Papers by Keyword: Acrylic Resin

Abstract: Energy consumption in conventional domestic housing in Oman is quite high due to cost intensive mechanical air conditioning systems. For the climate conditions in Oman, it is expected that energy conservation using smart passive cool roof will be valuable and significant. This paper presents the thermal assessment and energy efficiency of a novel forced convective evaporative cooling system with radiation reflector. The results revealed that the proposed smart passive cool system can reduce the indoor air temperature of the building models, with highest reduction in the room and roof surface temperature of 13.07 °C (36.7%) and 66.42 °C (75.7%) respectively. This is due to its ability to inhibit solar radiation and dissipate heat by evaporation, forced convection due to the dynamic behavior of air in the air ventilation between primary and secondary roofs, and nocturnal radiation. The research has conclusively demonstrated that the smart passive cool roof system presented significantly lower the heat fluxes through the roofs and can be applied to residential and commercial buildings for energy consrvation

Abstract: Acrylic resin is employed in optical products such as lenses and light guiding panels because it is highly transparent. Optical components made using acrylic resin require hand polishing by skilled workers to give a mirror finish to the surface of components in order to obtain the required optical properties. However, polishing takes a lot of time and two problems that exist are that skilled workers are aging and that young skilled workers are few in number. In this research, a method of ultrasonic milling of acrylic resin which would give a mirror-surface finish to acrylic resin products without the need for hand polishing by skilled workers was proposed.

Abstract: The metallization of polymer microsphere has attracted attention in recent years due to its wide range of technological applications. In this study, chemical etching with concentrated sulfuric acid and potassium dichromate bichrome (K₂Cr₂O₇) was used to prepare acrylic resin microspheres’ surfaces for high polymer/metal adhesion. Meanwhile, the influence of etching time and temperature on the surface morphology of electroless nickel plated acrylic resin microsphere was investigated. The optimal etching process conditions were identified in this test as follows: etching temperature of 70°C and etching time of 60 ~ 90min. Specular reflection FTIR and scanning electron microscopy was employed to observe the morphology of the nickel plated films and the Ni/polymer interfacial structures. As the results shown, the effect of etching process conditions on the coating thickness and the surface topography of the film was obviously.

Abstract: The modified resins, as antibacterial coating materials, have attracted wide attention. Two steps to obtain resins: cuprous oxide collosol particle was prepared by reduction of Copper acetate solution, using hydrazine as the reducing agent, then oleic acid was added to the system as the covered agent; silicone and cuprous modified acrylic resin was successfully synthesized by solution polymerization with the monomers of acrylic acid (AA), butyl acrylate (BA), methyl methacrylate (MMA), vinyl triethoxy silane (VTES) and the as-prepared oleic acid coated Cu₂O sol, using the azobisisobutyronitrile (AIBN) as the initiator. The samples were characterized by X-ray Photoelectron Spectroscopy (XPS) and FTIR analysis. The effects of silicone content on the properties of polymer coatings were investigated by contact angle analysis.

Abstract: Recently, technologies for medical inspection have been increasing rapidly. In biomedical industry, a demand of Micro Total Analysis System (μ-TAS) has been growing which used in automatically inspection for chemical analysis. The μ-TAS have micro passageway which is constructed by many fine micro holes. Final polishing by skilled workers are carried out after drilling to obtain smooth surface of holes. Because new manufacturing technique is required instead of skilled workers, it increases productivity and cost performance of the μ-TAS. Drilling technique with low temperature environment around cutting edge is required to prevent heat crack or adhesion on holes surface, because acrylic resin heats sensitive material. In this study, ultrasonically assisted micro drilling technique is proposed to increase productivity of μ-TAS and quality of micro holes. Ultrasonically assisted machining has effective technique to improve machinability, e.g. reduce cutting force, increase chip removability and machined surface quality. This paper describes the cutting characteristics of ultrasonically assisted micro-drilling for acrylic resin to employ the μ-TAS manufacturing to solve above problems.

Abstract: Countertop of integrated cabinet is the maximum number of contacts and the highest cost component, its material quality directly determines the final using functions. Artificial stone is an ideal material for the cabinet countertop, in order to solve its high cost, easy to crack and deformation problem, we try to develop a new technology to manufacture wood-based artificial stone composite board, which take particle board as core material and artificial stone as a surface material. Article studied the mechanism of composite materials, analyzed the selection principle of raw material for wood-based artificial stone composite countertop, designed two form structure of wood-based artificial stone composite countertop for integrated cabinet. Studied the process techniques and determined the production technology lines and optimum process parameters. Wood-based artificial stone composite countertop not only saved the usage amount of artificial stone, but also retain its lots of advantages, and improved strength, reduced costs, opening up the application scope of artificial stone materials.

Abstract: Room-temperature SiO₂ atomic layer deposition (ALD) on soft, flexible materials of acrylic resin and polystyrene is developed using tris (dimethylamino) silane and plasma-excited water vapor. The growth rate is measured to be 0.13 nm/cycle at room temperature on the acrylic resin surface. The SiO₂ coating on the soft materials was examined by X-ray photoelectron spectroscopy and an organic solvent resistant test. This process is applicable as a surface treatment for improving chemical resistivity of the soft materials.

Abstract: In this paper, nanocrystalline cellulose (NCC) was prepared from bleached aspen kraft pulp by the method of sulfuric acid hydrolysis. The morphology and the size of NCC were characterized by atomic force microscopy(AFM) and X-ray diffraction(XRD). The acrylic resin /NCC composite was prepared by physical blends of acrylic resin and NCC. The physical-mechanical properties of the film from acrylic resin /NCC composite were measured . The results show that the resulting NCC has a rigid rod-shape structure with crystallinity of more than 80%, 26.51 nm in diameter and 200―400 nm in length. The dosage of NCC has important influnce on the physical-mechnical properties of the film from acrylic resin /NCC composite. The tensile strength, the moisture permeability and water absorption of the film increase with the dosage of NCC notably, the elongation at break of the resulting film decreases compared to the control sample..

Abstract: The core-shell acrylic resin emulsion is prepared by seed polymerization technology, with styrene, methyl methacrylate, acrylonitrile as monomer, butyl acrylate, methyl methacrylate, acrylic acid as shell monomer, and the of nanoTiO₂ is introducted in shell emulsion. Infrared spectroscopy were used to characterize the structure of the prepared coating agent. The preparation of TiO₂/acrylic resin emulsion for leather finishing agent, and discusses its influence on the leather properties. The results show that the synthetic finishing agents for dyeing after the fatliquoring leather finishing, good finishing effect can be obtained.

Abstract: The digital image correlation method was used in this study to investigate heat polymerizable acrylic resin, which is the material of choice for prosthesis in edentulous patients. The aim was to analyze and determine the force-induced displacement and strain of a complete denture in the physiological force field of edentulous patients. An acrylic lower complete denture was made for the edentulous mandible, placed on the residual ridge of the macerated mandible bone, lacquered with spray, and exposed to a force of 300 N. The Digital Image Correlation system (DIC) (GOM, Braunschweig, Germany) was used to measure the strain in the complete denture, consisting of two digital cameras and the software ARAMIS (6.2.0, Braunschweig, Germany). Both fields indicated the maximum dimensional changes occurred just below the point of force incidence. The displacement field registered movements in the range from 0.165 to 0.782 mm and the principal strain field showed strain values between 1.25 and 18.94%. In vitro investigation of the dynamic behavior of the lower complete denture under load by using the optical measuring system-DIC demonstrated that the strain/displacement alterations were generally influenced by prosthesis movement toward the residual alveolar ridge.