Investigation of thermal degradation and flammability of polyamide‐6 and polyamide‐6 nanocomposites

Abstract

In this paper, polyamide-6 and polyamide-6 nanocomposites were prepared by direct melt intercalation technique. The thermal degradation behavior of both polyamide-6 and polyamide-6 clay nanocomposites has been studied. The apparent activation energy of the nanocomposites is almost the same with that of pure polymer under nitrogen, but the apparent activation energy of the nanocomposites is greatly enhanced in air atmosphere. This increasing trend coincides with the thermal analysis and the cone calorimeter results, which may suggest that the polymer/clay nanocomposites have a higher thermal stability and lower flammability. The kinetic analysis also indicates that the pyrolytic degradation and the thermal oxidative degradation of PA6 and PA6/ OMT nanocomposites are two kinds of different reaction models.

Thermal degradation of PC and PA6 during laser transmission welding

“…The Sestak-Beggren and an nth-order model were selected for PC and PA6, respectively. This is consistent with the work of others [19,26,27].…”

“…5 and 6, one can observe that PC's T 0 is higher than that of PA6. This is again consistent with previous research [19,23,24,27]. At temperatures above 550°C, the mass of the PC specimen does not approach zero like that of PA6 but rather a char is formed.…”

“…A number of linear and non-linear [12,15,20] fitting techniques can finally be used to estimate the values of k 0 , E and parameters (i.e., reaction order) associated with the reaction model. A number of kinetic degradation studies have been performed on materials similar to those used in this work [19,[23][24][25][26][27]. For both polycarbonate (PC) and polyamide 6 (PA6), the degradation-initiation temperature (T 0 ) at a given heating rate was dependent on the presence of oxygen in the purge gas [19,25].…”

Effects of reprocessing on the structure and properties of polyamide 6 nanocomposites

“…Other possible degradation reactions in NCs, not observed in this study, are thermo-oxidative degradation [37] and inter-chain reactions [38,39] through recombination of the degrading polymer chains trapped in the gallery space of the clay.…”

Flame retarded polymer nanocomposites: Development, trend and future perspective

“…Besides Nylon [20][21][22][23][24][25][26][27][28][29], polypropylene (PP) [30][31][32][33][34][35][36][37], polystyrene (PS) [33,[38][39][40][41][42][43][44][45], polyethylene (PE) [46][47][48][49][50][51][52], ethylene vinyl acetate copolymer (EVA) [31,[53][54][55][56][57], rubbers [58,59], polymethyl methacrylate (PMMA) [60][61][62][63][64], polyester (PET) [65][66][67][68], polyurethane (PU) …”