Study on effects of short glass fiber reinforcement on the mechanical and thermal properties of PC/ABS composites

Abstract

This article mainly investigated the length distributions of the alkali-free short glass fibers in specimens and their effect on the mechanical and thermal properties of the composites. The results show that the initial length, addition level and feed way of the fibers have obvious effects on the length distributions of fibers in specimens, and thereby the mechanical and thermal properties of the composites. The main-direction feed way has an intense shear action on the fibers in specimens. With the increase of the fiber content, the reinforcing effect of fibers on the tensile strength, flexural strength and flexural modulus of the composites is increased, while the impact strength is decreased first and then tends to be stable, and the strength factor (F) of the tensile strength to weld line is significantly reduced. The longer the fiber lengths in specimens are, the more obvious the reinforcing and toughening effects are. To some extent, with the increase of the fiber content, the storage modulus (E 0 ) and loss modulus (E 00 ) of the specimens are increased, but the loss factor (Tan d) is reduced. The effect of the fiber initial lengths on the heat-degradation of composites is smaller than that of the fiber content. Meanwhile, adding fibers can improve the thermal stability of the composites, and this law is also confirmed by the heat deflection temperature (HDT) test.The blends dominated mainly by PC (polycarbonate) and ABS (acrylonitrile-butadiene-styrene) are important engineering materials, which have good molding flow properties, high HDT and thermal stability, excellent comprehensive mechanical properties and a certain flame retardancy. PC/ABS blends have been widely applied in automobile, appliance, electrical apparatus, defense industry and others. 11-17 PC/ABS melt presents a pseudo-plastic flow characteristic of the shear-thinning and their composites show a strong nonlinear behavior under the impact and compression. 17,18 Meanwhile, although there is certain compatibility between PC and ABS, the further modification of compatibility is still needed to obtain higher performance of PC/ABS blends. The related studies have found that some additives (EVA-g-MAH, SMA, etc.) can improve the compatibility between PC and ABS, thereby improve the impact performance and elongation of materials. 18,19 The researches from Din and Hashemi 2 and Hashemi and coworkers. 20-23 showed that when the reinforcing fibers are added into composites, the tensile strength, flexural strength, tensile modulus, and flexural modulus of the plastic parts are improved at different degrees, and elongation, work of fracture are decreased. Meanwhile, the weld line strength factor will be

Preparation, microstructures, and properties of long-glass-fiber-reinforced thermoplastic composites based on polycarbonate/poly(butylene terephthalate) alloys

“…However, for most of the composites with short reinforcing fibers, the impact strength only shows an improvement by 10-20% in comparison to their pure resins due to the distribution of the residual in the range of 0.1-0.5 mm as reported by the corresponding literature. [40][41][42]47,48 The high levels of impact strength exhibited by the LFT composites are often attributed to energy dissipating mechanisms of fiber debonding, pullout, and fracture, which have been discussed by many researchers. [18][19][20][21] The impact energy dissipation is also generally influenced by several factors including matrix fraction, fiber debonding, friction between the interfaces of matrix and fibers, fiber pullout, and fiber breakage.…”

Expandable graphite's versatility and synergy with carbon black and ammonium polyphosphate in improving antistatic and fire‐retardant properties of wood flour/polypropylene composites

“…WPCs fire retardancy is critical, because most WPCs are quite highly flammable. Although domestic and foreign scholars have conducted a wealth of research work on the antistatic properties of virgin plastic [4][5][6][7][8][9] and the fire retardancy of WPCs [10][11][12][13][14][15][16][17][18][19][20], relatively limited academic research exists on WPCs antistatic properties combined with fire retardancy.…”

Properties and Structure of Fiber-Reinforced Injection-Molded Part

“…With the increase of each reinforcing agent, the overall impact toughness and tensile strength increased in the first place and decreased afterwards, and the reinforcing function of carbon fibers was more significant. Wang et al [4] found that the mechanical properties of composite was dependent on the fiber content in the composite: with the increase of fiber content, the tensile strength and flexural strength increased while the impact strength firstly decreased and then maintained constant. Nayak et al [5] reported that when fiber content exceeded a critical value, the fiber in composite material products would agglomerate, resulting in voids inside the materials.…”