Abstract
Modified nano-TiO2 was prepared by using triethanolamine and tetraisopropyl di (dioctylphosphate) titanate, respectively. Then the poly(p-phenylene benzobisoxazole) (PBO) fibers doped with different additions of modified nano-TiO2 particles were prepared by preparing PBO polymer solution and dry-jet wet spinning technique. Thermogravimetric and derivative thermogravimetry results showed that the addition of nano-TiO2 could improve the crystallinity and maximum thermal decomposition rate temperature of PBO fibers. Tensile strength results showed that nano-TiO2 addition did not affect the tensile properties of PBO fibers before ultraviolet (UV) aging began, and nano-TiO2 with addition values lower than 3% could improve the UV aging resistance performance of PBO fibers, while the aging resistance would be seriously reduced if values were over 5%. The size and quantity of the amorphous regions have a more important influence on the aging resistance of PBO fibers.
Highlights
Poly(p-phenylene benzobisoxazole) (PBO) fiber, a kind of rigid-rod isotropic crystal polymer, has excellent thermal stability, solvent resistance, remarkable tensile strength, and modulus [1,2,3].PBO fiber known as a sort of synthesis material has become prominent in high strength applications, such as body armor, ropes and cables, and recreational equipment [4]
In this research, modified nano-TiO2 was prepared by using TEA and tetraisopropyl di (dioctylphosphate) titanate (TDT), respectively
The PBO fibers doped with different content modified nano-TiO2 particles were prepared by preparing
Summary
Poly(p-phenylene benzobisoxazole) (PBO) fiber, a kind of rigid-rod isotropic crystal polymer, has excellent thermal stability, solvent resistance, remarkable tensile strength, and modulus [1,2,3].PBO fiber known as a sort of synthesis material has become prominent in high strength applications, such as body armor, ropes and cables, and recreational equipment [4]. Aging resistance performance of PBO is poor. PBO fiber was sensitive to UV light exposure, which could cause chemical, physical and mechanical properties changes. Many studies have attempted to improve the aging resistance of PBO fiber [7,8,9,10]. Among them, introducing anti-ultraviolet agents received a great deal of attention [11,12,13]. As a strong UV absorber, nano-TiO2 has perfect versatility in optical, electrical, and photochemical properties [14,15,16,17], and can improve the resistance to UV aging of PBO fiber [18]. The compatibility of PBO fibers with titanium dioxide particles is poor, and cracks and defects are produced at the interface between them
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