Development and Characterization of High Environmentally Friendly Composites of Bio-Based Polyamide 1010 with Enhanced Fire Retardancy Properties by Expandable Graphite

Abstract

Bio-based polyamide 1010 was melt-compounded with different percentages (2.5 to 10.0 wt.%) of expandable graphite (EGr) as an environmentally friendly solution to improve the flame retardancy properties. The mechanical, morphological, thermal and fire retardancy properties (among others) are analysed. The novelty of the article lies in the use of fully removable polyamide. The effect of the incorporation of EGr in the properties of this polymer was analysed and characterised. The incorporation of EGr into the PA1010 matrix led to very promising results. Mechanically, the EGr provided increased stiffness and a tensile strength up to 7.5 wt.%, verifying good mechanical performance. The DMTA results also show how the incorporation of EGr in the PA1010 matrix clearly increases the stiffness of the composites over the entire temperature range analysed. In terms of physical properties, water absorption of PA1010 was reduced particularly in the 10% EGr, which reduces the water absorption of PA1010 by 20%. In terms of flame retardant properties, with the incorporation of EGr, a significant reduction in the heat release rate (HRR) values as the concentration of the additive increases and a reduction in the maximum peak heat release rate (pHRR) can be observed for all compounds. In particular, it goes from 934 kW/m2 for neat polyamide to a value of 374 kW/m2 with 10% EGr. Finally, an improvement in the UL-94 rating of the 7.5 and 10% EGr composites was also observed, going from V-2 in the PA to V-1 in these composites.

Effect of addition of fillers (MoS2 and PFA) on the tribological and mechanical properties of biobased semi‐aromatic polyamide (PA10T)

“…Additionally, the crystallization peaks become broader and lower. It is worth noting that when the fillers content reaches 10 wt%, all PA10T‐FM composites exhibit higher T onset , T c , and T m than pure PA10T 36 . This indicates that the addition of fillers promotes crystallization performance and effectively enhances the melting temperature of PA10T.…”

“…It is worth noting that when the fillers content reaches 10 wt%, all PA10T-FM composites exhibit higher T onset , T c , and T m than pure PA10T. 36 This indicates that the addition of fillers promotes crystallization performance and effectively enhances the melting temperature of PA10T. These findings suggest that incorporating fillers (MoS 2 and PFA) not only improves the wear resistance of PA10T but also enhances its crystallization properties and melting points effectively.…”

Incorporation of Argan Shell Flour in a Biobased Polypropylene Matrix for the Development of High Environmentally Friendly Composites by Injection Molding

“…Other authors, like Hosseinihashemi et al [ 51 ], also observed this effect in composites prepared by blending PP with almond byproducts. In addition, the presence of a filler induces a stress concentration effect that promotes crack formation, and as a result, the energy absorption of the composites is reduced [ 52 ].…”

The Structural Evolution and Mechanical Properties of Semi-Aromatic Polyamide 12T after Stretching

“…Semi-aromatic polyamides are important engineering plastics with excellent comprehensive properties, as shown in Table S1 in the supporting information [1][2][3][4][5][6][7]. Polydodecanediamine terephthalamide (PA12T) is a new kind of semi-aromatic polyamide polymerized from 1,12-dodecanediamine (DA12) and terephthalic acid (PTA) [1,8].…”