Hyperbranched polyether as an all-purpose epoxy modifier: controlled synthesis and toughening mechanisms

Liu, Tuan; Nie, Yongxing; Chen, Ruoshi; Zhang, Liangdong; Li, Xiaoyü

doi:10.1039/c4ta04841e

Cited by 116 publications

(109 citation statements)

References 56 publications

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“…All curves exhibit as ingle glass transition. [20] The increasei nl ignin content led to an increaseo fFWHM, which is caused by the polydisperse nature of lignin. The storage modulus often depends on the stiffness of the backbone structure and crosslinkd ensity.L ignin is much stiffer than PEGepoxy and possessesm ultifunctional reactive groups;t herefore, the modulus of the network increases with lignin content.…”

Section: Resultsmentioning

confidence: 99%

A High‐Lignin‐Content, Removable, and Glycol‐Assisted Repairable Coating Based on Dynamic Covalent Bonds

et al. 2019

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Section: Resultsmentioning

confidence: 99%

A High‐Lignin‐Content, Removable, and Glycol‐Assisted Repairable Coating Based on Dynamic Covalent Bonds

et al. 2019

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“…The introduction of functional monomer can extend the induction time of curing reaction . This extension is beneficial to eliminating the residual stress . Moreover, the introduction of monomer can decrease the curing temperature and accelerate the curing reaction .…”

Section: Resultsmentioning

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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“…D. Foix and co-workers [33] suggested that epoxy group conversion was increased and phase separation was reached during UV curing by the addition of HBP. T. Liu and co-workers [34] reported an epoxideterminated hyperbranched aromatic polyether (EHBPE) that could notably improve the toughness, T g , and tensile strength, and there was a non-phase-separated phenomenon. M. Ganjaee Sari et al [35] carried out surface modification of nanoclay particles by various amounts of polyeater-amide hyperbranched polymer.…”

Section: Introductionmentioning

confidence: 97%

Synthesis and characterization of amino-terminated hyperbranched polymer and its effect on impact resistance of epoxy resin thermosets

Cui

Hou

2015

Colloid Polym Sci

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Amino-terminated hyperbranched polymer (HBP-NH 2 ) was synthesized from diethylenetriamine (DETA) and methyl acrylate (MA) by melt polycondensation through AB 3 and AB 2 route, and its chemical structure was characterized by attenuated total internal reflectance infrared spectroscopy (ATR-IR) and 1 H nuclear magnetic resonance ( 1 H-NMR) spectroscopy. Then, the influence of HBP-NH 2 content on the toughness improvement and fractural surface morphology of diglycidyl ether of bisphenol A (DGEBA) cured systems was investigated through impact resistance test and field emission scanning electron microscopy (FESEM), respectively. The results indicated that HBP-NH 2 can enhance the toughness of epoxy cured system near 61 % than the neat DGEBA cured thermosets. FESEM images show that the toughness enhancement of epoxy system should be based on shearing deformation mechanism (the thermosets modified with low content of HBP-NH 2 ) and the second phase toughening mechanism (the thermosets modified with high content of HBP-NH 2 ).

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Hyperbranched polyether as an all-purpose epoxy modifier: controlled synthesis and toughening mechanisms

Abstract: Controlled synthesis and toughening mechanisms of an all-purpose hyperbranched modifier, which can form non-phase-separated networks with simultaneous enhancements in Tg, modulus, impact and tensile strengths.

Cited by 116 publications

References 56 publications

A High‐Lignin‐Content, Removable, and Glycol‐Assisted Repairable Coating Based on Dynamic Covalent Bonds

A High‐Lignin‐Content, Removable, and Glycol‐Assisted Repairable Coating Based on Dynamic Covalent Bonds

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

Synthesis and characterization of amino-terminated hyperbranched polymer and its effect on impact resistance of epoxy resin thermosets

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