1：Experimental Design and Method Selection:

The synthesis involved condensation polymerization to create poly(azomethine-ester)s (PAZ-E)s with ortho, meta, and para positions. Characterization methods included FTIR, UV-Vis, PL, NMR, GPC, CV, TG-DTA, DMA, DSC, SEM, and AFM to analyze chemical structure, optical, electrochemical, thermal, mechanical, and surface properties.

2：Sample Selection and Data Sources:

Samples were synthesized from chemicals like 4-hydroxybenzaldehyde, o-, m-, p-xylenedibromide, 4-aminophenol, oxalylchloride, and succinylchloride. Solvents included DMF, methanol, acetonitrile, etc., from suppliers like Fluka and Merck Chem. Co.

3：List of Experimental Equipment and Materials:

Equipment included PerkinElmer Spectrum One FTIR, AnalytikJena Specord 210 Plus UV-Vis, Shimadzu RF-5301PC spectrofluorometer, Bruker Avance DPX-400 NMR, Shimadzu 10AVp series HPLC-GPC, CHI 660C Electrochemical Analyzer, Jeol JSM-7100F SEM, WITec Alpha 300 A AFM, Perkin Elmer diamond thermal analysis system for TGA/DSC, and Perkin Elmer Pyris Diamond DMA. Materials included glassy carbon electrode, Ag wire, Pt wire, gold/palladium coating, and polystyrene standards.

4：Experimental Procedures and Operational Workflow:

Synthesis involved two-step condensation: first, reaction of 4-hydroxybenzaldehyde with xylenedibromides to form dialdehydes; second, reaction with 4-aminophenol to form Schiff bases, then with oxalyl/succinyl chloride to form PAZ-Es. Reactions were under argon at 60-150°C, with stirring, filtration, and vacuum drying. Characterization followed standard protocols for each technique, e.g., FTIR at 4000-650 cm?1, UV-Vis in DMF, CV in electrolyte solution, TGA from 10-1000°C, etc.

5：Data Analysis Methods:

Data analysis included calculation of molecular weights (Mn, Mw, PDI) from GPC, band gaps from UV-Vis and CV, thermal parameters from TGA/DSC, mechanical properties from DMA, and surface roughness from AFM. Statistical methods not specified; software tools not mentioned.