Fig. 3.

Flame retardancy and mechanical property of p–n segmented core–shell TE fibers. a Flame-retardant performance of p–n segmented TE fiber with and without MMT, respectively. b SEM images of p–n segmented TE fiber before and after being exposed to flame for 3 s. c LOI values of pure ANFs aerogel fiber, ANFs/MMT aerogel fiber, n-segment, p-segment and p–n segmented TE fibers. d TG and DTG curves of pure ANFs aerogel fiber and ANFs/MMT aerogel fiber in a nitrogen atmosphere. e HRR and f THR curves of pure ANFs aerogel fiber and ANFs/MMT aerogel fiber. g Mechanical properties and h typical stress–strain curves of n-segment, p-segment and p–n segmented TE fibers. i Diagram of typical properties (including conductivity, diameter, tensile strength, porosity, knittability and flexibility) of p–n segmented TE fiber compared with the previously reported aerogel fiber [46, 48, 50, 52, 53]