Papers by Keyword: PVB

Abstract: The rare earth (Eu³⁺ and Tb³⁺) organic complex was doped into PVB matrix materials by solution blending physical method, and the fluorescent composite materials with different concentrations. The analysis indicates that the rare earth organic complexes are evenly distributed in the PVB organic matrix after heating and cooling treatment, and no chemical reaction occurs. The composite exhibits good thermal stability below 150°C; Emission spectrum of Eu complex /PVB films has shown an intense red emission at 615nm with an excitation at 400nm. From the Tb complex /PVB films a green emission at 542nm with an excitation at 254nm has been observed, which provides a new idea for developing fluorescent materials in many fields.

Abstract: Laminated glass composites are structural glass members made by assembling thin laminated panels which are connected by structural adhesives called interlayer. Laminated glass composite is a safety and security glass which enables significant improvement in the post-breakage behaviour. The interlayer of laminated glass composites ensures the integrity of the glass by holding it together. In the field of modern and innovative architectural engineering, the applications of laminated glass composites are increasing due to its lighting, aesthetics and architectural advantages. This paper introduces the buckling and vibration characteristics of different laminated glass elements using ANSYS 16.2.

Abstract: The article addresses the discoloration of historic wood after application of nanotextiles. The nanofiber fabrics used for experimental testing were made of the PVB polymer and the Paraloid B72 acrylic resin. For the verification of the possibility to increase the biocidal efficiency of historic wood have also been made nanotextile with dopants Ag ant TiO₂. Discoloration of historic wood after the application of selected nanotextiles were tested on the wood samples, which were removed from historic building Hájčí Dvůr, Praha 5. The article was written with support from the research project NAKI DF12P01OVV37: Progressive Non-Invasive Methods for the Stabilization, Conservation and Strengthening of Historic Structures and their Parts with Fiber – and Nanofiber – based Composite Materials.

Abstract: Laminated glass which consists of two glass sheets connected to each other with PVB interlayer is used in many engineering applications for years. Despite the long history of the use of laminated glass in buildings there are serious problems about delamination of laminated glass units. This paper provides information about delamination issues of laminated glass plate structures. Delamination of laminated glass unit may be due to the thinning of PVB (Polyvinyl Butyral) interlayer or the folds which occur during the manufacturing process. Laminated glass behaves in a complex manner due to the effect of geometry that undergoes large deflection even under their own weight and the order difference between the elastic modulus of glass and interlayer. Because of the mentioned reasons large deflection analysis has to be performed in the determination of the effect of delamination on the strength of laminated glasses.

Abstract: This study reports the influence of recycled poly (vinyl butyral) (PVB) in dynamic mechanical and mechanical properties of polypropylene (PP)/wood flour composites prepared in a twin screw extruder. After extrusion, the PP/wood flour composites were injection molded to obtain specimens for tensile, flexural, impact and dynamic mechanical (DMA) tests. The morphology of the composites was analyzed by scanning electron microscopy (SEM). The addition 10 wt% of PVB in PP/wood flour composite reduced from 5°C to-10°C the β transition (glass transition) peak temperature of the loss modulus. In a temperature range between 40°C and 100°C the composites containing PVB presented the highest peak in the loss modulus. The most intense tan delta peaks between 50°C and 100°C for composites containing PVB were attributed to the combined effects of PP α transition with the PVB glass transition temperature. The PP/wood flour composites with PVB presented a tendency to increase the absorbed energy by impact.

Abstract: In order to prepare special alcohol-soluble polyvinyl butyral (PVB), the reaction condition was explored in this paper after analyzing the molecular structure of PVB. Under a simple and economical condition, PVB with 14.2% of butyraldehyde group and good alcohol-solubility were prepared, the PVB film forms quickly after the volatilization of ethyl alcohol, and it has good diaphaneity, high tensile strength, and excellent mechanical properties. The highest tensile strength of the PVB film reaches 50.9MPa, which can meet some requirements of many applications.

Abstract: The shear modulus of PVB and SGP interlayer is analyzed. With the same conditions of load duration and temperature, the shear modulus of SGP interlayer is about fifteen times than that of PVB interlayer. A finite element model of laminated glass is established in this paper. The simulation results show that the maximum principal stress contours of PVB laminated glass change from a circular to a petal-shaped one and those of SGP laminated glass change form a quadrangular to a square-shaped one when the temperature rises from 20 degrees Celsius to 50 degrees Celsius.

Abstract: Laminated glass and photovoltaic laminated glass are widely used in architecture. The interfacial bonding strengths between poly(vinyl butyral) (PVB) and glass were investigated by the cross-bonding method from room temperature to -50 °C. The loading speed was 5 mm/min, and the cooling speed was about 0.5 °C/min. The testing sample was hold at each temperature for half an hour. It was revealed that the testing temperature had great effect on the bonding strength. At room temperature, the tensile bonding strength was 11.49 MPa and the shear bonding strength was 6.61 MPa. With the temperature decreased from RT to -50 °C, the tensile bonding strength was decreased by 66.81%, but the shear bonding strength was increased by 212.16%. From RT to -30 °C, the change rates of the tensile and shear bonding strength bonding strength were 65.57% and 172.68% respectively, only 3.61% and 14.48% from -30 °C to -50 °C. The mechanism for the bonding strength depended on testing temperatures from RT to -50 °C was also discussed.

Abstract: This study focuses on the development of a lightweight, high-performance cementitious composite material reinforced with Poly(vinyl alcohol) (PVA) fiber. The material which contains Poly(vinyl butyral) (PVB) as the sole aggregate has a low average density of 1548 kg/m3 and a compressive strength of about 40 MPa. The flexural strength, impact resistance, and fracture toughness are also evaluated and are found to be improved in comparison to those of lightweight concrete. The addition of PVA fiber further improves ductility, fracture toughness and impact resistance. The increase in fracture toughness was found to be linear with increasing fiber volume fraction. Comparisons are made with a lightweight concrete of equal density, and a normal-weight concrete. A model based on fiber bridging mechanics and the rule of mixtures is developed to characterize the fracture toughness, and a good correlation is obtained for the materials tested when experimental results are compared to those predicted by the model.