Papers by Keyword: Polyester Resin

Abstract: The utilization of environmentally sustainable agro-waste as Natural fibers (NF) for reinforcement in polymer bio-composites has opened up a new path for materials development. Investigation has advocated that alterations of fiber surface by either physical or chemical techniques, enhances the efficacy of NF reinforced polymer composite. plantain (Musa paradisiacal) fiber (PF) isolated from plantain pseudo steam was treated with potassium permanganate in acetone in this investigation. Using a manual lay-up and compression moulding approach, modified and unmodified fibers were employed to manufacture a NF/polyester resin bio-composite. Surface morphology shows surface roughness of PF surface after treatments. The plantain fiber bio-composites (PFB) reinforced with modified fiber shows improvement in mechanical strength under optimal conditions, providing possibilities and durability for use in technical and structural

Abstract: The study of composites made from residual organic materials and polymeric resins, has a great projection due to the use of new raw materials and the good physical, mechanical and aesthetic characteristics these materials present in the construction industry. The manufacturing processes of these composites include the necessary pressure application to generate an efficiently compact material, where matrix and reinforcement bonding are efficient. This study defines how the compaction force influences the flexural strength of composites made from polyester resin as polymer matrix, and rice husk as reinforcement material. This is achieved by testing different series of specimens, made by applying different compaction forces in a cold process, to analyse the relationship between compaction and flexural strength. Specimens are made varying only the compaction force, from 2, 5, 8, 11, 14, and 17 tons. The results show that, when the compaction force increases, the flexural strength in the composites also increases, however, there is a pressure range where the flexural strength values are very close, conditioning the use of pressure in relation to the decrease in the specimen section.

Abstract: In the field of economic and ecological material research which can replace the composite material currently used in several fields such as glass wool, research leads to a comparison of the mechanical properties and the quality of plates made from recycled materials with those of glass wool, in particular in terms of surface condition and geometric precision thus. In this study, we recycled and used damaged wool fibers in a composite material; the results showed that the new product has mechanical characteristics similar to those of fiberglass composite materials. The recycling of wool fiber reduces the cost of a product made of composite materials, with the possibility of a later study of the machinability of the plates made from this material and its use in various sectors.

Abstract: For a simulation of pultrusion processes with polyester resin C-L ISO 112 G, the curing kinetic model for the matrix material should be developed. This resin is characterized by excellent glass fibre wet out properties and for this reason is suitable for the utilization in pultrusion processes. The first order, n-th order, Prout-Tompkins and Kamal-Sourour models were used to build the curing kinetic models for the examined resin. The models’ accuracy was determined by calculating the relative errors between theoretical and experimental results. The curing kinetic models with the best accuracy are recommended for the development of future pultrusion processes.

Abstract: In this research, the results of different weight percentage of glass fiber (30, 40 & 50), cement (0, 3 & 6) and polyester resin (70, 60 & 50), on the properties of glass fiber-cement-polyester composites are investigated. The specimens are prepared by hand lay-up technique. All the specimens are tested for tensile and flexural strength as per ASTM standards. Results showed that escalation in glass fiber wt.% improved the tensile strength (by 9% at 40 wt.% and 17% at 50 wt.%) and flexural strength (by 10% at 40 wt.% and 16.5% at 50 wt.%). Whereas an increase in cement weight percentage decreases tensile strength and increases flexural strength. The failure of the sample is due to glass fiber pull out and rupture of the matrix, under tensile load.

Abstract: The natural fiber reinforced composites are least expensive material and alternative material of wood, plastic material for the construction and industrial applications. The polymer based composites are used to fabricate the automobile components. The present investigation the composite materials reinforced with sansevieria cylindrica fibers were fabricated. These fibers were used because of their impressive mechanical properties. The composite panels are fabricated by hand lay-up technique. Sansevieria cylindrica fibers and polyester resin to produce the composite material. Sansevieria cylindrica plant has each leaf 20 to 30mm thickness and height 1000 to 2000mm approximately. The chemical tests of fiber and tensile strength for different fiber length composites such as 10mm, 20mm, 30mm, 40mm, & 50mm are determined.

Abstract: Nowadays, the fire behavior of polymer composite materials is a concern in automotive applications. Due to the flammability of this type of compounds, the present study focused on analyzing the influence of the flame retardants of aluminum hydroxide and magnesium hydroxide on the flammability index. A DOE was carried out using a complete factorial design using two categorical variables (type of resin and type of retardant at two levels) and one quantitative variable (volumetric percentage of the retarder for 3 levels). Twelve combinations of composite material were manually conformed maintaining the general volumetric fraction (30% reinforcement, 70% polymer matrix). Percentages of retardants (3.6 and 9%) were part of the volumetric composition of the matrix. The performance and evaluation of the flammability test was carried out under ISO 3795: 1989 and FMVSS 302. In addition, the average temperature inside the test chamber was measured to observe its behavior during combustion. The results showed that the flammability index was significantly reduced with the use of polyester resin with retarder aluminum hydroxide at any percentage and the highest temperature inside the chamber was produced by the combustion of the epoxy resin with 9% retardant of flame.

Abstract: Fiber reinforced plastics have been widely used for manufacturing aircrafts and spacecrafts structural parts because of their high mechanical, physical properties. These are used in manufacturing of structural composites, printed circuit boards and in a wide range of special-purpose products which are included in medical field as well. Within reinforcing materials chopped strand mats are the most frequently used in structural constructions because of their properties such as viscoelasticity, strength and high thermal stability. The present work focuses on mechanical and thermal properties of chopped strand mat reinforced with polyester resin and filler as graphite powder (which has high melting point) in different weight fractions. Evaluation of material properties is tested using Thermo-Gravimetric Analysis and Dynamic Mechanical analysis at a standard temperature ranging between 20°C - 460°C and evaluated. The results show that inclusion of graphite powder in chopped strand mat exhibit better enhancement in results when compared.

Abstract: The objective of the present study is to investigate the behavior of floor coatings made of recycled isophthalic and orthophthalic type polyester resins along with industrially processed inorganic materials; gravel dust, that is the residue from crushed basaltic rocks, and fly ash generated in coal burning in power plants. The coatings were evaluated by the mechanical resistance tests: flexural strength, axial compression and abrasion and the durability tests: chemical attack, against many harmful agents, and also the water absorption test. The work proposes the use of these coatings as flooring, to be applied in the petroleum and petrochemical industry, which require high-strength materials with excellent chemical resistance. Two types of coatings were produced, one being composed of isophthalic polyester resin as binder, river sand as aggregate and fly ash as filler, and the other composed of orthophthalic polyester resin recycled from PET, river sand and gravel dust as aggregates and fly ash as filler. From the results, it was observed that the floorings reached flexural strength values of 26 MPa and 84 MPa for axial compression, and results below 0.17% for water absorption. The coatings were resistant to chemical attack from acids, bases, salt and hydrocarbons.

Abstract: Increasing concern about the environmental pollution, clear understanding of uncertainty of petroleum products resulted in the utilization of eco-friendly materials. In the present work dora hemp natural fibre is made into particulate form through chemical treatment. Then it is reinforced at 3.98 wt % into the polyester matrix to fabricate the composite lamina by “Two Stage Wet Layup”. A special focus is made in describing the hand/wet lay-up procedure. The post cured and machined composite specimens as per ASTM procedures are tested to determine the mechanical properties. Dora hemp particulate composites have showed the tensile strength, modulus 12.57 MPa, 197.47 MPa respectively. In the bending load they have showed a flexural strength, modulus of 38.08 MPa, 1.78 GPa respectively. The composites under the impact load had shown impact strength of 1.38 kJ/m².