Curing and thermal behavior of epoxy resins of hexafluoro - bisphenol –A and bisphenol-A

Kiran, Vaishnav; Gaur, Bharti

doi:10.1590/0104-1428.2041

Cited by 15 publications

(7 citation statements)

References 20 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a simple alternative to the use of an Arrhenius kinetic equation to predict the degree of irreversible matrix decomposition ( D ) in a carbon/epoxy composite, the amount of matrix decomposition can be assumed to instantly increase over the range of matrix decomposition temperatures (i.e., 300–500°C or 300–600°C ). This can be expressed mathematically as

D = {(\frac{T - T_{normali}}{T_{normalF} - T_{normali}})}^{m}

for T i ≤ T ≤ T F…”

Section: Theoretical Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

Temperature‐dependent thermal decomposition of carbon/epoxy laminates subjected to simulated lightning currents

et al. 2017

View full text Add to dashboard Cite

A finite element (FE) parametric study was performed to characterize the temperature‐dependence of irreversible thermal decomposition of AS4/3506 carbon/epoxy composites laminates subjected to simulated lightning currents of 40 kA or less during 30 μs. In this study, irreversible matrix thermal decomposition caused by simulated lightning currents was considered as a primary form of lightning damage. FE simulations were conducted to compare the size and the intensity of matrix thermal decomposition based on the fully coupled spatially and temporally varying temperature/material model that we developed and recently reported (Lee et al., Polym. Compos., (in press)). Two commonly used matrix decomposition temperature ranges of 300–500°C and 300–600°C were considered to predict the extent of matrix decomposition. Matrix thermal decomposition was assumed to vary either linearly or quadratically within these given temperature ranges. The predicted size and intensity of matrix thermal decomposition around the lightning attachment point strongly depended on both the assumed thermal damage variation (i.e., linear or quadratic) and matrix decomposition temperature ranges. The shape and size of the damaged matrix domains predicted using the linear damage variation between 300 and 500°C agreed fairly well with experimentally measured results available in the literature. Use of the linear damage variation between 300 and 600°C and the quadratic damage variation over both considered temperature ranges somewhat underestimated thermal damage development compared to the few experimental lightning damage studies in the literature. POLYM. COMPOS., 39:E2185–E2198, 2018. © 2017 Society of Plastics Engineers

show abstract

D = {(\frac{T - T_{normali}}{T_{normalF} - T_{normali}})}^{m}

for T i ≤ T ≤ T F…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Four unique matrix thermal decomposition profiles were compared herein. These include linear and quadratic thermal damage variations occurring within two temperature ranges established in the literature (i.e., 300–500°C and 300–600°C). These were used to predict the extent of matrix thermal decomposition in the laminates.…”

Section: Introductionmentioning

confidence: 99%

Temperature‐dependent thermal decomposition of carbon/epoxy laminates subjected to simulated lightning currents

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In the case of IAMDK, the electron releasing methyl group enhances the basicity of the amine group and consequently increasing its reactivity. [ 35 ] These results were compared to a previous study [ 36 ] where epoxy resins were cured with a commercial aromatic amine curing agents DDM and DDS and the synthesized imidoamines were found to be more reactive than the commercial curing agents as the DDM and DDS show much higher onset and peak temperatures. The reason for the enhanced reactivity in the case of rosin‐based imidoamine curing agents may be attributed to the presence of dirosin moiety that shows electron‐donating effect and increases the nucleophilicity of amine groups.…”

Section: Resultsmentioning

confidence: 99%

Thermo‐mechanical properties of rosin‐modified o‐cresol novolac epoxy thermosets comprising rosin‐based imidoamine curing agents

Thakur

Jaswal

Gaur

et al. 2020

Polymer Engineering & Sci

Self Cite

View full text Add to dashboard Cite

Rosin‐modified o‐cresol novolac epoxy resin (AEOCN) was synthesized by condensation of rosin acid with o‐cresol formaldehyde novolac resin (AOCN). The AEOCN resin was further epoxidized using epichlorohydrin and sodium hydroxide. Rosin‐based imidoamine curing agents (IAMDK, IASDK, and IAEDK) were also prepared by reacting dimaleopimaryl ketone (DMPK), a dimerized rosin product with aromatic diamines. The chemical structures of all synthesized products were confirmed by FTIR, 1H‐NMR, 13C‐NMR, and DEPT‐135° spectroscopic techniques. The curing process of rosin‐modified epoxy cured with imidoamine crosslinkers was studied using differential scanning calorimetry (DSC) and the results were compared to o‐cresol novolac epoxy resin (EOCN) and some previously reported commercial‐based systems. The thermal and mechanical properties of the cured epoxy thermosets were determined using a thermogravimetric analyzer (TGA) and a universal testing machine (UTM), respectively. The chemical resistance analysis was carried out by immersing cured epoxy coated panels in 1M NaOH, 1MHCl, and 1M NaCl solutions. The results were evaluated in terms of % weight loss method and the morphological changes that appeared due to chemical exposure were also investigated via scanning electron microscopy (SEM). This study presents the economical synthetic approach towards high‐performance bio‐based epoxy coating materials impending to replace some of the petrochemical compounds in coating industries.

show abstract

“…In particular, aromatic amines as curing agents offer advantages of excellent chemical resistance, high-temperature stability, and good mechanical strength. 16 Various aromatic diamines have been used to cure the most commonly used epoxy resin, diglycidyl ether of bisphenol-A (DGEBA). 17,18 Thermosetting resins can also be made more flame resistant by using imide compounds end-capped with aromatic amines.…”

Section: Introductionmentioning

confidence: 99%

Curing and thermal comparative study of rosin epoxy thermosets with bio-based imidoamines and commercial curing agents

Thakur

Gaur

2022

Journal of Elastomers & Plastics

Self Cite

View full text Add to dashboard Cite

This paper includes the curing of previously synthesized multifunctional bio-based epoxy resins (PEMPAE/TMPAE) with rosin-based imidoamine curing agents (IAMDK/IASDK/IAEDK) which are nucleophilic addition reaction products of diamino diphenyl ether (DDE) and dimaleopimaryl ketone (DMPK), a dehydrodecarboxylated derivative of MPA. Curing dynamics of rosin-based epoxy resins (PEMPAE/TMPAE) with rosin-based imidoamine curing agents (IAMDK/IASDK/IAEDK) were evaluated using differential scanning calorimetry. For comparison, the bio-based epoxy resins were also cured with rosin derivative dimaleopimaryl ketone (DMPK) and commercial-based diamino diphenyl ether (DDE). The universal testing machine and thermogravimetric analyzer) were used to measure the mechanical properties and thermal stability of the cured epoxy samples. The samples’ chemical resistance was assessed by calculating the weight loss in percent after they were submerged in solutions of NaOH, HCl, and NaCl. We also used scanning electron microscopy (SEM) to examine the morphological changes. Rosin-based epoxy cured with imidoamine curing agents outperformed the commercial epoxy in terms of performance.

show abstract

Curing and thermal behavior of epoxy resins of hexafluoro - bisphenol –A and bisphenol-A

Cited by 15 publications

References 20 publications

Temperature‐dependent thermal decomposition of carbon/epoxy laminates subjected to simulated lightning currents

Temperature‐dependent thermal decomposition of carbon/epoxy laminates subjected to simulated lightning currents

Thermo‐mechanical properties of rosin‐modified o‐cresol novolac epoxy thermosets comprising rosin‐based imidoamine curing agents

Curing and thermal comparative study of rosin epoxy thermosets with bio-based imidoamines and commercial curing agents

Contact Info

Product

Resources

About