Effects of ball milling dispersion of nano-SiOx particles on impact strength and crystallization behavior of nano-SiOx–poly(phenylene sulfide) nanocomposites

C60 as fine fillers to improve poly(phenylene sulfide) electrical conductivity and mechanical property

Electrical conductive poly(phenylene sulfide) (PPS)/fullerene (C₆₀) composites were prepared by 1-chlornaphthalene blending method, and the interface effects of C₆₀ and PPS on PPS/C₆₀ properties were characterized. C₆₀ is an excellent nanofiller for PPS, and 2 wt% PPS/C₆₀ composite displayed the optimal conductivity which achieved 1.67 × 10⁻² S/cm. However, when C₆₀ concentration reached 2 wt%, the breaking strength and tensile modulus of PPS/C₆₀ fiber achieved maximum 290 MPa and 605 MPa, and those values were 7.72 and 11.2 times as that of pure PPS. The excellent conductive and mechanical properties of PPS/C₆₀ were attributed to the heterogeneous nucleation of C₆₀ during PPS crystallization, formation of a large number of covalent bond by main C₆₀-thiol adducts and minor C₆₀-ArCl alkylation between C₆₀ outer surface and PPS matrix. At same time, PPS/C₆₀ thermal properties were also investigated.

Effects of hydrogen bonding between MWCNT and PPS on the properties of PPS/MWCNT composites

PPS/MWCNT composites were prepared from PPS and MWCNT-OH or MWCNT-COOH by the 1-chloronaphthalene blending method, and the effects of noncovalent interaction between PPS and fillers on the properties of the composites were studied.

Surface modification of titanium hydride with epoxy resin by ultrasonic wave-assisted ball milling

Surface modification of titanium hydride (TiH2) with epoxy resin was carried out by ultrasonic wave-assisted ball milling. The product was characterized by X-ray diffraction, transmission electron microscopy, thermogravimetry and Fourier transform infrared spectroscopy. The sedimentation test was conducted to investigate the compatibility of TiH2 nanoparticles with epoxy resin. The results show that epoxy resin is grafted on the nanoparticles’ surface after the ultrasonic wave-assisted ball milling process, which improves the compatibility of TiH2 nanoparticles with epoxy resin. The different results of ultrasonic wave irradiation, ball milling (without ultrasonic wave assistance) and ultrasonic wave-assisted ball milling indicate that the coupling effect of ultrasonic wave and mechanical force plays an important role in the grafting process. In addition, the anticorrosion property of epoxy resin coating containing modified nanoparticles was investigated.

Exfoliated graphite as a filler to improve poly(phenylene sulfide) electrical conductivity and mechanical properties

Electrical conductive poly(phenylene sulfide) (PPS)/exfoliated graphite (EG) composites were prepared by a 1-chlornaphthalene blending method, and the interface effects of EG and PPS on PPS/EG properties were characterized.

Enhanced dielectric performance of BaTiO3/PVDF composites prepared by modified process for energy storage applications

Ceramic-polymer composites have attracted extensive attention in electrical applications due to their high permittivity and low loss. In this work, we report the studies on the preparation and properties of barium titanate (BT)/ poly(vinylidenefluoride) (PVDF) composite thin films. The composite film was prepared by a modified process rather than the conventional method. The modified process adopted ballmilling technique instead of the stirring method to disperse BT nanoparticles into PVDF solution. Scanning electron microscopy images of the obtained composites show that the BT nanoparticles are incorporated into the PVDF network and are well dispersed in the matrix. When the BT volume fraction is 30%, the permittivity and breakdown strength of the composites reach their optimal values and the energy density reaches maximum value (5.3 J/cm3), an increase of 80% compared with that of the composites prepared using the stirring method. Another modification is the use of acetone and butanone mixed solution instead of N,N-dimethylformamide to dissolve the PVDF, which is beneficial to form pure α-PVDF composite films on the polyethylene terephthalate substrate by tape casting. The composites prepared by the modified process, with high permittivity and significantly enhanced breakdown strength, are useful candidates for energy storage applications.