The scope of the present work is to toughen the commercial epoxy resin using ether linked bismaleimide (e-BMI) with varying chain lengths C4 and C8. The C4 e-BMI toughened system proves to exhibit synergistic effect on both tensile and impact strengths. Hence the secondary objective of the work is to study the effect of nano alumina on C4 e-BMI toughened epoxy. To overcome the disadvantages generated by the loose nanoparticle agglomerates dispersed in polymer composite, the nanoparticles were functionalized using 3- Glycidoxypropylmethoxysilane (GPS). The nanoindentation behavior of the C4 e-BMI epoxy matrix filled with GPS alumina was studies using Nanoindentation. The strengthening of the matrix interaction by the means of covalent bonding and better dispersion of nanoparticles resulted in enhanced nanohardness and elastic modulus. The addition of GPS Al2O3 nanoparticles to 15 wt.% C4 e-BMI/epoxy matrix increases the nanohardness and elastic modulus up to 5 wt.% of filler loading beyond which the hardness and elastic modulus decrease. 相似文献
Jute fabrics-reinforced polymer composites were prepared with different formulations using oligomer (M-1200), methanol and benzoyl peroxide. Fiber content in the composites was optimized and 55% jute content at oligomer: methanol: benzyl peroxide = 75:24.5:0.5 (w/w) ratios showed better mechanical properties. Jute fabrics were treated with potassium permanganate (KMnO4) solution of different concentrations for different soaking times. Optimized jute fabrics were soaked in the optimized formulation (F3) and cured under UV radiation at different intensities and measured their mechanical properties. Scanning electron microscopy (SEM), water uptake and soil degradation test of the treated and untreated composite samples were performed. 相似文献
Summary: UV curable acrylate formulations with a high content of fumed, nano‐sized silica were prepared to improve their application for abrasion and scratch resistant top coats. Grafting of trialkoxysilanes onto the surface of nanoparticles facilitated their embedding in the formulation and alleviated the effect of undesired increase in viscosity and dilatancy. Modified nanoparticles were obtained from several organosilanes and characterized by a multitechnique approach. To avoid problems during redispersion, in situ modification of nano‐sized silica was performed using the liquid acrylate formulation as a diluting and deagglomerating agent. These nanocomposite materials exhibit markedly improved properties as compared to neat acrylate coatings, e.g. heat, scratch, and abrasion resistance. However, a much better abrasion resistance was obtained for coatings containing both silica nanoparticles and corundum microparticles. By using various grades of corundum, a synergetic effect of nano/micro hybrid composite materials has been studied for parquet and flooring applications.
Pictures of neat polyacrylate coating (on the left) and nano/micro hybrid composite material (18 wt.‐% silica +15 wt.‐% corundum) on parquet substrate after Taber Abraser Test. 相似文献
Jute fabrics/melamine composites (20% fiber) were prepared by compression molding. Mechanical properties of the composites were evaluated. Mechanical properties of starch-treated jute/melamine composites, including tensile strength (31%), bending strength (29%), tensile modulus (23%), bending modulus (25%), impact strength (113%), and hardness (4%), inproved significantly over the untreated composite. Fracture surfaces of untreated and treated composites were studied by scanning electron microscopy (SEM) and supported poorer fiber matrix adhesion for the untreated composite than that of the treated composite. Water uptake and soil degradation tests of untreated and treated composites were also performed. 相似文献
A new class of polyimide-titania (TiO2) composites with chemical bonds between the polyimide and titania system has been synthesized by the sol–gel reaction and
characterized. The hybrid composite films were obtained by the reaction of lysine-organotitane monomer, which is formulated
as [(EtO)3Ti (lysinate)]2, followed by polycondensation with dianhyride in N-methyl-2-pyrrolidone (NMP) solution, followed by heating at 100, 200, and 300 °C. The presence of chemical bonds between
polyimide (PI) and titania has great effect on the properties of polyimide films, especially on their thermal and dielectric
properties. The dielectric constants of the resultant nanocomposites are lower than the usual polyimide films due to the increased
free volume and less polar Ti–O–Ti groups, and can be tuned by varying the molar ratio of tetraethoxysilane (TEOT) in the
feed. The polyimide units offer additional advantages of imparting thermal and mechanical strength. 相似文献
Nutraceutical industrial residues are potential fillers to fabricate green or eco-friendly polymeric composite materials as they are, less costly and easily available. Attempts have been made to use turmeric spent (TS)—a nutraceutical industry waste with a high E-factor to improve need-based properties of plastics. A series of unsaturated polyester resin composites have been fabricated with different turmeric spent content viz., 5, 10, 15 and 20% w/w. The effect of amount of filler content on tensile strength, physical properties including density and surface hardness and chemical resistance of the composites were determined. The influence of water and thermal ageing on the tensile strength of turmeric filler loaded unsaturated polyester composites has been studied. 相似文献
This paper provides a rigorous literature review in a field of glass-fiber composites. Glass-fiber composite is a type of fiber-reinforced polymer composites. Glass-fiber composite holds good properties such as low density, high strength, and easy processing, so widely used in aerospace, automotive, and construction. Fabrication of glass-fiber composite has been discussed in the present study. Combining the glass-fiber with other fibers into a single polymer matrix results in the development of hybrid glass-fiber composites. The hybridization in glass-fiber composites raised new ideas for future in the field of composites. 相似文献