Effect of multiwalled carbon nanotubes on the crystallization and dielectric properties of BP-PEN nanocomposites

Abstract

In this work, polymer-based nanocomposite films formed from biphenol poly(arylene ether nitrile) (BP-PEN) and multiwalled carbon nanotubes (MWCNTs) were successfully prepared by the solution casting method combined with continuous ultrasonic dispersion technology. The micromorphology, thermal, mechanical and dielectric properties of the nanocomposite films were investigated in detail. Non-isothermal crystallization behavior studies indicate that the presence of MWCNTs enhances the crystallization of BP-PEN in the nanocomposites, which is consistent with the XRD analysis. Most importantly, it could be observed that the film containing 0.8 wt% MWCNTs reached the maximum crystallinity. Although, incorporation of MWCNTs did not obviously increase the mechanical of the films, all the nanocomposite films still exhibited excellent mechanical strength. The SEM micrographs of the nanocomposite films showed that the MWCNTs were uniformly coated by BP-PEN crystals, and indicating significantly improved nucleation ability of MWCNTs for polymer crystallization.

Polymer-based composites with improved energy density and dielectric constants by monoaxial hot-stretching for organic film capacitor applications

“…• , which is in accordance with previous reports 13 .In contrast, the diffraction pattern of the stretched specimens showed a sharper and stronger peak at about 2ɵ = 18 • . This indicated that some of the polymer crystal structures disappeared or reduced after hot stretch process and other crystal structures become more stable and perfect.…”

“…Polyarylene ether nitriles(PEN), as a special thermoplastic engineering material, possesses various outstanding properties, including excellent mechanical properties, high thermal stability, radiation resistance and chemical inertia nature, etc [9][10][11] . These characteristics make it a good candidate to be used in industrial, automotive and outer space fields encountered with high temperature or high radiation exposure [12][13][14] . Many studies have reported that MWCNTs can be well dispersed in the polymer matrix and act as a nucleation site for crystal polymer [15][16][17][18][19] .…”

Novel polyarylene ether nitrile nanofibrous mats with fluorescence and controllable surface morphology

“…As depicted in Scheme 1, the PEN copolymers with pendant carboxyl groups were synthesized via the nucleophilic aromatic substitution polymerization of 2, 6-dichlorobenzonitrile with different ratios of 4, 4-Bis(4-hydroxyphenyl)valeric acid and biphenol in the presence of K 2 CO 3 , according to the procedure described in the literature [9]. A series of PEN-COOH copolymers with different contents of carboxyl groups were obtained by varying the molar ratios of 4, 4-bis(4-hydroxyphenyl)valeric acid to biphenol.…”

“…Polyarylene ether nitrile (PEN) is a class of high performance engineering thermoplastics due to its outstanding mechanical properties, high thermal stability and excellent chemical resistance accompanying with good processibility and film-forming ability [7][8][9]. Moreover, chemical modifications of such polymer may lead to further innovative applications.…”

Polyarylene Ether Nitrile-Based High-k Composites for Dielectric Applications

“…Due to these charming properties, CNTs have been widely adopted in substituting or replenishing traditional nanofillers to prepare composites with different functions. Zheng et al [94] prepared composite films by using 4,4 ′ -dihydroxybiphenyl-based PEN as the organic substrate and multiwalled carbon nanotubes (MWCNTs) as additives. The permittivity of the obtained mixture increases from 4.3 to 6.1 (1 kHz) with the content of MWCNT fillers increases from 0 wt% to 3 wt%, exhibiting little frequency dependence with the incorporation of MWCNTs.…”