Simultaneous enhancements in toughness, tensile strength, and thermal properties of epoxy-anhydride thermosets with a carboxyl-terminated hyperbranched polyester

Fei, Xiaoma; Wei, Wei; Tang, Yuyao; Zhu, Ye; Luo, Jing; Chen, Mingqing; Liu, Xiaoya

doi:10.1016/j.eurpolymj.2017.03.022

Cited by 67 publications

(31 citation statements)

References 32 publications

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“…As shown in Fig. (b), the curing process of neat epoxy reveals a typical autocatalytic mechanism . Despite that the hydroxyl groups could accelerate the curing reaction, the values of E a for the composites are still higher than that for neat epoxy during earlier stage.…”

Section: Resultsmentioning

confidence: 99%

“…Epoxy resin is one of the most widely used thermosetting resins in industry with outstanding mechanical and thermal properties and chemical resistance owing to its highly crosslinked three‐dimensional network . However, when used in many electronic packaging applications, the intrinsic low thermal conductivity of epoxy thermosets presents a major drawback .…”

Section: Introductionmentioning

confidence: 99%

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Noncovalent functionalization of carbon nanotubes using branched random copolymer for improvement of thermal conductivity and mechanical properties of epoxy thermosets

Tang

Zhao

Fei³

et al. 2018

Polymer International

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noncovalent functionalization of carbon nanotubes using branched random copolymer for improvement of thermal conductivity and mechanical properties of epoxy thermosets

Tang

Zhao

Fei³

et al. 2018

Polymer International

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“…The synthesis of functional monomer (AB 2 + AB 3 ) was following the procedure reported by Fei et al ; 26 mL of DETA was added into a 250‐mL three‐necked round‐bottomed flask with 25 mL of methanol in an ice‐water bath. The mixture was homogenized under stirring at 500 rpm for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Effect of Pickering emulsion on the mechanical performances and fracture toughness of epoxy composites

2019

Polymers for Advanced Techs

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The improvement of mechanical properties and toughness of nanoparticles for epoxy composites was mostly dependent on the disperse state of nanoparticles in epoxy matrices. When the content of nanoparticles was higher than a threshold value, it was easy to aggregate and then affect the improvement effect. Pickering emulsion was prepared using SiO2 nanoparticles as emulsifier and functional monomer as oil phase. The influence of Pickering emulsion on the curing process was investigated. The effect of Pickering emulsion on the mechanical properties, toughness, and glass transition temperature (Tg) was studied. Impact and tensile fracture surface were observed by scanning electron microscopy (SEM). Results from differential scanning calorimeter (DSC), tensile, impact, and fracture toughness tests are provided. The results indicated that the introduction of Pickering emulsion can eliminate the residual stress and accelerate curing reaction. Epoxy composites were capable of increasing tensile strength by up to 29.9%, impact strength of three‐fold, fracture toughness of 35%, and Tg of 20.7°C in comparison with the reference sample. SEM images showed that SiO2 nanoparticles exhibit a good dispersion in epoxy matrix. The increases in mechanical properties, toughness, and Tg of epoxy composites were attributed to the “Second Phase Toughness” mechanism.

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“…Demanding design specifications and performance requirements, however, continue to place increased demands upon the matrix resin for next generation composite materials. A lack of toughness or distortional behavior of the matrix in particular, is driving much of the current research into more ductile and impact resistant network polymers . Despite being primarily controlled by crosslink density or the chemical structure of the network, additive approaches to improving toughness are common, including ductile and rigid inclusions, interlayers, and nanoadditives to name a few.…”

Section: Introductionmentioning

confidence: 99%

“…Despite being primarily controlled by crosslink density or the chemical structure of the network, additive approaches to improving toughness are common, including ductile and rigid inclusions, interlayers, and nanoadditives to name a few. The primary goal of all these strategies, however, remains the enhancement of toughness or distortional behavior, without compromising other desirable properties such as modulus, strength, or processability …”

Section: Introductionmentioning

confidence: 99%

Synthesis of tri‐aryl ketone amine isomers and their cure with epoxy resins

Reyes

Dao

Vogel

et al. 2019

Polymers for Advanced Techs

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Isomeric tri‐aryl ketone amines, 1,3‐bis(3‐aminobenzoyl)benzene (133 BABB), 1,3‐bis(4‐aminobenzoyl)benzene (134 BABB), and 1,4‐bis(4‐aminobenzoyl)benzene (144 BABB) are synthesized and cured with diglycidyl ether of bisphenol A and diglycidyl ether of bisphenol F in this work. Differential scanning calorimetry and near‐infrared spectroscopy reveal higher rate constants and enhanced secondary amine conversion with increasing para substitution attributed to resonance effects and the electron withdrawing nature of the carbonyl linkages. Glass transition temperatures increase from 133 BABB to 134 BABB, but decrease modestly for the 144 BABB hardener. With increasing para substitution, the flexural modulus and strength both decrease while the strain to failure increases but all BABB amines displaying higher mechanical properties than the corresponding 4,4‐diaminodiphenyl sulfone (44 DDS) networks. The thermal stability of the BABB networks is found to be modestly lower than 44 DDS, but char yields are significantly higher. Changes in thermal and mechanical properties are described in terms of molecular structure and equilibrium packing density.

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Simultaneous enhancements in toughness, tensile strength, and thermal properties of epoxy-anhydride thermosets with a carboxyl-terminated hyperbranched polyester

Cited by 67 publications

References 32 publications

Noncovalent functionalization of carbon nanotubes using branched random copolymer for improvement of thermal conductivity and mechanical properties of epoxy thermosets

Noncovalent functionalization of carbon nanotubes using branched random copolymer for improvement of thermal conductivity and mechanical properties of epoxy thermosets

Effect of Pickering emulsion on the mechanical performances and fracture toughness of epoxy composites

Synthesis of tri‐aryl ketone amine isomers and their cure with epoxy resins

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