Structural characterization, thermal and mechanical properties of polyurethane–MgAl–layered double hydroxide nanocomposites prepared via physical dispersion

Starukh, G. N.; Budzinska, Vira; Brychka, Sergey

doi:10.1007/s13204-019-01035-z

Cited by 7 publications

(7 citation statements)

References 35 publications

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“…Figure12represents a graphical illustration of the flame retardancy of LDH1, LDH2 and ZrP3 additives in PIR as presented in previous sections. As it was revealed andIn the condensed phase in accordance to research findings[3,4,10], char layer formation plays an important role in restraining the heat penetration and the intrusion of oxygen, thus protecting the underlying PIR matrix. As revealed from the the CC and TGA resultsanalysis, LDH1, LDH2 and ZrP3 nanofillers increase thermal stability implying superior barrier properties[50,51].…”

supporting

confidence: 80%

“…The initial degradation temperature, T5%, is 255 o C for pure PIR. Additional weight loss stage associated with water loss rising from physical absorbed water, crystal water and dehydroxylation of LDH1 and LDH2 have been observed for those samples between 130 and 240 o C [4]. ZrP3 also undergoes a dehydration process with a maximum weight loss temperature at around 140 o C [38].…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 87%

“…This polyol mix was then mixed with fillers for 5 min at 2500 rpm. The required amounts of isocyanate, methylene diphenyl diisocyanate (MDI), were finally poured into the mixture and stirred of LDH fillers revealed that their incorporation in polyurethane composites in a range of concentrations from 0.5% to 8% [3,4,10,11], improved their thermal properties [3], flame retardancy [4] resulting in decreased HRR [11]. Three concentrations of each filler in each of the samples were examined, i.e., 2, 6 4 and 6 % by weight.…”

Section: Samples Preparationmentioning

confidence: 99%

“…The use of fillers in PIR foams can reinforce the polymer matrices in terms of energy performance, mechanical and thermal stability, smoke suppression and fire-retardant properties [2,3,4,5]. To improve the fire-retardant performance of polymer insulation-related flame retardants, there is a tendency to substitute the commonly used halogenated flame retardants with more eco-friendly "greener" ones.…”

Section: Introductionmentioning

confidence: 99%

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Fire Retardant Action of Layered Double Hydroxides and Zirconium Phosphate Nanocomposites Fillers in Polyisocyanurate Foams

et al. 2020

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Modern day energy codes are driving the design and multi-layered configuration of exterior wall systems with a significant emphasis on achieving high performance insulation towards improving energy performance of building envelopes. Use of highly insulating polyisocyanurate (PIR) based materials enhanced with eco-friendly lamellar inorganic fillers reinforces energy performance requirements, environmental challenges and cost reduction without compromising the overall building fire safety. The current work assessed the fire behaviour of PIR modified with three layered fillers, namely MgAlCO3 (PIR-LDH1), MgAl Stearate (PIR-LDH2) and Zirconium Phosphate octadecylamine (PIR-ZrP3). For each of the fillers, three loadings (2, 4 and 6 % by weight) were used.Optical analysis by X-ray diffraction patterns (XRD), cone calorimeter (CC), thermogravimetric (TGA) analysis, post-burning morphological evaluation using field emission scanning electron microscope (FESEM) and diffuse reflectance infrared spectroscopy (DRIFT) analysis, were performed. The results indicated that fire reaction properties and thermal stability of foam samples were enhanced with three different types of lamellar inorganic smart fillers. The initial degradation temperature of PIR-layered filler samples was increased, demonstrating that incorporation of flame retardants decelerated the degradation of PIR foam and contributed to significant char formation, from 19.5% in pure PIR samples to 33% in PIR-6%LDH1 samples. Increasing the filler content also resulted in improved char properties and decreased peak Heat Release Rates (HRR) in the cone calorimeter.Due to the development of a stable char layer, samples containing 6% of ZrP3 did not ignite at 20kW/m 2 and a reduction of up to 40% in the peak HRR was achieved in PIR-2%ZrP3 samples.

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supporting

confidence: 80%

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 87%

Section: Samples Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fire Retardant Action of Layered Double Hydroxides and Zirconium Phosphate Nanocomposites Fillers in Polyisocyanurate Foams

et al. 2020

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“…Flexible polyurethane foam (FPUF) has been favored by various industries due to its unique porous structure, such as small weight, pleasurable thermal insulation performance, and high specific strength, which has been widely used in food refrigeration, industrial pipelines, building materials, aviation seats, and other areas. 1,2 However, because of its unique molecular structure, FPUF emits immense amounts of heat during combustion, which aggravates the fire risk, releases toxic fumes, 3 and threatens people's health. Therefore, it is necessary to modify the flame retardant of FPUF so as to expand its application scope.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of flame‐retardant and smoke‐suppressant of flexible polyurethane foam with modified hydrotalcite

Zhang

Wen

et al. 2021

Polymers for Advanced Techs

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The hydrotalcite has been chemically modified by using the ion exchange method to insert dihydrogen phosphate between the carbonate-type magnesium-aluminum hydrotalcite layers. And then, the effect of modified hydrotalcite on the flame retardancy and smoke suppression properties of flexible polyurethane foam (FPUF) has been investigated using limiting oxygen index (LOI) method, cone calorimeter test (CONE), smoke density chamber, flue gas analyzer, and scanning electron microscope (SEM). The current indicated that the LOI of flame-retardant modified FPUF was increased to 25.4%. And the peak heat release rate (PHRR) and total heat release (THR) of the samples were decreased by 74.9 kW/m 2 and by 9.7 MJ/m 2 , respectively. Additionally, the total amount of flue gas produced by combustion was reduced by 157.7 m 2 /m 2 , and the maximum concentration of carbon monoxide (CO) gas decreased from 51.3 to 23.8 mg/m 3 . Based on these data, it can be found that the hydrotalcite modified by dihydrogen phosphate intercalation had an excellent flame-retardant and smoke-suppressant effect, and 15% of modified hydrotalcite was the most appropriate amount during the combustion process of the modified FPUFs.

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In situ one‐step fabrication of layered double hydroxide deposited on cellulose: Effect of modified cellulose on physical properties of polyurethane composites

Viscusi

D'Amico

Gorrasi

2022

Polymers for Advanced Techs

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The article reports the fabrication of cellulose-layered double hydroxide (LDH) obtained by urea hydrolysis method. A wide characterization was carried out to assess the morphological, spectroscopic and barrier properties of LDH modified cellulose. The cellulose-LDH was then used as hybrid reinforcement in polyurethane (PU) composites. A slight improvement in thermal stability of PU was achieved and a better hydrophilicity was obtained, due to the intrinsic polarity of LDH. Elastic modulus of PU composites increased up to 48 MPa for a filler loading of 10% wt. Finally, UV barrier properties were studied in the range 280-700 nm. The produced composite showed a noticeable decrease in light transmission as the reinforcement content increase, displaying high light-blocking properties with a quasi-total resistance to transmission in UV range.

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Structural characterization, thermal and mechanical properties of polyurethane–MgAl–layered double hydroxide nanocomposites prepared via physical dispersion

Cited by 7 publications

References 35 publications

Fire Retardant Action of Layered Double Hydroxides and Zirconium Phosphate Nanocomposites Fillers in Polyisocyanurate Foams

Fire Retardant Action of Layered Double Hydroxides and Zirconium Phosphate Nanocomposites Fillers in Polyisocyanurate Foams

Fabrication and characterization of flame‐retardant and smoke‐suppressant of flexible polyurethane foam with modified hydrotalcite

In situ one‐step fabrication of layered double hydroxide deposited on cellulose: Effect of modified cellulose on physical properties of polyurethane composites

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