LDH as a multifunctional additive in EVA/TPU blends: Influence on mechanical, thermal, rheological and flame retardancy properties

Dutta, Joyeeta; Chatterjee, Tuhin; Naskar, Kinsuk

doi:10.1016/j.mseb.2018.11.025

Cited by 18 publications

(10 citation statements)

References 61 publications

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“…Figure 12 also shows that the initial temperature of thermal decomposition of TGAL0 and TGAL5 is lower than that of pure TPU. This is due to the catalytic carbonization effect of LDHs in the composite, which plays a pivotal role in the early thermal decomposition of TPU [39] . In addition, The DTG of all samples also show two obvious peaks, which corresponds to the two pyrolysis stages of the composite materials.…”

Section: Resultsmentioning

confidence: 88%

Preparation of TPU/GO/Mg‐Al LDHs Hybrid Material With Enhancing Flame Retardancy and Smoke Suppression Performance

Yang

Lin

et al. 2022

ChemistrySelect

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Flammability of Thermoplastic polyurethane (TPU) limits its application in automotive, wires and cables, sports and textile coatings. Endowing TPU with simultaneously improved flame retardancy and smoke-suppressant will be highly beneficial. Herein, a novel green and efficient condensed phase GO/ MgÀ Al layered double hydroxides (LDHs) flame retardant for TPU was synthesized by the co-precipitation of Mg 2 + and Al 3 + and assembled with graphene oxide (GO) by electrostatic interaction. The unique two-dimensional layered structure of GO/LDHs has a large specific surface area, which can form a dense and uniform char layer during the combustion process, thus hindering mass and heat transfer between gaseous and condensed phases. The XRD, TEM, SEM and EDS results showed that MgÀ Al LDHs and GO/LDHs were successfully synthesized. The thermal, flame retarding and smoke suppression properties of TPU/GO/MgÀ Al LDHs were determinated by UL-94, limiting oxygen index (LOI), cone calorimeter (CCT) and smoke density (SDT). UL-94 testing results showed that all the TPU/GO/MgÀ Al LDHs samples had a vertical combustion rating of V-0. Compared with pure TPU (19.1 � 0.2 %), the LOI value of all TPU/GO/MgÀ Al LDHs composites are above 27 %. CCT results showed TGAL3 sample displayed the lowest peaks of heat release rate (pHRR) value of 142.9 � 9.3 Kw m À 2 . The total heat release (THR) value of TGAL5 is almost 70 % lower than that of pure TPU. In addition, compared to pure TPU, GO/MgÀ Al LDHs materials has excellent performance in smoke suppression. The digital photos and Raman spectra of char residue demonstrated that TPU/GO/MgÀ Al LDHs materials has a denser carbon layer after combustion. Apart from flame retarding and smoke suppression, the mechanical properties of TPU/GO/MgÀ Al LDHs can maintain more than 80 % of the original TPU after addition of GO/LDHs. These results indicates that GO/LDHs composites is a kind of two-dimensional layered material with unique structure and excellent flame retardant and smoke suppression.

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Section: Resultsmentioning

confidence: 88%

Preparation of TPU/GO/Mg‐Al LDHs Hybrid Material With Enhancing Flame Retardancy and Smoke Suppression Performance

Yang

Lin

et al. 2022

ChemistrySelect

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“…[38][39][40][41][42][43] Compared to these nanoparticles, LDHs have represented a new field of interest due to their highly tunable features and controlled constitutes, and interlayer ion exchangeability as well as wide potential particularly in drug delivery, nanomedicine, and bioengineering. [44][45][46][47] LDHs are known as a class of anionic clay with positively charged Brucite (Mg[OH] 2 ) nanosheets less than 100 nm in diameter and exchangeable anions and water molecules located in the interlayer. [48][49][50] LDHs are typically demonstrated by…”

Section: Introductionmentioning

confidence: 99%

“…Recently, various nanocomposites hydrogels have been developed by using nanoparticles including graphene oxide, nanosilicate, reduced graphene oxide, and layered double hydroxides (LDHs) to enhance rheological and mechanical properties of material 38–43 . Compared to these nanoparticles, LDHs have represented a new field of interest due to their highly tunable features and controlled constitutes, and interlayer ion exchangeability as well as wide potential particularly in drug delivery, nanomedicine, and bioengineering 44–47 . LDHs are known as a class of anionic clay with positively charged Brucite (Mg[OH] 2 ) nanosheets less than 100 nm in diameter and exchangeable anions and water molecules located in the interlayer 48–50 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, LDHs have been used as additive to polymer matrix, drug delivery agent, osteogenic differentiation and antibacterial agent. In particular, LDHs sheets could disperse homogeneously within polymer matrix providing strong interfacial interaction in polymer network and eventually lead to enhancement in physico‐mechanical properties 46,52,53 . Moreover, LDHs could form a mechanically stable network with shear‐thinning characteristics 46,53 .…”

Section: Introductionmentioning

confidence: 99%

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Optimization of methacrylated gelatin /layered double hydroxides nanocomposite cell‐laden hydrogel bioinks with high printability for 3D extrusion bioprinting

Alarçin

İzbudak

Erarslan

et al. 2022

J Biomedical Materials Res

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Layered double hydroxides (LDHs) offer unique source of inspiration for design of bone mimetic biomaterials due to their superior mechanical properties, drug delivery capability and regulation cellular behaviors, particularly by divalent metal cations in their structure. Three-dimensional (3D) bioprinting of LDHs holds great promise as a novel strategy thanks to highly tunable physiochemical properties and shear-thinning ability of LDHs, which allow shape fidelity after deposition. Herein, we introduce a straightforward strategy for extrusion bioprinting of cell laden nanocomposite hydrogel bioink of gelatin methacryloyl (GelMA) biopolymer and LDHs nanoparticles. First, we synthesized LDHs by co-precipitation process and systematically examined the effect of LDHs addition on printing parameters such as printing pressure, extrusion rate, printing speed, and finally bioink printability in creating grid-like constructs. The developed hydrogel bioinks provided precise control over extrudability, extrusion uniformity, and structural integrity after deposition. Based on the printability and rheological analysis, the printability could be altered by controlling the concentration of LDHs, and printability was found to be ideal with the addition of 3 wt % LDHs. The addition of LDHs resulted in remarkably enhanced compressive strength from 652 kPa (G-LDH0) to 1168 kPa (G-LDH3). It was shown that the printed nanocomposite hydrogel scaffolds were able to support encapsulated osteoblast survival, spreading, and proliferation in the absence of any osteoinductive factors taking advantage of LDHs. In addition, cells encapsulated in G-LDH3 had a larger cell spreading area and higher cell aspect ratio than those encapsulated in G-LDH0. Altogether, the results demonstrated that the developed GelMA/LDHs nanocomposite hydrogel bioink revealed a high potential for extrusion bioprinting with high structural fidelity to fabricate implantable 3D hydrogel constructs for repair of bone defects.

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“…Unfortunately, the halogen additives can reduce the heat parameters but they have been prohibited because of releasing many toxic and corrosive gases such as halogenated hydrogen during the combustion 11,12 . In this way, halogen‐free flame retardants have attracted much more attention because of their advantages of low smoke and low toxicity 13,14 . Among these flame retardants, phosphonium flame retardant has attracted most attention because of its clear, low price, and high flame‐retardant efficiency 15–18 .…”

Section: Introductionmentioning

confidence: 99%

Research on the fire safety effect of thermoplastic polyurethane elastomer based on sodium fumarate

Wei

Chen

Jiao

et al. 2021

Polymers for Advanced Techs

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Sodium fumarate (SF, C4H3NaO4), as a low‐cost and environment‐friendly additive, has been applied as the fire safety agent to investigate the flame retardancy and smoke suppression property in thermoplastic polyurethane elastomer (TPU). A series of tests were carried out, including limiting oxygen index (LOI), cone calorimeter test (CCT), smoke density test (SDT), and thermogravimetric/Fourier transform infrared spectroscopy (TG‐IR). The results proved that the addition of SF can significantly improve the fire safety property of TPU. Remarkably, in the case of the sample containing 2.0 wt% SF, LOI was raised up to 27.5 compared with 21.0 of pure TPU. The CCT results showed that pHRR, THR, TSR, and SF values decreased by 60.1%, 17.0%, 44.6%, and 66.4%, respectively, while the residual mass increased from 3.0% to 12.3% compared with pure TPU. The digital photographs displayed a more compact and intense carbon layer after the addition of SF. The SDT results indicated SF has increased the luminous flux and reduced Ds values, implying the improvement of the smoke suppression property of TPU. TG and TG‐IR results showed that the addition of SF has promoted the char forming process and reduced the release of CO2 and other volatile compounds. All results of tests illustrated that SF has considerable fire safety effect on TPU. Through the analysis of the results of this experiment, it will make a significance in the aspect of fire safety of polymer.

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LDH as a multifunctional additive in EVA/TPU blends: Influence on mechanical, thermal, rheological and flame retardancy properties

Cited by 18 publications

References 61 publications

Preparation of TPU/GO/Mg‐Al LDHs Hybrid Material With Enhancing Flame Retardancy and Smoke Suppression Performance

Preparation of TPU/GO/Mg‐Al LDHs Hybrid Material With Enhancing Flame Retardancy and Smoke Suppression Performance

Optimization of methacrylated gelatin /layered double hydroxides nanocomposite cell‐laden hydrogel bioinks with high printability for 3D extrusion bioprinting

Research on the fire safety effect of thermoplastic polyurethane elastomer based on sodium fumarate

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