Electrical property improvement of phenolic formaldehyde resin with graphene and ionic liquid

A silane coupling agent was used to modify the surface of expanded graphite (EG), which was subsequently used as a thermally conductive filler to fabricate diglycidylether of bisphenol-A (DGEBA)/EG composites with high thermal conductivity via hot blending and compression-curing processes. The surface characteristics of silane coupling agent-modified EG (Si@EG) were characterized by a variety of analytical techniques. The effects of the Si@EG content on the thermal conductivity, thermal stability, impact strength, and morphology of the DGEBA/Si@EG composites were investigated. The results revealed that the addition of 80 wt.% Si@EG increased the thermal conductivity of the composites from 0.17 to 10.56 W/m K, which was 61.1 times higher than that of pristine DGEBA. The initial decomposition temperature of the composite containing 80 wt.% Si@EG was 60.6 C higher than that of pristine DGEBA. The impact strength of the composites decreased from 2.0 to 0.87 kJ/m 2 when the Si@EG content increased from 0 to 80 wt.%. The scanning electron microscopy images of the fractured surfaces revealed that the EG sheets in the DGEBA matrix formed a continuous thermally conductive path at high Si@EG contents.

Section: Resultsmentioning

confidence: 99%

Improved thermal conductivity of epoxy resins using silane coupling agent‐modified expanded graphite

Jiang

Chu

Zhang

et al. 2022

“…The volume resistivity of the systems was measured at room temperature using a DC resistance tester (ZC‐90) according to the GB/T 24525‐2009 standard 24 . The sample size for this test was 4 × 80 × 80 mm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…Wang et al synthesized the ionic liquid 3-decyl-bis(1-vinyl-1H-imidazole-3-ium-bromide) and used it to improve the electrical conductivity of PF resin. 24 The electrical conductivity of the PF-based composites containing 15 wt% graphene increased from 5.6 Â 10 À5 to 9.2 Â 10 À4 S/cm with increasing ionic liquid from 0 to 5 wt%.…”

Section: Introductionmentioning

confidence: 95%

“…They showed that chloride‐anion‐containing systems exhibit high conductivities due to the presence of the polar and highly mobile chloride anion and oligomeric cations. Wang et al synthesized the ionic liquid 3‐decyl‐bis(1‐vinyl‐1 H ‐imidazole‐3‐ium‐bromide) and used it to improve the electrical conductivity of PF resin 24 . The electrical conductivity of the PF‐based composites containing 15 wt% graphene increased from 5.6 × 10 −5 to 9.2 × 10 −4 S/cm with increasing ionic liquid from 0 to 5 wt%.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of the ionic liquid 1,2‐dimethyl‐3‐butylimidazole bromide salt and its application in phenolic‐formaldehyde‐resin‐based conductive materials

Yao

Wang

Jin

et al. 2022

Self Cite

Herein, the ionic liquid 1,2-dimethyl-3-butylimidazole bromide salt ([DMBIm] Br) was synthesized and its chemical structure was characterized via Fourier transform infrared and 1 H nuclear magnetic resonance spectroscopies. Moreover, to improve the electrical property of the phenolic formaldehyde (PF) resin, PF/[DMBIm]Br systems were prepared via a melt blending and compression-curing process. Furthermore, the effect of [DMBIm]Br content on the thermal stabilities, mechanical properties, electrical properties, and morphologies of the systems was investigated. The thermal stability of the systems increased with [DMBIm]Br addition. The impact strength of the systems improved with increasing [DMBIm]Br content. Additionally, the volume resistance of the systems significantly decreased from 1.02 Â 10 9 to 1.64 Â 10 7 Ω with increasing [DMBIm]Br content from 0 to 1 wt%.

“…19 Figure 2 b displays the 1 H NMR spectrum of 3,5-ditert-butyl-4-hydroxybenzyl alcohol. 20 In detail, methacrylic acid (10 g), benzene (30 mL), hydroquinone (0.02 g), and p-toluenesulfonic acid (0.5 g) were added to a four-necked 100-mL flask equipped with a stir bar and then heated to 40 C under a nitrogen atmosphere. 3,5-di-tert-butyl-4-hydroxybenzyl alcohol (9.14 g) was added, and the mixture was heated to 80 C and reacted for 2 h. Then, a 5% Na 2 CO 3 solution was added and stirred to remove the polymerization inhibitor hydroquinone and unreacted methacrylic acid.…”

Section: Characterization Of 35-di-tert-butyl-4-hydroxybenzyl Alcoholmentioning

confidence: 99%

Synthesis of the reactive hindered phenol antioxidant 3,5‐di‐tert‐butyl‐4‐hydroxyphenyl methyl isobutylene ester and its application in ABS resin

Wang

Yao

Chen

2023

In this study, a reactive hindered phenol antioxidant, 3,5‐di‐tert‐butyl‐4‐hydroxyphenyl methyl isobutylene ester (DBHMIE), was synthesized and used to improve the antioxidant performance of ABS (acrylonitrile‐butadiene‐styrene terpolymer) resin. The chemical structure of DBHMIE was determined with Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance (NMR), and 13C NMR spectroscopy. Moreover, the effects of the DBHMIE content on the antioxidant capabilities, thermal stabilities, tensile strengths, impact strengths, and morphologies of the ABS/antioxidant systems were investigated. The results indicated that the oxidation induction temperatures of the systems increased from 229.7 to 245.4°C as the DBHMIE content was increased from 0 to 0.5 wt%. The 5% mass loss temperature of the system was increased from 338.4 to 347.8°C by the addition of 0.3 wt% DBHMIE. The impact strengths of the systems increased with increasing DBHMIE content up to 0.1 wt% and then decreased. The addition of DBHMIE did not significantly affect the tensile strength of the ABS resin. SEM images showed that the DBHMIE was uniformly distributed in the ABS resin at low DBHMIE contents and agglomerated at high DBHMIE contents.