Cure behavior and thermal degradation mechanisms of epoxy and epoxy-cyanate resins

Régnier, Nicolas; Fayos, M.; Moreau, P.; Lafontaine, E.; Mortaigne, B.

doi:10.1002/(sici)1099-1581(199911)10:11<637::aid-pat915>3.0.co;2-7

Cited by 27 publications

(5 citation statements)

References 12 publications

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“…Triazine rings have been found to be temperature-insensitive; hence, they transform without releasing volatile matter. However, oxazolidinone structure changes upon heating because of the temperature-sensitive ether linkages present in them …”

Section: Thermal Propertiesmentioning

confidence: 99%

“…However, oxazolidinone structure changes upon heating because of the temperature-sensitive ether linkages present in them. 99 Su et al 100 observed that the thermal stability of cyanurate or triazine structures is much better than that of oxazolidinone structures as triazine rings have a 3-D cross-linked network, whereas oxazolidinone structures have a linear chain network. They also found out that the CTE of a CE−EP blend decreases with the increase in CE concentration.…”

Section: Thermal Propertiesmentioning

confidence: 99%

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Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Salunke

Sasidharan

Gopinathapanicker

et al. 2021

Ind. Eng. Chem. Res.

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The blending of conventionally available polymers has been extensively investigated over the past several decades and is considered as an alternative cost-effective method for the development of new polymers for specific applications. The blending of thermosets invites special attention as many of them can be used as matrices for composites for primary load-bearing applications. Cyanate ester and epoxy are two of the most popular thermoset polymers used across various industries such as aerospace, automobile, military, and civil sectors. Nevertheless, each of these resins has its limitations when used individually. Hence the blending of cyanate ester and epoxy is significant, for both commercial and academic interests. In this article, investigations on blends of cyanate ester and epoxy are reviewed based on their properties. Emphasis has been made on modifications of such blends resulting in improvements in mechanical, thermal, and other functional properties. Various applications employing these thermoset blends are discussed subsequently.

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Section: Thermal Propertiesmentioning

confidence: 99%

Section: Thermal Propertiesmentioning

confidence: 99%

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Salunke

Sasidharan

Gopinathapanicker

et al. 2021

Ind. Eng. Chem. Res.

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“…One driving force causing the relaxation is the stress due to the increased surface area, the magnitude of which increases with the radius of curvature of the scratch. 15,16 Therefore, the deepest and sharpest scratch, also with the biggest radius of curvature, recovered fastest.…”

Section: Scratchesmentioning

confidence: 99%

Thermal-induced recovery of small deformations and degradation defects on epoxy coating surface

Shi

Croll

2009

J Coat Technol Res

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Surface defects, which are dependent on the surface properties, determine the appearance, toughness, and other properties of coatings; thus, changes to the morphology of a damaged epoxy coating surface were investigated on annealing. Changes in mechanically produced indentations and scratches with annealing indicate a surface transition temperature about 10 degree lower than the measured bulk glass transition temperature (T g ). Polymer molecules at a free surface, even in a crosslinked coating, may have higher mobility, and thus allow different relaxation activity from the bulk material. The eventual extent of deformation is a function of the annealing temperature and time. Results showed that the deformation profile diminished, driven by viscoelastic deformation and surface energy; the effect of structural relaxation will be further studied. When the surface features were generated by photodegradation, the roughness increased initially when temperature was increased, possibly due to phase coarsening, and then the roughness diminished during extended annealing.

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“…13 However, like most other thermosetting resins, the biggest shortcoming of pure CE resin is its brittleness. To improve the fracture toughness, they have been made through transforming the basic rigid triazine structure into a flexible structure by blending it with embedding thermoplastics and flexible rubbers, 17,18 or through copolymerization with other thermosetting resins like EP, [19][20][21] bismaleimides, 22,23 and so on. Among the above-mentioned procedures, the modification of CE resin by EP resin has been proved to be an effective route, 24,25 which not only effectively improves the toughness and humidity absorption 26 but also reduces the cost and high curing temperature of CE.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of cyanate/epoxy foam

Fan

Tian

Chen

et al. 2015

High Performance Polymers

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A new type of cyanate (CE)/epoxy (EP) foam with bisphenol-A dicyanate ester prepolymer and diglycidyl ether of bisphenol-A (BADCy/DGEBA) has been successfully prepared through a two-step process. The structure and properties of CE/EP foam were studied. The results reveal that the CE/EP foams, with relatively uniform cell structure, were composed of closed cells as confirmed by scanning electron microscopy. The compressive strength increased from 0.507 MPa to 3.021 MPa, and the compressive modulus (E) increased from 15 MPa to 123 MPa as the density increased from 0.103 g cm À3 to 0.305 g cm À3. Dynamic mechanical analysis revealed that the CE/EP foams possessed a high glass transition temperature (T g ) (203 C) and that density had only a little impact on T g . Moreover, the excellent thermal stability presented with the onset of weight loss taken at 5% value was above 320 C, and the residual weight of the foam was more than 21.6% at 800 C. With increase in the density of CE/EP foams, the dielectric constants (") gradually decreased. For the foam with density of ¼ 0.162 g cm À3 , the value of " was as low as 2.28 at the frequency of 10 kHz.

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Cure behavior and thermal degradation mechanisms of epoxy and epoxy-cyanate resins

Cited by 27 publications

References 12 publications

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Thermal-induced recovery of small deformations and degradation defects on epoxy coating surface

Preparation and characterization of cyanate/epoxy foam

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