Institute of Bioorganic Chemistry and Petrochemistry, NAS of Ukraine, 50 Kharkivske shose, Kyiv, 02160, Ukraine.
J Phys Chem B. 2013 May 2;117(17):5306-14. doi: 10.1021/jp311898v. Epub 2013 Apr 10.
In this work we find that polyaniline (PANI), synthesized by aniline chemical polymerization at a surface of template polycarbonate (PC) particles, is significantly different in molecular weight, structural order, oxidation state, and conductivity from a neat PANI. Molecular weight of the PANI phase in the composite (Mw = 158,000) is 1.6 times higher than that of the neat PANI synthesized in the absence of the template particles. Moreover, XRD analysis shows that crystallinity of the PANI phase in the composite is three times higher than that of the neat PANI. Raman spectroscopy indicates that the oxidation level of PANI in the PC/PANI composite is lower than that of the neat PANI. These noticeable changes of the PANI phase properties suggest specific interactions of reagents in the polymerization medium and formed PANI with the template phase as well as an orientation effect of the latter surface. FTIR spectroscopy reveals that hydrogen bonding in the neat doped PANI is weaker than one between -NH- of PANI and C═O of PC at their interface. The discovered differences are supported by the fact that conductivity of the PANI phase in the composite is more than three times higher than that of the neat PANI.
在这项工作中，我们发现，通过在模板聚碳酸酯 (PC) 颗粒表面进行苯胺化学聚合合成的聚苯胺 (PANI)，在分子量、结构有序性、氧化态和电导率方面与纯 PANI 有显著的不同。复合材料中 PANI 相的分子量 (Mw=158000) 比在没有模板颗粒存在下合成的纯 PANI 高 1.6 倍。此外，XRD 分析表明，复合材料中 PANI 相的结晶度比纯 PANI 高 3 倍。拉曼光谱表明，PC/PANI 复合材料中 PANI 的氧化态低于纯 PANI。这些 PANI 相性质的明显变化表明聚合介质中的试剂和形成的 PANI 与模板相之间存在特定的相互作用，以及后者表面的取向效应。傅里叶变换红外光谱 (FTIR) 揭示了纯掺杂 PANI 中的氢键比 PANI 中的 -NH-和 PC 中的 C=O 之间的氢键弱。这一发现得到了以下事实的支持：复合材料中 PANI 相的电导率比纯 PANI 高 3 倍以上。
