This study demonstrates a streamlined sol-gel strategy for synthesizing TiO2 modified BaSO4 composite particles, aiming to enhance the UV resistance, flame-retardant, and mechanical properties of PVC. The composite was systematically characterized using FT-IR, XRD, SEM, and laser particle size analysis. Results revealed that a TiO2 molar ratio (nTi) of 2.0 mol yielded the most uniform particle size distribution (256-713 nm), along with a maximum settling time of 28.5 h and an activation degree of 82.8 %, which represented increases of 26.0 h and 49.5 %, respectively, over unmodified BaSO4. When incorporated into PVC at 15 wt%, the composite significantly improved material performance: the limiting oxygen index (LOI) reached 27.6 %, Rhodamine B (RhB) photodegradation efficiency attained 70.2 %, and peel strength increased to 151.52 N·mm⁻1, exceeding unmodified PVC by 23.36 N·mm⁻1. Moreover, after 150 h of UV aging, the composite reinforced PVC retained superior mechanical integrity, with only 18.64 % loss in tensile strength and 10.32 % in peel strength. These findings confirm that the TiO2/BaSO4/PVC composite developed here offers a promising combination of enhanced durability and flame-retardant performance.
Qiang Yang, Wei Gong, Chunsheng Zhou and Xiaowei Cui
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