1：Experimental Design and Method Selection:

The study involved Sonogashira–Hagihara and Mizoroki–Heck coupling reactions to synthesize and modify polymers. Theoretical models included circular dichroism for helical structure analysis and TD-DFT for UV-vis simulations.

2：Sample Selection and Data Sources:

Prepolymer 1 and various monomers (e.g., 4, 5, a, b, c, d, e) were used, synthesized or obtained commercially. Polymers were characterized using NMR, SEC, CD, UV-vis, PL, TGA, and XPS.

3：List of Experimental Equipment and Materials:

Instruments included JEOL NMR spectrometers (JNM-ECS400, JNM-ECA400), SEC system (Shodex GPC KD-G, Shodex TSK-GEL α-M C0053, JASCO components), JASCO spectropolarimeter (J-800), JASCO spectrophotometer (V-550), SHIMADZU spectrophotometer (RF-6000), SHIMADZU TGA-50, and PHI XPS (5000 VersaProbe III). Materials included DMF, Et3N, PdCl2(PPh3)2, CuI, PPh3, and various monomers.

4：Experimental Procedures and Operational Workflow:

Reactions were conducted under argon at 80°C for 24 hours. Products were precipitated, filtered, and dried. SEC, NMR, CD, UV-vis, PL, TGA, and XPS measurements were performed under specified conditions (e.g., in CHCl3 at room temperature).

5：Data Analysis Methods:

Data were analyzed using SEC for molecular weights, NMR for structural confirmation, CD and UV-vis for helical structure, PL for emission properties, TGA for thermal stability, and XPS for elemental analysis. Statistical analysis included dispersity calculations.