Comparative performance of carbon nanotube and nanoclay on thermal properties and flammability behavior of amorphous polyamide/SEBS blend

Abstract

Multiwall carbon nanotubes (CNT) or montmorillonite clay (MMT‐30B) were added to a poly(hexamethylene isophthalamide‐co‐terephthalamine) (an amorphous polyamide ‐ aPA) and styrene‐ethylene/butylene‐styrene graphitized with maleic anhydride (SEBS) blend, in different concentrations, in order to investigate the morphology, thermal properties and flammability behavior. Different nanoparticle localizations in the phase blend were observed through transmission electronic microscopy. CNT nanoparticles are localized in SEBS phase, and MMT‐30B nanoparticles in aPA phase. No significant changes were observed on transition temperatures and thermal stability with both nanoparticle additions. However, a slight increase on storage modulus for clay nanocomposites and a slight reduction for carbon nanotube nanocomposites were observed, due to their different phase localizations. Regarding flammability, CNT nanocomposites showed better performance as a flame retardant when compared to samples with MMT‐30B. Although the MMT‐30B nanocomposites could not be classified according to the UL‐94 criteria, no dripped flaming particles were observed, due to the a char barrier formation on the polymer surface. The CNT nanocomposites were classified according to the UL‐94 criteria as V‐2. The CNT's selective localization on the SEBS phase decreases its heat‐release rate, but no interconnected network structure was formed in the matrix to suppress the dripping flaming particles.

The effects of nanoclay and carbon nanotube co‐addition on properties of an amorphous polyamide/maleated styrene‐ethylene‐co‐butylene‐styrene blend

“…Besides, the char formed on the 1% CNT sample surface is quite different from that in the samples containing MMT‐30B (Figure 7). In a previous work, [ 22 ] even without the formation of a CNT network structure, a V‐2 classification was obtained for nanocomposites of aPA/SEBS and 0.5% and 1.0% of nanoparticles. The difference between the results obtained there and the ones in the present study can be related to the CNT location on the polymeric blend.…”

“…The difference between the results obtained there and the ones in the present study can be related to the CNT location on the polymeric blend. In the work of Paes et al, [ 22 ] the CNTs were preferentially located in the SEBS phase, which burns first and rapidly. However, in this work, the CNTs were located in the aPA phase (Figure 1D–F).…”

“…The blend used in this work was prepared with a ratio of 80% aPA and 20% SEBS (wt/wt). In our previous work, [ 22 ] the best results for flammability behavior were with 1.0% of nanoparticles, so we used this concentration. We started this research by studying differences in nanoparticles proportion (1:1, 1:2, and 2:1).…”

Effect of magnesium hydroxide and graphene nanoplatelets on the properties of peroxide cross‐linked linear low‐density polyethylene nanocomposite

“…Thus, numerous researchers have reported many studies in the literature and conducted comprehensive review on the combination of conventional FR fillers with a nanomaterial filler into the polymer matrix to improve polymer flame retardancy properties. 37,38 For instance, Chen et al 39 investigated the flame retardancy performance of polypropylene (PP) filled with graphene nanoplatelets (GNP) and MAH and found that increasing GNP content improved flame retardancy property of neat PP. Similarly, the performance of GNP as FR to improve the fire retardant ability of PE/ATH composite has been studied, 19 while Liu 14 reported the study of using PE blended with MAH and montmorillonite (MMT) nanoclay.…”

High-Performance TPE-S Modified by a Flame-Retardant System Based on Black Phosphorus Nanosheets

“…It has the elasticity of rubber at room temperature and plasticity at high temperatures . Moreover, it can be produced by injection molding, extrusion molding, blow molding, and other processing methods. , Due to their excellent aging resistance, insulativity, and mechanical properties, polystyrene-based thermoplastic elastomers (TPE-S) composed of poly­(styrene-ethylene-butylene-styrene) (SEBS), white oil, and polypropylene (PP) are widely used in electric wire and cable, construction, and automobile industries. − However, because of their high flammability, the applications of TPE-S in other industries are greatly limited. Therefore, it is particularly urgent to improve the flame retardancy of the TPE-S.…”