1：Experimental Design and Method Selection:

The study involved designing and synthesizing two novel polydiacetylenes (NPI-PDA1 and NPI-PDA2) with naphthalimide head groups through self-assembly and topochemical polymerization using UV irradiation. Thermochromic properties were investigated in solid state, PEO-embedded films, and paraffin wax-based pens. Methods included synthesis via condensation reactions, polymerization with UV light, and characterization using various spectroscopic and analytical techniques.

2：Sample Selection and Data Sources:

Diacetylene monomers were synthesized from commercial chemicals like 4-bromo-1,8-naphthalic anhydride, n-butylamine, ethylenediamine, piperazine, and 10,12-pentacosadiynoic acid (PCDA). Samples included powders, PEO films, and wax crayons.

3：List of Experimental Equipment and Materials:

Equipment included Bruker AVANCE III NMR spectrometer, AB Sciex 4000 QTRAP and Bruker micrOTOF-Q mass spectrometers, SolidSpec-3700 UV-vis-NIR spectrophotometer, Shimadzu UV-2600 spectrophotometer, Mettler-Toledo TGA/DSC1 thermal analyzer, Zeiss MERLIN SEM, Horiba Jobin Yovn LabRAM HR-800 Raman spectrometer, UV lamp (254 nm). Materials included solvents like ethanol, DCM, MeOH, PEO, paraffin wax, and various chemicals for synthesis.

4：Experimental Procedures and Operational Workflow:

Synthesis of naphthalimide derivatives and diacetylene monomers, polymerization under UV light, preparation of PEO films by solvent evaporation, fabrication of wax crayons by molding, characterization using NMR, MS, UV-vis, TGA, DSC, SEM, and Raman spectroscopy. Thermochromic tests involved heating and cooling cycles with photography and spectral measurements.

5：Data Analysis Methods:

Data were analyzed using spectroscopic software for UV-vis, Raman, and NMR spectra. Thermal data from TGA and DSC were interpreted for stability and phase transitions. SEM images were analyzed for morphology.