1：Experimental Design and Method Selection:

The study involved synthesizing rutile TiO2 nanorods via hydrothermal method, encapsulating them with SiO2 to reduce photocatalytic activity, and functionalizing with an antioxidant using an aminosilane coupling agent (KH550). Melt blending was used to incorporate the nanoparticles into PP matrix. Characterization methods included TEM, SEM, XRD, FTIR, XPS, TGA, DSC, UV-Vis spectroscopy, contact angle measurement, OIT measurement, and photodegradation tests.

2：0). Melt blending was used to incorporate the nanoparticles into PP matrix. Characterization methods included TEM, SEM, XRD, FTIR, XPS, TGA, DSC, UV-Vis spectroscopy, contact angle measurement, OIT measurement, and photodegradation tests. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Materials included titanium trichloride, iron trichloride, TEOS, KH550, antioxidant (3,5-bis(1,1-dimethylethyl)-4-hydroxy benzoic acid), and PP powder without stabilizer. Samples were prepared as films and sheets for testing.

3：List of Experimental Equipment and Materials:

Equipment included internal mixer (HAAKE Polylab OS), plate vulcanizer (Labtech LP-20B), XRD (Rigaku D/max-2500), TEM (HT7700, Hitachi), SEM (SU8020, Hitachi), XPS (ESCA-Lab220i-XL), TGA (Perkin-Elmer Pyris 1), UV-Vis spectrophotometer (Lambda 35, Perkin Elmer), contact angle meter (DSA-100), DSC (Perkin Elmer), UV Crosslinker (CL-1000, UVP LLC), optical microscope (BX53, Olympus), FTIR (Thermo Nicolet 6700). Materials as listed in section 2.

4：0). Materials as listed in section Experimental Procedures and Operational Workflow:

1. 4. Experimental Procedures and Operational Workflow: Synthesis of TiO2 nanorods, SiO2 coating, functionalization with KH550 and antioxidant, melt blending with PP, pressing into films/sheets, and various characterizations and stability tests as detailed in sections 2.2 to 2.

5：2 to Data Analysis Methods:

4. 5. Data Analysis Methods: Data analyzed using techniques such as XRD pattern indexing, FTIR peak assignment, XPS elemental analysis, TGA weight loss calculation, OIT measurement via DSC, UV-Vis transmittance, crack observation, and carbonyl index calculation from FTIR spectra.