One-pot synthesis of tetramethyl biphenyl backboned hyperbranched epoxy resin as an efficient toughening modifier for two epoxy curing systems

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

doi:10.1007/s00289-018-2269-2

Cited by 9 publications

(6 citation statements)

References 34 publications

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“…PDEP epoxy groups participating in the reaction caused an uneven cross-linking network. Formation of the microscopic structure generated stress when yielding to the filar strips which absorb the impact energy; in addition, there are some unclosed hydroxyl branch chains in the blending system, which plays a synergistic toughening effect. − …”

Section: Resultsmentioning

confidence: 99%

Efficient Toughening of DGEBA with a Bio-Based Protocatechuic Acid Derivative

et al. 2023

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In this work, a bio-based epoxy resin, protocatechuic acid diester epoxy resin, (PDEP), was synthesized using protocatechuic acid. The structure and properties of PDEP have been characterized by 1 H NMR, 13 C NMR, and Fourier transform infrared. After different contents of PDEP were added to diglycidyl ether of bisphenol A (DGEBA), the modified epoxy resins were cured by 4,4′-diaminodiphenylmethane (DDM). With the addition of a flexible long-chain bio-based monomer to improve toughness, the impact strength was 50 kJ•m −2 with only 5.0 wt % PDEP; compared with pure DGEBA, the impact strength was 27 kJ•m −2 . Further, an increase in T g should be confirmed from the mechanical cross-linking density and rigidity group content. The single T g proved the homogeneous phase structure of the PDEP-cured resin. Morphology exhibiting the ductile fracture of the cured resin was confirmed by scanning electron microscopy. Overall, this work demonstrates the utilization of renewable protocatechuic acid as an effective modifier for epoxy resin, which reflects its potential application.

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Section: Resultsmentioning

confidence: 99%

Efficient Toughening of DGEBA with a Bio-Based Protocatechuic Acid Derivative

et al. 2023

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“…Epoxy resins are widely used as matrices in fiber-reinforced composite materials due to their good processability, adhesion, low shrinkage, high chemical stability, and low water absorption. − Epoxy resins reinforced by fibers have a series of advantages, such as lightweight, high specific strength, high specific modulus, and so on. − However, after curing, the epoxy resin forms a cross-linked network structure with high brittleness, poor impact resistance, and insufficient crack propagation resistance. − These shortcomings not only affect the impact properties and fracture toughness of fiber-reinforced epoxy resin matrix composites but also restrict the application of epoxy resin matrix composites . The common methods of toughening epoxy resin include nanoparticle toughening, thermoplastic resin toughening, interpenetrating network structure toughening, chemical network structure changing toughening, and so on. , Different toughening methods have different toughening mechanisms, single action, or synergistic effects.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Comparison of the Mechanical Behavior of Toughened Epoxy Resin by Different Nanoparticles

Zhao

Shen

et al. 2023

ACS Omega

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Adding nanoparticles as the second phase to epoxy can achieve a good toughening effect. The aim of this paper is to simulate the toughening behavior of epoxy resin by different nanoparticles using a convenient and effective finite element method. The mechanical behaviors of epoxy resins toughened by nano core–shell polymers, liquid rubber, and nanosilica were compared by numerical simulations using the representative volume element (RVE). It is indicated that the addition of a nano core–shell polymer and liquid rubber can reduce the tensile properties of epoxy resin, while nanosilica is on the contrary. With the increase of nanoparticle content, the length of crack propagation decreases, and the toughening effect of the nano core–shell polymer is the best. The failure mode is determined by the particle/matrix interface when the modulus of the nanoparticle is much larger than that of epoxy resin. However, it is determined by the interface properties of the particle/matrix and the modulus of nanoparticles in other cases. The results provide a theoretical basis for toughening nanoparticle selection of nanoparticle-toughened epoxy resin and other similar simulations in the future.

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“…In recent years, in order to better meet the needs of modern industry, researchers have carried out extensive research on the modification method and interpretation mechanism of epoxy resin, and some achievements have been made 11–13 . A large number of studies have shown that the modification methods of epoxy resin mainly include rubber elastomer modification, 14 thermoplastic epoxy resin modification, 13 core‐shell particle polymer modification, 15 interpenetrating network structure (IPN) modification and hyperbranched polymer modification 16,17 . Among them, rubber elastomer modification is relatively mature.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of CNTs loaded bisphenol F epoxy nanocomposites modified by noncovalent dispersant and nonionic surfactant

Xue

Luo

et al. 2021

J of Applied Polymer Sci

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Epoxy resin is one of the most important matrix materials in the field of high performance composites. Its mechanical strength, toughness, and thermal stability are very important to the properties of composites. In this paper, the improvement of epoxy resin properties by carbon nanotubes (CNTs) is mainly studied. First, aniline trimer (AT) and polyethylene glycol octyl phenyl ether (Triton X‐100) are combined to modify CNTs. Then the dispersed CNTs (treated‐CNTs) are used to prepare bisphenol F epoxy nanocomposites. The dispersion of CNTs and fracture surface of composites are analyzed by SEM and TEM. The combination of AT and Triton X‐100 with CNTs is analyzed by UV–vis and FTIR. The mechanical, thermodynamic, tribological properties, and crosslinking density changes of epoxy composites are evaluated. The results show that AT and Triton X‐100 are successfully bonded to the surface of CNTs. The dispersion effect of treated‐CNTs in the composites is better than that of the original CNTs, which have a better reinforcing and toughening effect on the composites. The introduction of treated‐CNT reduces the crosslinking density and glass transition temperature of the composites, but does not affect the thermal stability of the composites before 300°C.

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One-pot synthesis of tetramethyl biphenyl backboned hyperbranched epoxy resin as an efficient toughening modifier for two epoxy curing systems

Cited by 9 publications

References 34 publications

Efficient Toughening of DGEBA with a Bio-Based Protocatechuic Acid Derivative

Efficient Toughening of DGEBA with a Bio-Based Protocatechuic Acid Derivative

Numerical Simulation and Comparison of the Mechanical Behavior of Toughened Epoxy Resin by Different Nanoparticles

Preparation and properties of CNTs loaded bisphenol F epoxy nanocomposites modified by noncovalent dispersant and nonionic surfactant

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