1：Experimental Design and Method Selection:

The study used photoacoustic calorimetry (specifically the open photoacoustic cell method) and photopyroelectric techniques (front-detection configuration) to measure thermal properties. Theoretical models and equations were applied for data fitting.

2：Sample Selection and Data Sources:

A PPy/PLA composite membrane was fabricated using polylactic acid filament from Makerbot, polypyrrole powder from Sigma-Aldrich, and N,N-Dimethylformamide from Sigma-Aldrich. The molar composition was PPy/PLA/DMF ≈

3：

1:

4：List of Experimental Equipment and Materials:

Equipment included an open photoacoustic cell with an electret microphone, a modulated laser beam, a lock-in amplifier (model SR850), a photopyroelectric setup with a PVDF pyroelectric detector, an ultrasonic cleaner bath, and scanning electron microscopy (SEM) for morphological analysis. Materials included PLA filament, PPy powder, DMF, organic oil for thermal contact, and vacuum grease.

5：Experimental Procedures and Operational Workflow:

The composite was fabricated by dissolving PLA in DMF, mixing with PPy, sonicating, and depositing on a glass substrate to dry. For thermal diffusivity, the sample was placed on the microphone, illuminated with modulated laser light, and the signal was measured. For thermal effusivity, the sample was placed on the PVDF detector with oil, and frequency scans were performed. Data were normalized and fitted to theoretical equations.

6：Data Analysis Methods:

Data were analyzed using fitting procedures to theoretical equations (e.g., Eq. 1 for thermal diffusivity and Eq. 2 for thermal effusivity) to extract thermal parameters. Thermal conductivity and heat capacity were calculated from the relationships with diffusivity and effusivity.