Morphology and properties of filter paper prepared by highly fibrillated poly(p-phenylene benzobisoxazole) fiber

作者：Zhong, Aixin; You, Tianle; Wang, Yi^*; Huang, Ziqi; Liang, Yun; Long, Jin; Tang, Min; Hu, Jian

来源：Textile Research Journal, 2023, 93(13-14): 3262-3274.

DOI：10.1177/00405175221149215

• Poly(p-phenylene benzobisoxazole)
• fibril
• filtration efficiency
• thermal properties

Poly(p-phenylene benzobisoxazole) fiber is a kind of rigid-rod polymer fiber and has a fibrillar structure. It can be fibrillated through a refining process. In this study, the highly fibrillated poly(p-phenylene benzobisoxazole) fiber, which consists of poly(p-phenylene benzobisoxazole) fibrils, was prepared by refining and fractionalizing. It was found that the poly(p-phenylene benzobisoxazole) fibril has a specific surface area of 41.5 m(2)/g, and the diameter can be tens of nanometers. Poly(p-phenylene benzobisoxazole) fibrils can be prepared into the paper by a wet-laid formation process. It was found that the average pore size of poly(p-phenylene benzobisoxazole) paper was 0.64 mu m. The filtration efficiency of poly(p-phenylene benzobisoxazole) paper was 99.96% for particles with a size of 150 nm. After being heated at 400 degrees C for 5 min, the poly(p-phenylene benzobisoxazole) paper could still retain a complete structure and have a filtration efficiency of 99.58%. It is suggested that poly(p-phenylene benzobisoxazole) paper has a potential application in high-efficiency particulate air filters used in air and gas treatment systems in some industrial facilities to resist heated air with a temperature of 400 degrees C.

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