvinyl butyral (PVB) composites at various weight concentrations were prepared via ultrasonic probe sonicator. The sonication was carried out at 20 kHz and 70% amplitude for about 2 h and BaTiO3 nanoparticles were dispersed well in the mixture of PVB/ethanol under probe sonication. As a microwave absorbent, the microwave absorbing properties of the BaTiO3 nanoparticle-PVB composites with different mixture ratios of 5 wt.% (RAM1), 10 wt.% (RAM2) and 15 wt.% (RAM3) BaTiO3 were investigated based on transmission line theory in the frequency range from 1 GHz to 14 GHz. The minimum reflection loss (RL) of the RAM1 reaches −3.47 dB at 5.57 GHz with a matching thickness of only 7.0 mm. For RAM2 with 4 mm and 4.2 mm thickness ( tm), the RL values are less than −10 dB obtained in the frequency 10.3–13.4 GHz. The RAM3 composite with 15 wt.% BaTiO3 mixture ratio shows a minimum reflection loss of −43.8 dB at 11.01 GHz with a −15 dB bandwidth over the extended frequency range of 10.2–13.2 GHz for a thickness of 2.8 mm and −44.2 dB at 4.77 GHz for a thickness of 6.5 mm.

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Kang, Tae Jin, i Seong Deok Hwang. "Effect of Matrix Toughening on the Mechanical Properties of Glass Fibre Reinforced Composite". Engineering Plastics 4, nr 4 (styczeń 1996): 147823919600400. http://dx.doi.org/10.1177/147823919600400401.

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Changes in morphology and mechanical properties of glass fibre reinforced composites fabricated using a polyvinylbutyral (PVB) modified phenolic resol resin were studied. The PVB modified phenolic resin systems possessed discrete spheres of PVB evenly dispersed in a phenolic resin matrix at low thermoplastic content. However, at higher concentrations, phase inversion resulted, and the morphology consisted of discrete spheres of phenolic resin embedded in a PVB matrix. The mechanical properties of neat resin films showed maximum values with PVB content of 66.7 phr. But the tensile and flexural properties of the glass fibre composite showed the highest values with PVB 25-42.9 phr, lower PVB levels than those of neat resin films. The tensile and flexural moduli were significantly improved and showed maxima at about 25-42.9 phr, unlike the neat resin films which showed a continuous decrease. The reason is that the interfacial bond between fibre and matrix plays an important role and has been altered by the addition of the PVB to the glass fibre reinforced composite. The composite with increased PVB content showed increased toughness and a smaller damaged area after a drop-weight impact test.

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Kang, Tae Jin, i Seong Deok Hwang. "Effect of Matrix Toughening on the Mechanical Properties of Glass Fibre Reinforced Composite". Polymers and Polymer Composites 4, nr 4 (maj 1996): 217–24. http://dx.doi.org/10.1177/096739119600400401.

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Changes in morphology and mechanical properties of glass fibre reinforced composites fabricated using a polyvinylbutyral (PVB) modified phenolic resol resin were studied. The PVB modified phenolic resin systems possessed discrete spheres of PVB evenly dispersed in a phenolic resin matrix at low thermoplastic content. However, at higher concentrations, phase inversion resulted, and the morphology consisted of discrete spheres of phenolic resin embedded in a PVB matrix. The mechanical properties of neat resin films showed maximum values with PVB content of 66.7 phr. But the tensile and flexural properties of the glass fibre composite showed the highest values with PVB 25-42.9 phr, lower PVB levels than those of neat resin films. The tensile and flexural moduli were significantly improved and showed maxima at about 25-42.9 phr, unlike the neat resin films which showed a continuous decrease. The reason is that the interfacial bond between fibre and matrix plays an important role and has been altered by the addition of the PVB to the glass fibre reinforced composite. The composite with increased PVB content showed increased toughness and a smaller damaged area after a drop-weight impact test.

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Kumar, Pramendra, Nida Khan i Deepak Kumar. "POLYVINYL BUTYRAL (PVB), VERSETILE TEMPLATE FOR DESIGNING NANOCOMPOSITE/COMPOSITE MATERIALS:A REVIEW". Green Chemistry & Technology Letters 2, nr 4 (14.12.2016): 185. http://dx.doi.org/10.18510/gctl.2016.244.

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In current article, the versatile behaviour of Polyvinylbutyral (PVB)and its ability to form composite materials withvarious inorganic species is reported. PVB has hydrophilic vinyl alcohol groups and hydrophobic vinyl butyral groups. These groups behave as promoters of polymer adhesive and binders for organic moieties. The composite materials of PVB have been synthesized viaphysical as well as chemical both protocols. PVB is used as a constituent part in the formation of composite, induces a specific property in a resulting one which are utilized by various ways since it has stronger in binding ability, sharper optical clarity and able for providing flexibility and toughness in the formed composite. Varioussophisticated instrumentation techniques eg FTIR, XRD, FESEM, TEM etc. are reported for characterizations of samples. The composite materials have excellent film formation properties, and can be potential candidate for photoelectric as well as photovoltaic applications. The inorganic conducting species which do not have film formation ability can be useful by composite formation along with PVB. The green protocols for synthesis of composites may also useful for biological applications.

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Vũ Thị Hải Vân, Hải Vân Thị. "THE ROLE OF COUNTER ANIONS IN ANTICORROSIVE PROPERTIES OF SILICA-POLYPYRROLE COMPOSITE". Vietnam Journal of Science and Technology 56, nr 3B (13.09.2018): 104. http://dx.doi.org/10.15625/2525-2518/56/3b/12843.

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Silica/Polypyrrole (SiO2/PPy) composites were synthesized in the presence of different counter anions as oxalate (Ox), benzoat (Bz) and dodecyl-sulfate (DoS). The morphology and properties of composites were characterized by FTIR, EDX, SEM, TGA and CV method through the two-point-electrode. The synthesized composites were loaded in polyvinylbutyral (PVB) to develop coating for mild steel substrates. A comparative study of the corrosion protection efficiency of carbon steel coated with PVB and PVB containing composites was evaluated by measurement of open circuit potential (OCP), Tafel polarization and electrochemical impedance spectroscopy (EIS). It was found that SiO2/PPyOx could provide much better protection, with the lowest current density (4.81×10-8 A.cm-2 and highest impedance modulus (6.25×10-8 Ω.cm-2) when compared with SiO2/PPyDoS and SiO2/PPyBz due to the small size and inhibitive ability of oxalate anion.

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Kojovic, Aleksandar, i Irena Zivkovic. "Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors". Chemical Industry and Chemical Engineering Quarterly 15, nr 3 (2009): 137–42. http://dx.doi.org/10.2298/ciceq0903137k.

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Embedding optical fiber sensors within laminar thermoplastic composite material results in forming a system known as 'smart structure'. These sensors present the information about the inner structure health during the material exploitation and especially in the case of exterior impacts when a geometric configuration or the property changes of the material should be expected. This paper evaluates the feasibility of the real-time monitoring of indentation and low energy impact damage in composite laminates from indentation loading and Charpy pendulum impact, using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing the indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) and aramid/metal/PVB laminates with embedded optical fibers were fabricated. Four configurations of woven composites were tested, namely, aramid/PVB, and aramid/metal/PVB in three stacking sequences of aramid and metallic woven layers. The initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through an optical fiber.

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Bora, Pritom J., Irthasa Azeem, K. J. Vinoy, Praveen C. Ramamurthy i Giridhar Madras. "Morphology controllable microwave absorption property of polyvinylbutyral (PVB)-MnO 2 nanocomposites". Composites Part B: Engineering 132 (styczeń 2018): 188–96. http://dx.doi.org/10.1016/j.compositesb.2017.09.014.

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Du, Xianbin, Xuefeng Tang, Jiajie Fang i Da-Ming Zhu. "Quartz crystal resonator study of glass transitions in polyvinylbutyral (PVB) films". Journal of Applied Polymer Science 134, nr 42 (11.07.2017): 45433. http://dx.doi.org/10.1002/app.45433.

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Roy, Aashis S., Satyajit Gupta, Sindhu Seethamraju, Giridhar Madras i Praveen C. Ramamurthy. "Impedance spectroscopy of novel hybrid composite films of polyvinylbutyral (PVB)/functionalized mesoporous silica". Composites Part B: Engineering 58 (marzec 2014): 134–39. http://dx.doi.org/10.1016/j.compositesb.2013.10.050.

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Guo, Xiao De, Feng Sheng Li, Gui Zhen Bian i Guan Peng Liu. "Coating Treatment of Mg Powders and their Water Reaction Characteristics". Advanced Materials Research 781-784 (wrzesień 2013): 2463–70. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2463.

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Double-coated Mg powders with a chloride and a polymer such as HTPB(hydroxy-terminated polybutadiene),NC(nitrocellulose),PVB(polyvinylbutyral) were fabricated by physical vapor deposition and solvent evaporation,respectively.The influence of the addition and the species of the first and second coating agents on the water reaction characteristics was investigated. The results show that both the hydrogen release during the reaction with water and the reaction rate increases distinctly with the increase of the chloride.Compared with those of the raw Mg powders and Mg powders coated with the chloride, the initial reaction temperature of the double-coated Mg powders increases to different extent.Moreover,the initial reaction temperature has an increase trend with the increase of the addition of coating agents.

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Bora, Pritom J., Mayuri Porwal, K. J. Vinoy, Praveen C. Ramamurthy i Giridhar Madras. "Influence of MnO2decorated Fe nano cauliflowers on microwave absorption and impedance matching of polyvinylbutyral (PVB) matrix". Materials Research Express 3, nr 9 (2.09.2016): 095003. http://dx.doi.org/10.1088/2053-1591/3/9/095003.

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Coleman, A. J., H. N. McMurray, G. Williams, Andreas Afseth i Geoff M. Scamans. "Filiform Corrosion on 6000 Series Aluminium: Kinetics and Inhibition Strategies". Materials Science Forum 519-521 (lipiec 2006): 629–34. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.629.

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High levels of surface shear experienced during rolling, grinding or machining can cause 6000 series aluminium to develop an ultra-fine grained surface layers which dramatically increase susceptibility to filiform corrosion (FFC) under paint films. In-situ Scanning Kelvin Probe (SKP) measurements in humid air are used to compare the kinetics and mechanism of FFC on abraded and lacquer-coated samples of high copper containing AA6111 and low level copper AA6016. FFC is initiated by applying a small volume of aqueous HCl to a penetrative defect on polyvinylbutyral (PVB) coated alloy samples prior to placement in a chamber maintained at constant humidity and temperature. The SKP is then repeatedly scanned over a fixed surface area to produce a time-lapse animation showing the dynamic evolution of localized free corrosion potential patterns. The spatial distribution of potential variation provides insight into the FFC mechanism and the numerical integration of areas of dissimilar potential provides a measure of the time-dependent area of coating delamination. Various possible FFC inhibition strategies are investigated for use under circumstances where removal of the surface layer prior to application of an organic (paint) coating is not feasible. The two strategies shown in this paper are the use of an anti-corrosion pigments based on an intrinsically conducting polymer called polyaniline. An anion-exchange pigment called hydrotalcite is also used.

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Jin, Guoxi, Jianguo Chen, Shundong Bu, Dalei Wang, Rui Dai i Jinrong Cheng. "Fabrication of 0.6(Bi0.85La0.15)FeO3-0.4PbTiO3 Multiferroic Ceramics by Tape Casting Method". MRS Proceedings 1547 (2013): 61–66. http://dx.doi.org/10.1557/opl.2013.607.

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ABSTRACTThe 0.6(Bi0.85La0.15)FeO3-0.4PbTiO3 (BLF-PT) ceramics were prepared by tape casting method. Effects of binder (polyvinylbutyl dibutyl PVB), plasticizer (phthalate-polyethylene glycol DBP-PEG) and dispersant (triethylolamine, TEA) concentration on the rheological properties of BLF-PT slurry were investigated. The optimized component ratio for ceramics powders, binder, plasticizer, dispersant and solvent (ethanol, EtOH) in the slurry was 50 wt.%, 4 wt.%, 6 wt.%, 1 wt.% and 39 wt.%. The dielectric constant εr, loss tanδ, and remnant polarization Pr of BLF-PT ceramics laminated from the tapes were 525 (1 kHz), 1.7% (1 kHz) and 30 μC/cm2 (45 kV/cm), respectively, which were comparable to those of BLF-PT ceramics prepared by traditional solid state reaction method.

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Fowkes, F. M., D. W. Dwight, J. A. Manson, T. B. Lloyd, D. O. Tischler i B. A. Shah. "Enhancing Mechanical Properties of Polymer Composites by Modification of Surface Acidity or Basicity of Fillers". MRS Proceedings 119 (1988). http://dx.doi.org/10.1557/proc-119-223.

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AbstractThe surface of a powdered glass has been treated to optimize its performance as a filler in polymer composites cast from solution. The aim has been to enhance acid-base interactions between the functional sites of polymers and the surface sites of the glass particles so as to insure complete coverage of the glass particles by adsorbed polymer molecules, and to thereby enhance both the adhesion and dispersion of the filler. The glass chosen for this study is a magnesium aluminum silicate of very low alkali metal content, and its surface sites have negligible basicity and only moderate acidity, as evidenced by weak adsorption of polymethylmethacrylate and negligible adsorption of chlorinated polyvinylchloride from solution in methylene chloride. Because of the negligible surface basicity of the filler, acidic polymers such as polyvinylbutyral and polyvinyl chloride are not adsorbed sufficiently to promote adhesion or dispersibility, and brittle or weak composites result.Surface treatments to enhance surface acidity or basicity of the glass particles were evaluated by electrophoresis in organic solvents, in which acidic particles had negative zeta-potentials and basic particles had positive zeta-potentials; untreated glass particles had zero zetapotentials. The most effective treatments were done with silane coupling agents; amino-silanes provided strong negative zeta-potentials and methacryloxy-silanes provided strong positive zeta-potentials. Angleresolved ESCA spectra showed that the adsorbed amino-silanes averaged about a monolayer in thickness and that half of the nitrogens bonded to the surface as ammonium groups and half were in the outer surface as basic amine groups; the carbonyl oxygens of the methacryloxy-silanes appeared to be bonded to the surface.Heavily-loaded polymer composites were made with the silane-treated and with untreated glass powders, using two acidic binders and a basic binder. The acidic binders were a polyvinylbutyral (PVB) binder cast from solution in a methanol-MIBK mixture, and a post-chlorinated polyvinylchloride (CPVC) binder cast from solution in a mixture of cyclohexane and tetrahydrofuran (THF): the glass transition temperature (Tg) for CPVC is about 140 C, but for PVB it is only about 35 C. The basic polymer (PEHM, polyethyl-hexylmethacrylate) has a Tg well below room temperature. Thus the extension to break in tensile tests was about 1% for CPVC, 10% for PVB, and 20 % for PEHM. About ten stress-strain Instron tests were made on each composite, and the composites with appreciable acid-base interactions between the matrix polymer and the surface sites of the treated glass fillers were in all cases much tougher than those without such acid-base interactions. The brittleness of the polyvinylbutyral composites filled with untreated glass powders was not observed at all on silane-treated glass powders.

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Sigmund, W. M., G. Wegner i F. Aldinger. "Interaction of Organic Additives with Alumina Surfaces in a Ceramic Slurry". MRS Proceedings 407 (1995). http://dx.doi.org/10.1557/proc-407-313.

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ABSTRACTThe interaction of organic additives with alumina surfaces was studied using a typical tape casting composition for alumina: solvent mixture trichloroethylene/ethanol, polyvinylbutyral (PVB) as binder and fish oil as dispersant.The characterization of the single components revealed why the dispersant Menhaden fish oil has such excellent dispersing properties for colloids and slurries. Menhaden fish oil used for wet-chemical processing was found to be a chemically polydisperse polymer with a dispersity of D=45 (by GPC) and a molecular weight of Mw=28,000.The investigation of the interaction in the highly concentrated colloidal slurry indicates that the high molecular weight fraction of fish oil is preferentially adsorbed and that an onion like supramolecular structure is formed by the ceramic particle/dispersant/binder system. The sequence in this nanostructure can be controlled by the sequence of addition of the compounds and is guided by polymer effects. The results gained on powders are supported by experimental data from surface plasmon resonance spectroscopy (SPR).

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Artykuły w czasopismach na temat „Polyvinylbutyral (PVB)”

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