Comparative study on the mechanical and thermal properties of polycarbonate composites reinforced by KH570/SA/SDBS modified wollastonite fibers

Abstract

In order to increase the applicability of wollastonite (Wo) in polycarbonate (PC) polymer, surface modification of Wo was carried out using different modifiers containing silane coupling agent KH570, stearic acid (SA), and sodium dodecylbenzene sulfonate. The physical, physic-chemical, and application properties of modified Wo were evaluated. Results showed that KH570 modified Wo had narrower particle size distribution, higher absolute zeta potential and were more evenly distributed. Scanning electron microscope study confirmed their changes in morphology and aspect ratio during the modification process. The tensile strength of Wo/PC composites, in which KH570-modified Wo was used were superior to those in which original Wo or other modifiers modified samples were used. The maximum tensile strength of 65 ± 1 MPa was obtained by adding 15 wt% KH570-modified Wo. Thermal analysis indicated that adding Wo to the polycarbonate increased the residue content but decreased the thermal decomposition temperature and glass transition temperature slightly, regardless of unmodified or modified Wo. These results indicated that the well-modified Wo mineral had the potential to replace expensive carbon and glass fibers as fillers in polycarbonate products.

Ultra‐fast curing of benzoxazine with surface modified fly ash‐assisted microwave: Achieving excellent comprehensive performances

“…The surface‐modified FA was examined as shown in Figure 2. It can be observed that a new peak at 1740 cm −1 , corresponding to the stretching vibration of CO in COO, 44,45 was present in KH570‐SA‐F but not in FA, indicating the successful surface modification for FA. Additionally, there were no differences observed at the peaks of 3450 and 1660 cm −1 in KH570‐SA‐F and FA, 46,47 which correspond to the stretching vibration and bending vibration of the free hydroxyl group.…”

Effects of stearic acid on the tensile properties of ultrahigh molecular weight polyethylene fibers

“…Angel et al 28 used SA as a lubricant for favoring the interaction of polypropylene with the bentonite and decreasing the viscosity of the compounds, as well as polypropylene/calcium carbonate compounds 29 . Chen et al 30 used SA to enhance the applicability of wollastonite in polycarbonate. However, there have been no reports on the application of SA in the preparation of UHMWPE fibers by gel spinning.…”

Effects of in‐situ cryogenic testing temperature and ex‐situ cryogenic aging on the mechanical performance of glass fiber reinforced polymer composites with waste short carbon fibers as secondary reinforcements

“…[1][2][3][4][5][6][7] FRP composites are suitable for adequately transporting and storing cryogenic fluids. [8,9] The integrity and durability of composite materials depend upon humidity, [10][11][12][13] high [14][15][16][17][18][19] and low [20,21] temperatures, and cryogenic [22][23][24] conditions. Low-temperature fluids, such as liquid methane (À161 C), liquid nitrogen (À196 C), and liquid hydrogen (À252 C), are frequently kept in compacted form in cryogenic storage tanks.…”