Fig. 5: Mechanical properties and MD analysis of the orientation enhancement mechanism of C22 fibers with varying CNTs contents during the stretching process.

a Comparison of the tensile strength and elastic modulus of C22 fibers with varying CNTs contents. Data are presented as mean values ± SD, n = 3 independent experiments. b Comparison of the elongation at break and toughness of the C22 fibers with different CNT contents. Data are presented as mean values ± SD, n = 3 independent experiments. c Comparison of the orientation degree, 2D-WAXS images, and FWHMs of the C22 fiber and C22/CNT2 fibers derived from in-situ 2D-WAXS analysis. d Comparison of the orientation degree of C22 fibers with varying CNTs contents at different stretching extents. MD snapshots of the stretching process of (e) C22 fibers at 0 ps, 100 ps (stretching state), 150 ps (partly factured state), and 260 ps (completely factured state), (f) C22 fibers with 6 CNTs (denoted as PCF/CNT1, 0.1 wt.%) at 0 ps (initial state), 100 ps (stretching state), 210 ps (stretching state), and 430 ps (completely fractured state), and (g) C22 fibers with 18 CNTs (denoted as PCF/CNT2, >0.1 wt.%) at 0 ps (initial state), 100 ps (stretching state), 180 ps (partly fractured state), and 350 ps (completely fractured state), respectively. h Mean square displacement curves. i Radial distribution function g(r) curves over time during the stretching process. j Variations in the non-bonding interaction energy of different phase-change composite fiber systems over time during the stretching process. k Property distribution of the different types of PCFs evaluated based on toughness and latent heat storage capacity^{12,27,32,33,39,40,41,42,43,45,46,47,48,49,50,51,53,54,55,59,61,62,63,64,65}.