scholarly journals An Important Factor Affecting the UV Aging Resistance of PBO Fiber Foped with Nano-TiO2: The Number of Amorphous Regions

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 869
Author(s):  
Jiping Liu ◽  
Xiaobo Liu ◽  
Dong Wang ◽  
Hu Wang

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.

2010 ◽  
Vol 120 (4) ◽  
pp. 2468-2476 ◽  
Author(s):  
Chun-Hua Zhang ◽  
Yu-Dong Huang ◽  
Wen-Jing Yuan ◽  
Jian-Nan Zhang
Keyword(s):  
Uv Aging ◽  
Nano Zno ◽  

2009 ◽  
Vol 48 (9) ◽  
pp. 945-949 ◽  
Author(s):  
Changqing Fang ◽  
Maorong Zhang ◽  
Zengping Zhang ◽  
Shisheng Zhou

2017 ◽  
Vol 28 (11) ◽  
pp. 115709 ◽  
Author(s):  
Chao Chen ◽  
Wei Wu ◽  
William Z Xu ◽  
Paul A Charpentier

2014 ◽  
Vol 12 (9) ◽  
pp. 2987-2996 ◽  
Author(s):  
A. Erdem ◽  
D. Metzler ◽  
D. Cha ◽  
C. P. Huang
Keyword(s):  

2010 ◽  
Vol 152-153 ◽  
pp. 136-143
Author(s):  
Yu Ying Xiong ◽  
Cui Fen Liang ◽  
Hua Xiao ◽  
Jian Wen Xiong

Fe-doped TiO2 was prepared by a homogenous precipitation method and characterized by XRD, UV-Vis DRS. The structure and the optical properties of nano-TiO2 with different Fe doping content were studied, as well as the effect and the possible mechanics of different intensity of TiO2 particles, Fe-doped nano-TiO2 particles on the activity of HL60 leukemic cells. The influence on the activity of cells exposures in light compared with un-exposure also be analysed. As the photo sensitizers, TiO2 and Fe-doped TiO2 particles eliminated tumor cell using photodynamic therapy(PDT)under magnetic field.


2021 ◽  
Vol 28 (5) ◽  
pp. 1523-1530
Author(s):  
Daosheng Liu ◽  
Xingrong Chen ◽  
Zhengyang Guo ◽  
Jing Ye ◽  
Ziming Zhao ◽  
...  

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