The Effect of Nano-TiO<,2> on Ultraviolet Stability of Poly (p-phenylene Benzobisoxazole) Fiber
Poly (p-phenylene benzobisoxazole) (PBO)/titanium oxide (TiO<,2>) nanocomposites were first prepared by in-situ polymerization and the fibers had been successfully spun via dry-jet wet spinning technique. The weathering behavior of the fibers was investigated after being exposed under ultraviolet radiation for up to 100 hours. The results indicated that the pure PBO showed a large deterioration in mechanical properties, as a consequence of chemical degradation that resulted in chain scission reactions and surface deterioration. Slight content (0.3％wt) of TiO<,2> confirmed the protecting action of this additive in PBO fiber, and in the initial exposure time tensile strength droped slowly after 0.3％wt and 1.5％wt TiO2<,2> adding in polymer, also the protecting effect improveed with the content of TiO2 <,2> increased. However, from the observation of SEM image, nano-TiO<,2> facilitated surface cracking in PBO/TiO<,2> 1.5％ fiber as the exposure time reached 40hr due to the anatase crystal part of TiO<,2>. Compared with the changes of tensile strength and intrinsic viscosity, it also could be concluded that surface deterioration took more important roles than macromolecule weigh decrease in the photodegradation of PBO and composites under UV exposure.
Poly (p-phenylene benzobisoxazole) titanium oxide nanocomposites ultraviolet photodegradation
ZHU Huijun JIN Junhong LI Guang JIANG Jianming YANG Shenglin
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
国际会议
上海
英文
967-969
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）