pH induced regulation of the morphology and properties of polybenzidine submicron rods
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摘要: 以三嵌段共聚物聚丙烯酸正丁酯-b-聚苯乙烯-b-聚二乙烯基吡啶（PnBA28-b-PS75-b-P2VP104）为模板剂制备聚联苯胺，通过调节模板剂胶束溶液的pH值，探究不同pH值对聚联苯胺（PBZ）颗粒形貌及其性能的影响.利用凝胶渗透色谱（SEC）和核磁共振氢谱图（1H-NMR）等测试对三嵌段共聚物PnBA28-b-PS75-b-P2VP104的分子量分布、结构进行了确定.通过扫描微镜（SEM）、透射电镜（TEM）和红外光谱（FT-IR）等测试对材料的形貌、结构进行了表征.利用计时电位测试对材料进行了电化学电容性能的评价.初步探讨了使用不同pH值的模板剂、相同引发剂用量对PBZ形貌、结构和性能的影响.PBZ颗粒呈亚微米级至微米级棒状形貌，分布均匀、表面光滑.pH值为5时，PBZ棒状颗粒的直径大多在几十纳米到200nm之间，随着pH值的增大，样品形貌规整性降低；通过电化学测试可知，pH值为5时PBZ的放电比容量达到339.06 F/g.Abstract: Polybenzidine was prepared using micelles of the triblock copolymer PnBA28-b-PS75-b-P2VP104 as a template. The effects of different pH values on the morphology and properties of polybenzidine (PBZ) were investigated by regulating the pH value of the micellar solution of the templates. The molecular weight distribution and structure of the triblock copolymer PnBA28-b-PS75-b-P2VP104 were determined by size exclusion chromatography (SEC) and nuclear magnetic resonance spectroscopy (1H-NMR). The morphology and structure of the composites were characterized using a scanning electron microscope (SEM), transmission electron microscope (TEM), and Fourier transform infrared spectroscopy (FT-IR). The electrochemical capacitance of the composites was evaluated by chronopotentiometry. The effects of the pH value on the morphology, structure and properties of PBZ were explored in this study. The PBZ particles were submicron and micron rods with uniform distribution and a smooth surface. PBZ rods obtained at pH=5 had an average diameter that ranged from several tens to 200 nm. The uniformity of particle morphologies was found to decrease with an increase in pH value; A electrochemical performance test showed that the specific capacitance of PBZ reached 339.06 F/g at pH=5.
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Key words:
- pH induced regulation /
- polybenzidine /
- lock copolymer template /
- morphology /
- capacitance
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图 3 不同pH值下PBZ与模板复合颗粒的红外光谱图
注: (a) pH=5; (b) pH=6; (c) pH=7; (d) pH=8
Fig. 3 FT-IR spectra of composite particles of polybenzidine with a template at different pH values
图 4 不同pH值下去模板后的PBZ的红外光谱图
注: (a) pH=5; (b) pH=6; (c) pH=7; (d) pH=8
Fig. 4 FT-IR spectra of polybenzidine after removing the template at different pH values
图 5 不同pH值下去模板后的PBZ扫描电镜图
注: (a) pH=5; (b) pH=6; (c) pH=7; (d) pH=8
Fig. 5 SEM images of PBZ after removing the template
图 6 不同pH值下去模板后的PBZ透射电镜图
注: (a) pH=5; (b) pH=6; (c) pH=7; (d) pH=8
Fig. 6 TEM images of PBZ after removing the template
图 7 不同pH值下PBZ去除模板后的计时电位
Fig. 7 Timing potential of PBZ at different pH values after removing the template
表 1 不同pH值的放电比容量
Tab. 1 Discharge capacity at different pH values
pH值 比容量/(F· g-1) 5 339.06 6 297.11 7 162.67 8 258.45 
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