Functionalized layered double hydroxide-based epoxy nanocomposites with improved flame retardancy and mechanical properties

Kalali, Ehsan Naderi; Wang, Xin; Wang, De‐Yi

doi:10.1039/c5ta00010f

Cited by 232 publications

(151 citation statements)

References 29 publications

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“…As expected, the increase of free volume led to higher toughness due to the formation of more mobile networks, which could more efficiently produce plastic deformation and absorb energy than neat epoxy. Clearly, the β‐transition of EHBP/DGEBA composites are much broader than that of neat epoxy, indicating that EHBP promoted the mobility of epoxy chains and increased the fracture toughness of epoxy thermosets .…”

Section: Resultsmentioning

confidence: 99%

Simultaneous toughening and strengthening of diglycidyl ether of bisphenol‐a using epoxy‐ended hyperbranched polymers obtained from thiol‐ene click reaction

Zhang

Liu

Cheng

et al. 2017

Polymer Engineering & Sci

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Epoxy‐ended hyperbranched polymers (EHBP) has become a class of additives for diglycidyl ether of bisphenol‐A (DGEBA), but it is tedious processes retards wide application. Here, we prepared EHBP by a thiol‐ene click reaction between thiol‐terminated hyperbranched polyesters and allyl glycidyl ether and modified DGEBA. The incorporation of EHBP significantly enhanced the toughness and strength of DGEBA. The mechanical properties of EHBP/DGEBA composite increased remarkably with the increasing EHBP molecular weight initially, and then decreased with further increase of EHBP molecular weight. The maximum increase of mechanical properties was observed in EHBP‐12/DGEBA composites. With increasing EHBPE‐12 content, the mechanical performance of the EHBP‐12/DGEBA composites increased firstly and plateaued at 9 wt% EHBP‐2. At 9 wt% EHBP‐12 content, the tensile strength, flexural strength and impact strength increased to 74.46 MPa, 143.58 MPa, and 39.09 kJ m−2, respectively. When loading was increased from 12 to 15 wt%, the mechanical performance started to decrease. The use of EHBP slightly decreased the thermal stability and the glass transition temperature. Protonema observed in the fracture surface can be used to explain the significant improvement in mechanical properties. POLYM. ENG. SCI., 58:1703–1709, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Simultaneous toughening and strengthening of diglycidyl ether of bisphenol‐a using epoxy‐ended hyperbranched polymers obtained from thiol‐ene click reaction

Zhang

Liu

Cheng

et al. 2017

Polymer Engineering & Sci

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“…The combination of tailored polymers with inorganic nanoparticles, e.g. nanoclays14151617181920212223 or carbon nanotubes24252627, glass fabric28, polyhedral silsesquioxanes (POSS)2930, layered double hydroxides31323334, providing oxygen barrier properties and mechanical strength, preventing dripping of hot, molten plastics, and enabling an intumescent, self-expanding foam-like heat barrier behavior is a most promising approach for fire-retardant coating materials35. Aiming at a quantitative understanding in such materials requires approaches towards structurally well-defined surface coatings, in which benefits in the fire behavior can explicitly be linked to defined composition and architecture.…”

mentioning

confidence: 99%

Large-scale, thick, self-assembled, nacre-mimetic brick-walls as fire barrier coatings on textiles

Das

Thomas

Moeller

et al. 2017

Sci Rep

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Highly loaded polymer/clay nanocomposites with layered structures are emerging as robust fire retardant surface coatings. However, time-intensive sequential deposition processes, e.g. layer-by-layer strategies, hinders obtaining large coating thicknesses and complicates an implementation into existing technologies. Here, we demonstrate a single-step, water-borne approach to prepare thick, self-assembling, hybrid fire barrier coatings of sodium carboxymethyl cellulose (CMC)/montmorillonite (MTM) with well-defined, bioinspired brick-wall nanostructure, and showcase their application on textile. The coating thickness on the textile is tailored using different concentrations of CMC/MTM (1–5 wt%) in the coating bath. While lower concentrations impart conformal coatings of fibers, thicker continuous coatings are obtained on the textile surface from highest concentration. Comprehensive fire barrier and fire retardancy tests elucidate the increasing fire barrier and retardancy properties with increasing coating thickness. The materials are free of halogen and heavy metal atoms, and are sourced from sustainable and partly even renewable building blocks. We further introduce an amphiphobic surface modification on the coating to impart oil and water repellency, as well as self-cleaning features. Hence, our study presents a generic, environmentally friendly, scalable, and one-pot coating approach that can be introduced into existing technologies to prepare bioinspired, thick, fire barrier nanocomposite coatings on diverse surfaces.

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“…Although EP-M2.5 surface exhibits lower cracks in comparison to pure EP, it still has an incompact surface. On the other hand, EP-D2.5 shows a dense and fully compacted surface morphology without any cracks on its surface, leading to the lower efficiency of heat and volatiles transfer due to the obstructing effect, and consequently providing underlying epoxy matrix with an effective barrier67. Fire propagation was simply evaluated through the keeping a flame near the samples, which their photographs are presented in Fig.…”

Section: Results and Disccusionsmentioning

confidence: 99%

Fish DNA-modified clays: Towards highly flame retardant polymer nanocomposite with improved interfacial and mechanical performance

Zabihi

Ahmadi

Khayyam

et al. 2016

Sci Rep

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Deoxyribonucleic Acid (DNA) has been recently found to be an efficient renewable and environmentally-friendly flame retardant. In this work, for the first time, we have used waste DNA from fishing industry to modify clay structure in order to increase the clay interactions with epoxy resin and take benefit of its additional thermal property effect on thermo-physical properties of epoxy-clay nanocomposites. Intercalation of DNA within the clay layers was accomplished in a one-step approach confirmed by FT-IR, XPS, TGA, and XRD analyses, indicating that d-space of clay layers was expanded from ~1.2 nm for pristine clay to ~1.9 nm for clay modified with DNA (d-clay). Compared to epoxy nanocomposite containing 2.5%wt of Nanomer I.28E organoclay (m-clay), it was found that at 2.5%wt d-clay loading, significant enhancements of ~14%, ~6% and ~26% in tensile strength, tensile modulus, and fracture toughness of epoxy nanocomposite can be achieved, respectively. Effect of DNA as clay modifier on thermal performance of epoxy nanocomposite containing 2.5%wt d-clay was evaluated using TGA and cone calorimetry analysis, revealing significant decreases of ~4000 kJ/m2 and ~78 kW/m2 in total heat release and peak of heat release rate, respectively, in comparison to that containing 2.5%wt of m-clay.

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Functionalized layered double hydroxide-based epoxy nanocomposites with improved flame retardancy and mechanical properties

Cited by 232 publications

References 29 publications

Simultaneous toughening and strengthening of diglycidyl ether of bisphenol‐a using epoxy‐ended hyperbranched polymers obtained from thiol‐ene click reaction

Simultaneous toughening and strengthening of diglycidyl ether of bisphenol‐a using epoxy‐ended hyperbranched polymers obtained from thiol‐ene click reaction

Large-scale, thick, self-assembled, nacre-mimetic brick-walls as fire barrier coatings on textiles

Fish DNA-modified clays: Towards highly flame retardant polymer nanocomposite with improved interfacial and mechanical performance

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