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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Enhanced Microwave Synthesis: Fine-Tuning of Polyaniline Polymerization
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Enhanced Microwave Synthesis: Fine-Tuning of Polyaniline Polymerization

机译：增强的微波合成：聚苯胺聚合的精细调节

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摘要

A series of energy- and time-efficient enhanced microwave syntheses (EMS) of polyaniline (PANI) have been performed and are discussed herein. The syntheses were performed at different microwave power levels while keeping the reaction system at a constant temperature of 24 ± 1 °C, with the samples extracted after 10 min of reaction. Molecular weights were determined with GPC (gel permeation chromatography) and showed that the molecular weight of the microwave-generated materials depends on applied power: the higher the power level, the greater the molecular weight.The chemical stmcture was investigated by FTIR and UV-vis spectroscopy, while the morphology was imaged using scanning electron microscopy (SEM). FTIR and UV-vis spectroscopy confirmed the formation of PANI, and SEM indicated the presence of a mixed morphology, with a prevalence of nanofibers with different aspect ratios. The conductivity of the samples (ca. 3-3.5 S cm~(1)) was found to be relatively independent of microwave power levels. Surface area measurements were carried out using Brunauer-Emmett-Teller (BET) method, with samples synthesized using EMS showing higher surface areas when compared with conventionally synthesized PANI. The fact that molecular weight depends on applied power implies that microwave-enhanced synthesis can be used to fine-tune PANI reaction conditions, directing it toward specific properties.
机译：已经进行了一系列的聚苯胺（PANI）的能量和时间效率提高的微波合成（EMS），并在本文中进行了讨论。合成是在不同的微波功率水平下进行的，同时将反应系统保持在24±1°C的恒定温度下，反应10分钟后提取样品。用GPC（凝胶渗透色谱法）测定分子量，结果表明微波产生的物质的分子量取决于所施加的功率：功率水平越高，分子量越大。通过FTIR和UV-可见光谱，而形态是使用扫描电子显微镜（SEM）成像的。 FTIR和UV-vis光谱证实了PANI的形成，而SEM则表明存在混合的形态，并且普遍存在具有不同长宽比的纳米纤维。发现样品的电导率（约3-3.5 S cm〜（1））相对独立于微波功率水平。使用Brunauer-Emmett-Teller（BET）方法进行表面积测量，与常规合成的PANI相比，使用EMS合成的样品显示出更高的表面积。分子量取决于施加的功率这一事实表明，微波增强的合成可用于微调PANI反应条件，将其导向特定的性质。

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