Silica Loaded Binary Epoxy Resins Cured by an Imide–Amine Hardener Suitable for Preparing Transparent and Flexible Coatings

Naeemikhah, Elham; Behniafar, Hossein

doi:10.1134/s1560090423700768

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…When the resin reached the maximum modulus value, it indicated that the resin was fully cured and the condensation was complete [ 42 , 43 ]. As shown in Figure 8 , the temperature at which the pure PF resin completed condensation was 173 °C.…”

Section: Resultsmentioning

confidence: 99%

“…It could be seen from Figure 8 that the slopes of the DMA curves for PFC resins with HBP-NH 2 addition were higher than that of pure PF resin, indicating that the addition of HBP-NH 2 can promote the rapid curing of PF resin between wood strips. When the resin reached the maximum modulus value, it indicated that the resin was fully cured and the condensation was complete [42,43]. As shown in Figure 8, the temperature at which the pure PF resin completed condensation was 173 • C. The PFC1 and PFC5 resins were basically below 173 • C, which was lower than the PF resin.…”

Section: Dma Analysismentioning

confidence: 97%

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Effects of the Addition of Amino-Terminated Highly Branched Polyurea on Curing Properties of Phenol-Formaldehyde Resin

et al. 2023

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In this work, a highly branched polyurea (HBP-NH2) similar to urea structure was introduced to phenol-formaldehyde (PF) resin to accelerate itscuring speed The results of gel time and bonding strength were combined to obtain a good modified additional stage and amount of HBP-NH2. The relative molar mass changes of HBP-NH2-modified PF resin were investigated by gel permeation chromatography (GPC). The effects of HBP-NH2 on the curing of PF resin were investigated by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The effect of HBP-NH2 on the structure of PF resin was also investigated by nuclear magnetic resonance carbon spectroscopy (13C-NMR). The test results show that the gel time of the modified PF resin was reduced by 32% and 51% at 110 °C and 130 °C, respectively. Meanwhile, the addition of HBP-NH2 increased the relative molar mass of PF resin. The bonding strength test showed that the bonding strength of modified PF resin increased by 22% after soaking in boiling water (93 °C ± 2) for 3 h. The DSC and DMA analysis indicated that the curing peak temperature decreased from 137 °C to 102 °C, and the curing rate of the modified PF resin was also faster than that of the pure PF resin. The 13C-NMR results showed that HBP-NH2 in the PF resin reacted to produce a co-condensation structure. Finally, the possible reaction mechanism of HBP-NH2 for the modification of PF resin was given.

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Section: Resultsmentioning

confidence: 99%

Section: Dma Analysismentioning

confidence: 97%

Effects of the Addition of Amino-Terminated Highly Branched Polyurea on Curing Properties of Phenol-Formaldehyde Resin

et al. 2023

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Enhancement of Moisture‐Resistant Performance of Epoxy Resins via Introduction of Hydrophobic and Flexible Chains

Zhu,

Yang,

et al. 2024

Macro Chemistry & Physics

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The introduction of long and flexible polyether chains in epoxy resins is an effective method to improve their toughness. However, using the hydrophilicity/hydrophobicity of polyether chains to tune their moisture resistance has been overlooked currently. In this work, two types of polyether‐based diglycidyl ethers with hydrophilic poly(oxyethylene) (DGEPOE) and relatively hydrophobic poly(oxybutylene) segments (DGEPOB) are synthesized and then binary‐cured with commercial diglycidyl ether of bisphenol A (DGEBA), respectively, yielding the corresponding DGEPOE:DGEBA‐m:ns and DGEPOB:DGEBA‐m:ns based on various ratios. For comparison, pure DGEPOEr, DGEPOBr, and DGEBAr resins are also prepared. Results show that the equilibrium water uptake of DGEPOB:DGEBA‐m:ns is at least less than one‐fifth of that of DGEPOE:DGEBA‐m:ns; meanwhile, the diffusion coefficients of water molecules in DGEPOB:DGEBA‐m:ns are also 1–2 orders of magnitude lower than those in DGEPOE:DGEBA‐m:ns, demonstrating that the incorporation of hydrophobic POB chains can significantly reduce the hygroscopicity of resins. Moreover, DGEPOB:DGEBA‐m:ns not only exhibit superior flexibility and ductility relative to pure DGEBAr, but display exceptional strength and toughness in comparison with pure DGEPOBr. These findings suggest that tuning the hydrophilicity/hydrophobicity of building units of epoxy monomers offers a promising strategy for developing high‐performance epoxy materials, especially suitable for humid environments.

show abstract

Silica Loaded Binary Epoxy Resins Cured by an Imide–Amine Hardener Suitable for Preparing Transparent and Flexible Coatings

Cited by 2 publications

References 36 publications

Effects of the Addition of Amino-Terminated Highly Branched Polyurea on Curing Properties of Phenol-Formaldehyde Resin

Effects of the Addition of Amino-Terminated Highly Branched Polyurea on Curing Properties of Phenol-Formaldehyde Resin

Enhancement of Moisture‐Resistant Performance of Epoxy Resins via Introduction of Hydrophobic and Flexible Chains

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