Selective localization of multi‐walled carbon nanotubes in epoxy/polyetherimide system and properties of the conductive composites

Abstract

Multi-walled carbon nanotubes (MWCNTs) were introduced into the diglycidyl ether of a bisphenol A/polyetherimide (DGEBA/PEI) system. A co-continuous phase structure could be formed by the reaction-induced phase separation (RIPS). The MWCNTs localized selectively in PEI-rich phase which was predicted by theoretical calculations of the wetting coefficient (ω a ) and then confirmed both by optical microscopy and scanning electron microscopy. The thermomechanical properties of DGEBA/PEI/MWCNTs were studied by dynamic mechanical analysis. As the MWCNTs content increased from 0.5 to 1.0 wt %, storage modulus had a tendency of increasing monotonically from 2491 to 2948 MPa and the values of T g for epoxy-rich phase were almost unchanged at about 130 C. Subsequently, the result of electrical and thermal properties measurement for composites indicated that their volume resistivity decreased from 3.29 × 10 15 to 3.86 × 10 6 at 2.0 wt % MWCNTs and thermal conductivity were improved by 36.1% at the same time.

Enhanced Electromagnetic Interference Shielding Properties of Immiscible Polyblends with Selective Localization of Reduced Graphene Oxide Networks

“…FT-IR analysis was conducted on neat DGEBA, polyblend DP30, nanocomposites DR3 and DP30R3, respectively, and this spectral information is presented in Figure 5 . The peaks of neat DGEBA at ~2964, 2873, 1608, 1510, 912, and 830 cm −1 correspond to the C–H stretching of CH 2 , C–H stretching of aromatic and aliphatic, C=C stretching of aromatic rings, C–C stretching of aromatic, C–O stretching of oxirane group, and O–C–O stretching of oxirane group, respectively [ 36 , 37 ]. Meanwhile, the peaks at ~1245, 1183, and 1036 cm −1 belong to different aliphatic and aromatic C–H vibrations [ 38 ].…”

Comparative study of flexural and physical properties of graphite-filled immiscible polypropylene/epoxy and high-density polyethylene/epoxy blends

“…14 Several CPCs based on thermoplastic-thermoset blends filled with various conductive fillers have been reported. [15][16][17][18][19] These composites were usually investigated at low filler loadings and cannot meet the requirements for high conductivity applications. CPCs with higher filler contents have more prospects for such high conductivity applications but are prone to significant degradation in mechanical properties and some physical properties such as water absorption.…”

In situsynthesis of MWCNT-graft-polyimides: thermal stability, mechanical property and thermal conductivity

“…Hence, their applications are severely limited in industrial and electronic elds due to heat accumulation. [3][4][5] It is important to increase the thermal conductivity of polymers to enhance the thermal diffusion and then reduce the heat accumulation. A simple and feasible method for enhancing the thermal conductivity of polymers involves introducing highly thermally conductive llers (carbon nanotubes, 4,6,7 graphites, [8][9][10] boron nitrides, 11,12 aluminum nitrides, 13,14 and aluminum oxides 15 ) into polymers.…”