Epoxy-based composites

Epoxy-based biocomposites have been a significant topic in the continually growing field of research on green composite design for long-term applications. As a potential viable replacement to traditional glass fiber-reinforced plastics (GFRPs), 

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Epoxy-based adhesives, 10 458-459 Epoxy-based composites, 26 763 Epoxy-based powder coatings, 10 439-442 Epoxy-based thermoplastics, 10 365... 

Flow sheets for preparing the components of various monomer and oligomer reactant mixtures do not differ significantly from each other, although they may have different sets of reactors. The choice depends mainly on the physical and chemical properties of the initial components. Fig. 4.2 shows a flow sheet for obtaining continuously molded polyurethane elastomers. Fig. 4.3 illustrates an elementary flow sheet for a batch process unit for manufacturing moldings of epoxy resin or epoxy-based composites filled with quartz sand. 

Boogh, L., et al., Novel Tougheners for Epoxy Based Composites, SAMPE Conference Proceedings, vol. 28, 1996. 

Epoxies are especially reliable when used with epoxy-based composites because they have similar chemical characteristics and physical properties. Room temperature curing adhesives are often used to bond large composite structures to eliminate expensive fixtur-ing tools and curing equipment required of higher-temperature cure adhesives. However, room temperature epoxies require long cure times, so they are not suitable for large, highspeed production runs. Some of the lower-temperature composite materials are sensitive to the heat required to cure many epoxies. Epoxies are too stiff and brittle to use with flexible composites. 

Among the various applications suggested for hyperbranched polymers are surface modification, additives, tougheners for epoxy-based composites, coatings, and medicines. 

Among the various applications suggested for hyperbranched polymers are surface modification, additives, tougheners for epoxy-based composites, coatings, and medicines. It has been demonstrated that hydrophobic, fluorinated, hyperbranched poly(acrylic acid) films can passivate and block electrochemical reactions on metal surfaces thus preventing surface corrosion (Bruening, 1997). The lack of mechanical strength makes hyperbranched polymers more suitable as ad-... 

The syntheses, properties and applications of hyperbranched polyesters have been investigated in great detail [22]. The addition of hyperbranched polyesters was reported to double the interlaminar fracture resistance of epoxy-based composites and to reduce the internal stress level by as much as 80% in the pres-... 

Bak Bakar, M., Skrzypek, K. Effect of kaolin and polyurethane on the fracture and thermal properties of epoxy based compositions. Mater. Sci. 13 (2007) 39—42. 

Bug Bugncourt, E., Galy, J., Gerard, J. F., Bathel, H. Effect of sub-micron silica fillers on the mechanical performance of epoxy-based composites. Polymer 48 (2007) 1596-1605. 

Epoxide polymers have been used for many applications such as binders for glass-reinforced plastics, adhesives, impregnating materials, potting compounds, and therefore, the study of their thermal stability, including epoxy-based composites is of great practical interest. 

Fig. 23.7 Specific damping capacity versus applied maximum load (10 load cycles/load level) for (a) polypropylene-based composites with MAH-PP-treated jute wovens (b) epoxy-based composites with alkali-treated (shrinkage = 0%) unidirectional jute fibre [47]...

Figure 17.3 The improvements in stiffness and fracture toughness of epoxy based composite with soft, rigid, and rigid-soft fillers [36].

Figure 6.8 The flexural stress versus strain curves for glass fibre-reinforced CTPEGA-modified epoxy-based composites (containing 0-40 phr of CTPEGA) Reprinted with permission from D. Ratna, T.K. Chongdar and B.C. Ghakrahorty, Polymer Composites, 2004,25,165. 2004, John Wiley and Sons Publishers...

Epoxy-based compositions are based on a solid epoxy resin, a photoadd generator and a solvent. The viscosity of the inks can be tuned either by adding solvents or reactive diluents. A dynamic viscosity of 20-30 mPa s is desirable. As a sol-gel based material, an organically modified ceramic was used (19). 

Seawater aging of epoxy and vinyl ester resins reinforced with different fibers (e g. glass and carbon) has also been investigated (Narasimha Murthy et al., 2010). The experimental results have evidenced that the vinyl ester composites retain better their mechanical properties than epoxy ones in particular, the flexural strength and ultimate tensile strength (UTS) dropped by about 35% and 27% for glass/epoxy, by 22% and 15% for glass/vinyl ester, by 48% and 34% for carbon/epoxy, and by 28% and 21% for carbon/ vinyl ester composites, respectively. In contrast, the authors have shown that the water uptake of the epoxy-based composites is lower than that of the vinyl ester ones. 

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