In situ preparation of high performance polyimide nanocomposites based on functionalized multiwalled carbon nanotubes

Figures & data

Scheme 1 Preparation of high performance and organosoluble PI.

Figure 1 FT-IR spectra of acid-functionalized MWCNT (a), PAA (b), pure PI (c), and NC3% (d).

Figure 2 XRD of MWNT, neat polymer, and NC5%.

Figure 3 FE-SEM images of pure PI (a, b), NC1% (c, d), and NC3% (e, f).

Figure 4 TEM images of PI/modified CNT NC3% with different magnifications.

Figure 5 TGA curve of pristine pure PI (a), NC1% (b), NC3% (c), and NC5% (d).

Table 1. Thermal properties of the neat PI and different NCs.

Sample code	T 5 ^a (^oC)	T 10 ^b (^oC)	Char yield^c (%)
PI	406	429	59
NC1%	413	435	62
NC3%	421	450	64
NC5%	428	458	68
^aTemperature at which 5% weight loss was recorded by TGA at heating rate of 10 °C/min under a nitrogen atmosphere.^bTemperature at which 10% weight loss was recorded by TGA at heating rate of 10 °C/min under a nitrogen atmosphere.^cWeight percentage of material left undecomposed after TGA analysis at a temperature of 800 °C under a nitrogen atmosphere.

Figure 6 Representative stress–strain curves for the neat PI (a), NC1% (b), NC3% (b), and NC5% (d).