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. 2024 Sep 23;57(19):9121–9134. doi: 10.1021/acs.macromol.4c01500

Figure 4.

Figure 4

Mechanical properties of selected CPs: elastic stress and COS versus film thickness for (a) P3HT, (b) PDPPT, and (c) PNDI; engineering stress as a function of engineering strain for various film thickness for (d) P3HT, (e) PDPPT, and (f) PNDI, where the inset figures are the linear regions of the stress–strain curves. (g–i) Simulation result. (g) Schematic illustration of uniaxial tension of the polymer thin film. (h) Stress–strain response for thin film with a thickness ∼20 nm for different chain rigidity Krigidity. The elastic modulus is extracted from the slope shown by the dashed lines. (i) Thickness dependence of the elastic modulus of thin film for different Krigidity values. The dashed lines indicate the corresponding modulus in the bulk state. Panels (a) and (d) are adapted with permission from ref (66). Copyright 2018, John Wiley and Sons.