Synergistic effect between zeolitic imidazolate framework‐8 and expandable graphite to improve the flame retardancy and smoke suppression of polyurethane elastomer

Wang, Guisong; Xu, Wenzong; Chen, Rui; Li, Wu; Liu, Yucheng; Yang, Kai

doi:10.1002/app.48048

Cited by 20 publications

(11 citation statements)

References 51 publications

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“…The vibration peaks at 500–1500 cm −1 are attributed to the in‐plane bending and stretching vibration of the imidazole ring. The absorption vibration peaks at 2925 and 3134 cm −1 are the asymmetric absorption vibration peaks of the CH bond in CH 3 38 . The absorption peaks at 1500 and 1296 cm −1 are derived from the C═C stretching vibration of the benzene ring in the ODA and COC groups.…”

Section: Resultsmentioning

confidence: 98%

“…The absorption vibration peaks at 2925 and 3134 cm À1 are the asymmetric absorption vibration peaks of the C H bond in CH 3 . 38 The absorption peaks at 1500 and 1296 cm À1 are derived from the C═C stretching vibration of the benzene ring in the ODA and C O C groups. The Figure 3(C) shows new absorptions at 1192 and 929 cm À1 , which belong to P═N and P N bonds.…”

Section: Characterizationmentioning

confidence: 99%

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Metal‐organic frameworks derived ZnO@MOF@PZS flame retardant for reducing fire hazards of polyurea nanocomposites

Wang

Chen

Liu

et al. 2021

Polymers for Advanced Techs

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Transition metal as flame retardant has attracted intense interests in recent years. In this work, ZnO@MOF@PZS was prepared via hydrothermal and polycondensation methods. ZnO nanoflowers played the role as a template for growth of MOF@PZS and zinc source for formation of MOF. Subsequently, the obtained ZnO@MOF@PZS was mixed into polyurea (PUA) to investigate its flame retardancy and toxicity suppression properties. The cone calorimeter test (CCT) showed that ZnO@MOF@PZS significantly improved the flame retardancy of PUA composites. The addition of 3 wt% ZnO@MOF@PZS into PUA could result in peak heat release rate (PHRR), total heat release (THR) and total CO production (TCO) of 28.30%, 19.59% and 36.65%, respectively. The result of universal testing machine showed that ZnO@MOF@PZS‐add PUA had better mechanical properties. It is notable that the improved flame retardant properties for PUA composites are mainly attributed to ZnO@MOF@PZS promoting the formation of dense char residue.

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Section: Resultsmentioning

confidence: 98%

Section: Characterizationmentioning

confidence: 99%

Metal‐organic frameworks derived ZnO@MOF@PZS flame retardant for reducing fire hazards of polyurea nanocomposites

Wang

Chen

Liu

et al. 2021

Polymers for Advanced Techs

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show abstract

“…[26][27][28] Researchers have used a variety of tests and methods to study flame retardancy. [29][30][31][32] In this study, the samples were prepared in 10 cm× 10 cm size and put over a 2 cm length flame at a 3 | RESULTS AND DISCUSSION Table 2 represents the amounts of required materials in sample synthesis. Moreover, the IV of the samples is given.…”

Section: Characterization and Properties Measurementsmentioning

confidence: 99%

Flame retardancy and thermal properties of poly(butylene succinate)/ nano‐boehmite composites prepared via in situ polymerization

Kahkesh

Rafizadeh

2020

Polymer Engineering & Sci

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Poly(butylene succinate) (PBS) and its nanocomposites with nanoboehmite (nBhm) were synthesized via direct esterification between succinic acid and butylene glycol (BG). Boehmite (Bhm) nanoparticles, up to 2%, were added in the polycondensation step. Repeatability of runs was observed by the amount of the gathered water. Temperature trajectory was considered as an indication of the polycondensation start. Mixing torque was measured and its rapid increase, up to 0.6 Nm, was deliberated as the end of the process. Polycondensation time decreases with an increase in amount of nBhm due to the catalytic role of aluminum in Bhm. The chemical structure of PBS was proved through Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopies. XRD spectrum and scanning electron microscope images show a good distribution of nanoparticles in the polymer matrix. Differential scanning calorimetric results determine that Tg increases with the nanoparticle content. Improved Avrami equation was fitted to study the kinetics of the crystallization of samples. As a result, spherulite crystal growth was determined based on the Avrami index. Thermal gravimetric analysis trends are the same, however, nanocomposites show more residual ash. Atomic force microscopy images show that nanocomposites have a rough surface. It was observed that the flame advancement decreases up to 60% and limiting oxygen index increases up to 8%.

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“…This method prevents volatilization or migration of the combustion inhibitor to the surface of the material [ 7 , 8 ]. The most popular and promising substances used in recent years to obtain polyurethanes with improved thermal stability and flame retardancy are metal compounds [ 5 , 9 , 10 ], melamine and its derivatives [ 11 ], boron compounds [ 12 ], polyhedral oligomeric silsesquioxanes [ 13 ], functionalized graphene oxide [ 14 , 15 ], expanded graphite [ 16 ], carbon nanotubes [ 17 ] and phosphorus-containing substances. Due to environmental and health aspects, some halogenated substances, e.g., brominated and chlorinated compounds, are excluded from use, despite their high effectiveness [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors

2021

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Phosphorus-containing polyol applications in polyurethane synthesis can prevent volatilization of flame retardants and their migration on the surface of a material. In this work, novel cast polyurethanes were prepared by a one-step method with the use of different amounts of phosphorus-containing polyol, 4,4′–diphenylmethane diisocyanate and 1,4-butanediol. The chemical structure, thermal, physicochemical and mechanical properties and flame resistance of the prepared materials were investigated. The results obtained for cast flame-retarded polyurethanes were compared with cast polyurethane synthesized with commonly known polyether polyol. It has been shown that with an increasing amount of phosphorus content to polyurethane’s chemical structure, an increased flame resistance and char yield were found during combustion tests. Phosphorus polyol worked in both the condensed (reduced heat and mass exchange) and gas phase (inhibition of flame propagation during burning). The obtained materials contained phosphorus polyol, indicating higher thermal stability in an oxidative environment than an inert atmosphere.

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Synergistic effect between zeolitic imidazolate framework‐8 and expandable graphite to improve the flame retardancy and smoke suppression of polyurethane elastomer

Cited by 20 publications

References 51 publications

Metal‐organic frameworks derived ZnO@MOF@PZS flame retardant for reducing fire hazards of polyurea nanocomposites

Metal‐organic frameworks derived ZnO@MOF@PZS flame retardant for reducing fire hazards of polyurea nanocomposites

Flame retardancy and thermal properties of poly(butylene succinate)/ nano‐boehmite composites prepared via in situ polymerization

Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors

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