Effects of Covalent Functionalization of MWCNTs on the Thermal Properties and Non-Isothermal Crystallization Behaviors of PPS Composites

Abstract

Abstract:In this study, a PPS/MWCNTs composite was prepared with poly(phenylene sulfide) (PPS), as well as pristine and covalent functionalized multi-walled carbon nanotubes (MWCNTs) via melt-blending techniques. Moreover, the dispersion of the MWCNTs on the PPS matrix was improved by covalent functionalization as can be seen from a Field-Emission Scanning Electron Microscope (FE-SEM) images. The thermal properties of the PPS/MWCNTs composites were characterized using a thermal conductivity analyzer, and a differential scanning calorimeter (DSC). To analyze the crystallization behavior of polymers under conditions similar with those in industry, the non-isothermal crystallization behaviors of the PPS/MWCNTs composites were confirmed using various kinetic equations, such as the modified Avrami equation and Avrami-Ozawa combined equation. The crystallization rate of PPS/1 wt % pristine MWCNTs composite (PPSP1) was faster because of the intrinsic nucleation effect of the MWCNTs. However, the crystallization rates of the composites containing covalently-functionalized MWCNTs were slower than PPSP1 because of the destruction of the MWCNTs graphitic structure via covalent functionalization. Furthermore, the activation energies calculated by Kissinger's method were consistently decreased by covalent functionalization.

Enhanced Oxidation Resistance of Polyphenylene Sulfide Composites Based on Montmorillonite Modified by Benzimidazolium Salt

“…The strong absorption peak at 807 cm −1 is the characteristic peak of the ρ-disubstituted benzene ring. Moreover, the peak at 1178 cm −1 is attributed to the stretching vibration absorption of –SO 2 –, and 1075 cm −1 is the stretching vibration absorption of –SO– [3]. The existence of –SO 2 – and –SO– in pure PPS resin can be explained by the low bond energy of the C–S bond, which is easily oxidized during the synthesis, drying, and storage process of PPS resin.…”

“…Polyphenylene sulfide (PPS) is an attractive high-performance thermoplastic polymer which possesses high thermal stability, good mechanical properties and excellent fire resistance [1,2,3,4]. Due to its outstanding performance, PPS has been widely applied in the field of high temperature filtration [5,6].…”

Thermal Conductivity of Aluminosilicate- and Aluminum Oxide-Filled Thermosets for Injection Molding: Effect of Filler Content, Filler Size and Filler Geometry

“…Fillers with high thermal conductivity used for thermoplastic composites, e.g., multi-wall carbon nanotubes (MWCNTs), carbon fibers, and coppers, could effectively improve the thermal conductivity of polymer composites [9,10,11,12]. While fillers with high electrical resistance such as boron nitride (BN) and aluminium nitride (AlN) have been already introduced to polymers [13,14], electrical isolation is one of the necessary properties of packaging material for those with high thermal conductivity such as electronic devices.…”

Preparation and characterization of polyphenylene sulfide/graphene nanoplatelets composite fibers with enhanced oxidation resistance

“…It can also be attributed that the addition of BGN results in the heterogeneous nucleation crystallization of PPS, which can accelerate the crystallization rate and improve the crystallinity of PPS. 32 –34 During the process of melt spinning, the PPS molecular chains are basically amorphous when the molten PPS is ejected from the spinneret to the drafting zone. During the drafting zone, the PPS molecular chains start to align and crystallize under the effect of stretching force and thermal energy.…”