1：Experimental Design and Method Selection:

The study involved synthesizing poly(aryl acetal) polymers using an optimized Suzuki polycondensation protocol. The design included acid-labile acetal linkages in the backbone and side chains, with a rigid polyaromatic framework for high Tg and free phenolic groups for adhesion and hydrophobicity modulation.

2：Sample Selection and Data Sources:

Monomers such as formaldehyde diphenylacetal, acetaldehyde diphenylacetal, and benzaldehyde diphenylacetal were synthesized from commercial starting materials. Polymers were synthesized with varying degrees of protection (e.g., CHVE protection) and molecular weights.

3：List of Experimental Equipment and Materials:

Equipment included NMR spectrometers, LC-MS systems, GPC for molecular weight analysis, DSC and TGA for thermal properties, and EUV lithography tools for patterning. Materials included various boronic esters, dibromophenols, catalysts like (t-Bu)3Pd(crotyl)Cl, bases like tripotassium phosphate, solvents like 1,4-dioxane and PGMEA, and acids like trifluoroacetic acid.

4：Experimental Procedures and Operational Workflow:

Monomer synthesis followed specific schemes (e.g., Scheme 2 for bisboronates). Polymerization was optimized with catalyst/base combinations, conducted in stages for random copolymerization, and included end-capping steps. Acid degradation studies were performed using NMR and LC-MS. Lithographic testing involved spin-coating formulations on silicon wafers and exposure to EUV light for patterning.

5：Data Analysis Methods:

Molecular weights were determined by GPC, acid degradation kinetics by NMR integration, and lithographic performance by measuring resolution and line width roughness from patterning experiments.