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Simultaneous polymerization and crystallization of aniline

机译：苯胺的同时聚合和结晶

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By varying the oxidant to aniline molar ratio from as low as 1/1000 to 1/20 in the presence of concentrated HCl it has been possible to simultaneously polymerize and crystallize aniline at room temperature. The crystals of polyaniline (PANi) have been characterized using several instrumental techniques. FTIR analysis has been done to identify the characteristic peaks of PANi. The FTIR peaks are well resolved and shows good agreement with the reported peaks in literature. Gel permeation chromatography (GPC) has been done to estimate the degree of polymerization and the molecular weight distribution. GPC results confirm that the polymerization is taking place even at very low concentrations of oxidant. ~1H NMR spectra have been recorded to confirm the polymerization of aniline to PANi. Wide angle X-ray diffractograms have been recorded to determine the percentage crystallinity. WAXD results show a very high degree of crystallinity of approx 95-98 percent. Optical microscope images reveal a characteristic needle-like feature of growth in the initial stages which then grows into single-crystal like triangular flakes with large overgrowths and hence shows polycrystalline nature.
机译：通过在浓HCl存在下将氧化剂与苯胺的摩尔比从低至1/1000改变为1/20，可以同时在室温下使苯胺聚合和结晶。聚苯胺（PANi）的晶体已经使用几种仪器技术进行了表征。进行了FTIR分析以识别PANi的特征峰。 FTIR峰的分离度很好，并且与文献中报道的峰显示出良好的一致性。已经进行了凝胶渗透色谱法（GPC）以估计聚合度和分子量分布。 GPC结果证实，即使在非常低的氧化剂浓度下，聚合反应仍在进行。记录了〜1H NMR光谱，以确认苯胺聚合成PANi。已记录了广角X射线衍射图以确定结晶度百分比。 WAXD结果显示出很高的结晶度，约为95-98％。光学显微镜图像揭示了在初始阶段生长的特征性的针状特征，然后其生长成具有大量过度生长的单晶状三角形薄片，因此显示出多晶性质。

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