Binders for impregnation of fibrous fillers in the production of prepregs

The article presents a review of the scientific and technical information from Russian and foreign periodicals, patents for inventions in the field of using various materials for the production of prepregs. Data on global manufacturers and applied technologies are provided. Prepreg is a polymer composite material based on carbon or glass fabrics. The technology for its production consists in impregnating the reinforcing material with a special binder. Typically, it is the resin in an uncured or partially cured state. Particular attention to polymer composite materials based on glass fibers is paid. The binder is a solution of organic substances, which is used as an impregnating agent. The combination of fibrous fillers and impregnating composition makes it easy to shape the final product. It is showed that the main areas of prepreg applications are the automotive industry, construction, transport, sports equipment, as well as various sectors of the national economyThe composite materials are shown to have a number of advantages, including economic ones. According to the conducted scientific and patent search, the most common components of polymer composite materials are epoxy resin and various types of hardeners.

Influence of Concentration of Carbon and Glass Fibers, Melt Viscosity, and Number of Extrusions on the Porosity of Composites Based on Polyphenylene Sulphone, Polyethyrimide and Polyphenylene Sulfide

A comparative analysis of the effect on the porosity of composite filaments based on polyphenylene sulfone, polyetherimide and polyphenylene sulfide with discrete fibrous fillers, such factors as the filler concentration, melt viscosity and number of extrusion passes, was carried out. It is shown that with increasing filler content and decreasing melt viscosity, the porosity of composite filaments enhances. Upon repeated extrusion carbon-filled composites, a decrease in porosity is observed, however for glass-filled samples an increase in porosity is occurred. A comparative analysis showed that the filament samples based on polyetherimide have a higher porosity. The most resistant to pore formation are polyphenylene sulfone-based samples.

An experimental study of the effect of fibrous fillers on the properties of polyolefins

The results of a study of the dependences of the physical-mechanical and tribotechnical properties of polyolefins on the content of fibrous fillers are presented. The optimal content of fibrous fillers is established. Optimum compositions of functional antifrictionwear-resistant composite materials have been developed that have sufficiently high physical, mechanical and tribotechnical properties.

Hybrid polymer composite materials. Part 1. Composition and properties

Modern notions about hybrid polymer composite materials are discussed. The classification of the hybrid materials relative to their structure is presented, types of the most frequently used binders (thermo- and thermosetting plastics) are considered. Dispersed and fibrous fillers are analyzed. Glass, basalt, carbon fibers, and based on them fabrics and rovings are discussed in detail. Advantages of hybrid polymer composite materials compared with composites consisting of one type fibers and binders are noted.

Investigation of the Influence of Linear Dimensions and Concentration of Carbon and Glass Fibers on the Properties of Polyetherimide

The effect of glass (GF) and carbon (CF) fibers of various linear sizes (0.2 and 3 mm) and concentrations on the properties of polyetherimide (PEI) has been studied. It is shown that the introduction of fibrous fillers leads to a decrease in the melt flow index, and to a greater extent in the case of fibers with a length of 3 mm. Also, it was found that both GF and CF lead to a decrease in toughness and an increase in the elastic-strength properties with a slight advantage of composites containing fibers of a length of 3 mm. In this case, GF composites have significantly higher properties. The study of heat resistance shows a slight decrease for composites with CF and the absence of influence of the filler for composites with HC, regardless of the size of the fibers.

Multifunctional polymer-based composite materials with weft-knitted carbon fibrous fillers

The production technology of reinforcement filler for new multifunctional polymer based composites with weft-knitted structure had been proposed. In such reinforcement filler high-strength carbon fibers (CFs) from PAN precursors (wefts) were laid in a knitted fabric as straight continuous yarns, so in such case these CFs were not twisted by knitting machine to form the loops. Various kinds of chemical and inorganic fibers can be used as base yarn in this case, in particular glass, aramid, carbon fibers from hydrate cellulose and etc. Properties of multifunctional polymer-based composite materials with weft-knitted fillers depend upon fiber composition, relative content of weft and base yarns, scheme filler stacking (1D, 2D and 3D composites). The electrical conductivity of weft-knitted fabrics shows the strong anisotropy along high-strength fibers in comparison with looped rows, depending on the direction of high-strength CFs (weft). Investigation of shielding properties of polymer based composites reinforced by carbon weft-knitted fabrics showed the possibility of using them as shielding materials with the ability to absorb electromagnetic radiation.

Equivalent inclusion approach and approximations for conductivity of isotropic matrix composites with sphere-like, platelet, and fibrous fillers

The construction starts from certain typical effective medium approximations for conductivity of idealistic isotropic matrix composites with randomly oriented inclusions of perfect spherical, platelet, and circular fiber forms, which obey Hashin–Shtrikman bounds over all the ranges of volume proportions of the component materials. Equivalent inclusion approach is then developed to account for possible diversions, such as non-idealistic geometric forms of the inhomogeneities, imperfect matrix-inclusion contacts, filler dispersions, and when the particular values of the fillers’ properties are unspecified, using available numerical or experimental reference conductivity data for particular composites. Illustrating applications involving experimental data from the literature show the usefulness of the approach.