Experimental research on the mechanism of non-monotonic characteristic between curing temperature and mechanical behaviors of Kevlar/epoxy composite

Liu, Li; Hu, Dean; Zhang, YouMin; Han, Xu

doi:10.1007/s11431-017-9254-1

Cited by 5 publications

(6 citation statements)

References 38 publications

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“…Thermoset systems with NTf 2 – anions had lower E a than those with N(CN) 2 – anions, which means ILs with NTf 2 – anions are harder to be influenced by temperature. Furthermore, thermoset systems with NTf 2 – anions had higher curing temperatures, which can be attributed to the interfacial bonding strength of curing agents containing NTf 2 – anions . It can be observed that the 2a /TDE-85 system has the lowest curing temperature, allowing the curing reaction between 2a and epoxy resin to proceed rapidly .…”

Section: Resultsmentioning

confidence: 98%

“…Furthermore, thermoset systems with NTf 2 − anions had higher curing temperatures, which can be attributed to the interfacial bonding strength of curing agents containing NTf 2 − anions. 32 It can be observed that the 2a/TDE-85 system has the lowest curing temperature, allowing the curing reaction between 2a and epoxy resin to proceed rapidly. 33 Thermosets of 2b/TDE-85 has the lowest E a of 8.98 kJ/mol, which can be attributed to the diamine group, which has the highest basicity to promote the curing reaction.…”

Section: Scheme 2 Synthesis Of Dualmentioning

confidence: 98%

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Dual-Functionalized Imidazolium Ionic Liquids as Curing Agents for Epoxy Resins

Jiang

Wang

Liu

et al. 2020

Ind. Eng. Chem. Res.

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As epoxy resin curing agents, ionic liquids can help improve mechanical properties, flame retardancy, and wear and tear self-healing and extend the pot life of epoxy compositions. The functional design of ionic-liquid curing agents may significantly improve the overall performance of epoxy resins. In this paper, a series of dual-functionalized ionic liquids, e.g., 1-(3-amino-3-oxopropyl)-3-propynyl-imidazolium, 1-(3-amino-3-oxopropyl)-3-(2-amino-2-oxoethyl)-imidazolium, and 1-allyl-3-(2-amino-2-oxoethyl)-imidazolium combined with dicyanamide (N(CN)2 –) or bis(trifluoromethylsulfonyl)imide (NTf2 –) anions, were synthesized and characterized as curing agents for diglycidyl-4,5-epoxy-cyclohexane-1,2-dicarboxylate (TDE-85). The results showed that the obtained bifunctional ionic liquids can be used as a medium or high-temperature curing agents for TDE-85 with the curing temperature range of 130–208 °C and the best mass ratio range of 15:100–40:100. Thermosets obtained from the bifunctional ionic liquid and TDE-85 curing system exhibit better heat resistance with the glass transition temperature of 187–212 °C and the decomposition temperature at 10% weight loss of 282–357 °C. The curing reaction mechanism of the 1-(3-amino-3-oxopropyl)-3-(2-amino-2-oxoethyl)-imidazolium NTf2 –/TDE-85 system mainly has three processes.

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Section: Resultsmentioning

confidence: 98%

Section: Scheme 2 Synthesis Of Dualmentioning

confidence: 98%

Dual-Functionalized Imidazolium Ionic Liquids as Curing Agents for Epoxy Resins

Jiang

Wang

Liu

et al. 2020

Ind. Eng. Chem. Res.

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“…Finally, PE-GMA or PE-MAH modified EA was poured into the molds, cured at 165 C for 4 h, and then maintained at 60 C for 4 days. 48 The final mass fraction of PE-GMA or PE-MAH in the modified EA was 0%, 0.3%, 0.5%, and 0.7%, respectively. We named 0.3%, 0.5%, and 0.7% PE-GMA-modified EA as 0.3% GEA, 0.5% GEA, and 0.7% GEA, respectively.…”

Section: Preparation Of Ea and Modified Ea Specimensmentioning

confidence: 89%

“…Then, epoxy resin and curing agent were mixed at 60°C to prepare the epoxy system added to PE‐GMA, PE‐MAH modified asphalt mixture in a specific percentage and mechanically stirred at 160°C for 5 min at 1000 rpm/min. Finally, PE‐GMA or PE‐MAH modified EA was poured into the molds, cured at 165°C for 4 h, and then maintained at 60°C for 4 days 48 . The final mass fraction of PE‐GMA or PE‐MAH in the modified EA was 0%, 0.3%, 0.5%, and 0.7%, respectively.…”

Section: Methodsmentioning

confidence: 99%

Modification of epoxy asphalt by low‐doping PE‐GMA and PE‐MAH

Zhu,

Jing,

Luo

et al. 2023

J of Applied Polymer Sci

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Low‐density polyethylene grafted glycidyl methacrylate (PE‐GMA) and low‐density polyethylene maleic anhydride (PE‐MAH) are low‐cost commercialized polymeric materials. Because of their low viscosity, molecular flexibility, solubility parameters, and polarity similar to asphalt or epoxy resins, PE‐GMA and PE‐MAH are added to epoxy asphalt (EA) to improve the compatibility and toughness of EA. The microstructure, viscosity, thermal stability, dynamic mechanical behavior, and mechanical properties of PE‐GMA and PE‐MAH modified EA were investigated. Smaller and more uniformly distributed asphalt particles were formed in mixes with lower PE‐GMA or PE‐MAH content. The polymer dispersity index of the modified EA is 1.1–1.4 lower than that of the pure EA, and compatibility is significantly improved. The reason is that PE‐GMA and PE‐MAH are polyethylene with polar functional groups, and their molecular structure includes both polar functional groups and nonpolar polyethylene chains, improving the compatibility between polar epoxy resin and nonpolar asphalt in EA. In addition, the incorporation of PE‐GMA or PE‐MAH effectively improves the low‐temperature toughness of EA. It also has high damping performance and tan δ, improved the durability and comfort of EA pavement.

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“…With bullet impacts, the change of fabric temperature is affected. Liu et al 51 found that with the increase in temperature, the thickness of Kevlar/epoxy composites increases. The tensile mechanical behavior is sensitive to curing temperature as well as other factors.…”

Section: Other Factorsmentioning

confidence: 99%

Anti-Ballistic Properties of Aramid Fabrics and Composites: A Review

Miao¹,

Yang²,

Xin³

2021

AATCC Journal of Research

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In studies of ballistic impact, the materials used in body armor must have high hardness, light weight, fatigue resistance, corrosion resistance, and other high performance characteristics. Aramid fibers are widely used in anti-ballistic materials. To facilitate the further development of aramid materials, this study reviews aramid research in recent years and analyzes the main factors affecting, and new methods for optimizing, anti-ballistic performance, with the emphasis on bulletproof fabrics. This review provides suggestions for future research and use of aramid materials for anti-ballistic performance.

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Experimental research on the mechanism of non-monotonic characteristic between curing temperature and mechanical behaviors of Kevlar/epoxy composite

Cited by 5 publications

References 38 publications

Dual-Functionalized Imidazolium Ionic Liquids as Curing Agents for Epoxy Resins

Dual-Functionalized Imidazolium Ionic Liquids as Curing Agents for Epoxy Resins

Modification of epoxy asphalt by low‐doping PE‐GMA and PE‐MAH

Anti-Ballistic Properties of Aramid Fabrics and Composites: A Review

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