Reaction of ozone with polybenzimidazole (PBI)
Reaction of ozone with polybenzimidazole (PBI)
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DOI：
10.1080/01919512.2018.1446127
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发表时间：
2018-03
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影响因子：
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通讯作者：
O. Omar;B. Ha;Katerine Vega;A. Fleischer;Hyukin Moon;Joel Shertok;A. Bailey;M. Mehan;Surendra K. Gupta;G. Takacs
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文献类型：
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作者：
O. Omar;B. Ha;Katerine Vega;A. Fleischer;Hyukin Moon;Joel Shertok;A. Bailey;M. Mehan;Surendra K. Gupta;G. Takacs
摘要臭氧与聚苯并咪唑(PBI)膜表面发生反应，X-射线光电子能谱(XPS)检测到氧原子浓度迅速增加，达到27±1原子%的饱和水平。原子力显微镜测量表明，表面粗糙度几乎没有变化。与未经处理的PBI膜相比，处理膜的水接触角降低了约60%，这表明由于形成了极性含氧官能团，亲水性和氢键增加。XPS化学状态的曲线拟合显示，C-C SP2、C-C SP3和C=N官能团减少，而C-N、C=O、O-C=O、O-(C=O)-O和N-C=O部分增加，这可以用与臭氧加入到C=C和C=N键上形成的初级臭氧解离以及与PBI中的胺基反应有关的机制解释。用水清洗处理后的表面部分地洗掉了氧浓度，这表明由于初级臭氧分解过程中键的断裂而形成了弱边界层。
ABSTRACT Ozone reacted with the polybenzimidazole (PBI) film surface and X-ray photoelectron spectroscopy (XPS) detected a rapid increase in O atom concentration up to a saturation level of 27 ± 1 atomic %. Atomic force microscopy measurements showed little change in surface roughness. The water contact angle of the treated film decreased by ca. 60% compared to untreated PBI film indicating an increase in hydrophilicity and hydrogen bonding due the formation of the polar oxygenated functional groups. With treatment, the curve fitting of the XPS chemical states showed a decrease in the C–C sp2, C–C sp3, and C=N functional groups, and an increase in C–N, C=O, O–C=O, O–(C=O)–O, and N–C=O moieties which were explained using mechanisms associated with the dissociation of the primary ozonide formed from the addition of ozone to the C=C and C=N bonds and reaction with the amine groups in PBI. Washing the treated surface with water partially washed away the O concentration which indicated the formation of a weak boundary layer due to the breakage of bonds in the decomposition of the primary ozonide.