Material Characterization of Intumescent Flame Retardant Polyamide 11 Nanocomposites

Koo, Joseph H.; Lao, Si-Chao; Wu, Chris; Tower, Christine; Wissler, G.; Pilato, Louis A.; Llc, Kai; Luo, Zhiping

doi:10.2514/6.2008-1856

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…They achieved a combination of enhanced mechanical and flammability properties of nylon 11 and nylon 12 using a small amount of clay platelets and CNFs. In another study, Koo et al [22] used CNFs, nanoclays, and flame retardant intumescents to improve the flammability and mechanical properties of nylon 11. Several compositions of nanoclay with intumescent and CNF with intumescent were able to obtain UL 94 V-0 ratings.…”

Section: Thermoplastic Polyurethane-cnfs Nanocompositesmentioning

confidence: 99%

Flammability Studies of a Novel Class of Thermoplastic Elastomer Nanocomposites

Koo

Nguyen

Lee

et al. 2009

Journal of Fire Sciences

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The thermal insulation properties of thermoplastic polyurethane elastomer nanocomposites were characterized at different heat fluxes. Thermoplastic polyurethane elastomer was modified with different loadings of montmorillonite nanoclays and carbon nanofibers (CNFs) via twin screw extrusion processing. The addition of nanoparticle into thermoplastic polyurethane elastomer resulted in the formation of a char layer and modified the thermal insulative properties of the material. It was found that thermoplastic polyurethane elastomer with 10 wt% CNFs and with 5 wt% nanoclays gave the best thermal performance with respect to protecting a substrate. The surface temperature of the thermoplastic polyurethane elastomer-clay nanocomposites did not vary much with addition of clay particles while the surface temperature of the thermoplastic polyurethane elastomer-CNF nanocomposites varied more substantially. Some of the trends in surface and substrate temperature measurements with nanomodification can be described using a simple energy balance model that takes into account the basic heat transfer mechanisms.

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Section: Thermoplastic Polyurethane-cnfs Nanocompositesmentioning

confidence: 99%

Flammability Studies of a Novel Class of Thermoplastic Elastomer Nanocomposites

Koo

Nguyen

Lee

et al. 2009

Journal of Fire Sciences

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“…Many strategies have been reported in the literature to reduce the flammability of polyamide 11 (Koo et al, 2008;Lao et al, 2009;Lao et al, 2010b;Hao et al, 2015;Jin et al, 2016;Negrell et al, 2016;Macheca et al, 2017;Sahnoune et al, 2018). Accordingly, halogen-free flame retardants including metal hydroxides, phosphorous and nitrogenous compounds are usually required to achieve good fire performances.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the incorporation of nanofillers such as modified montmorillonite, halloysite, silica and carbon nanofibers to PA11 matrix, offers a promising method to improve its fire properties (Koo et al, 2008;Lao et al, 2010b;Lao et al, 2011;Hao et al, 2015;Macheca et al, 2017;Sahnoune et al, 2018). In this regard, Sahnoune et al (Sahnoune et al, 2018) reported that the addition of 20 wt% of halloysite modified with methyl phosphonic acid led to a better reduction in the peak of heat release rate (pHRR) determined by cone calorimeter test.…”

Section: Introductionmentioning

confidence: 99%

Combined effect of palygorskite and melamine polyphosphate on flame retardancy properties of polyamide 11 nanocomposites

Benobeidallah

Benhamida

Kaci

et al. 2020

Applied Clay Science

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Pyrolysis and fire behaviour of palygorskite (Pal) fibrous clay (5 wt%) reinforced polyamide 11 nanocomposites prepared by melt compounding were investigated in combination with melamine polyphosphate (MPP). Palygorskite was modified by 3-amino-propyl-triethoxysilane (APTES). Thermal stability and combustion behaviour of the materials were studied by thermogravimetric analysis (TGA), pyrolysis combustion flow calorimeter (PCFC) and cone calorimeter. TGA data showed that MPP reduced the thermal stability of PA11 nanocomposites, whereas the addition of both unmodified and modified palygorskite improved this property. Further, the cone calorimeter and PCFC results indicated a significant decrease in the peak of heat release rate (pHRR) and the total heat release (THR) of PA11 nanocomposites. This also means that the PA11 combustion was strongly reduced in the presence of combined Pal with MPP, being however more pronounced for the modified palygorskite. The improved fire behaviour could be attributed to a synergistic effect between Pal and MPP.

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