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首页> 外文期刊>Journal of Applied Polymer Science >Microwave plasma reactions of imidazole on poly(vinyl chloride) surfaces: A spectroscopic study
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Microwave plasma reactions of imidazole on poly(vinyl chloride) surfaces: A spectroscopic study

机译：咪唑在聚氯乙烯表面的微波等离子体反应：光谱研究

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摘要

Although there are various forms of energy available for conducting surface and interfacial reactions, microwave plasma energy is an attractive means for surface modifications because it is fast and it usually does not alter bulk properties. In this study, a closed-system microwave plasma reactor was used to react imidazole molecules to poly(vinyl chloride) (PVC) surfaces. Newly created surfaces were analyzed using attenuated total reflectance (ATR) Fourier-transformed infrared (FTIR) spectroscopy. These studies show that surface reactions on PVC are heavily dependent upon a prior thermal history of the PVC substrate. It appears that the plasma reactions on hot-pressed PVC not only result in the development of CH2 linkages, but a significant increase of crystallinity in the hot-pressed PVC inhibits the reactivity of imidazole to the PVC surface. On the other hand, for a solvent-cast PVC with a significantly lower surface crystalline phase content, imidazole reacts to the PVC surface through C-to-C double bond opening. The amount of imidazole reacted to the PVC surface changes with the depth from the surface. Using quantitative ATR FTIR spectroscopy, imidazole content can be quantified, and its concentrations are in the 10-6 mol/cm2 range at about 0.8-1.2 µm for the PVC surface. A mechanism of the PVC-imidazole reactions is also proposed.
机译：尽管有各种形式的能量可用于进行表面和界面反应，但微波等离子体能是一种有吸引力的表面改性方法，因为它速度快且通常不会改变体积性质。在这项研究中，使用了密闭系统微波等离子体反应器使咪唑分子与聚氯乙烯（PVC）表面反应。使用衰减全反射（ATR）傅里叶变换红外（FTIR）光谱分析新创建的表面。这些研究表明，PVC上的表面反应在很大程度上取决于PVC基材的先前热历史。看来在热压PVC上的等离子体反应不仅导致CH2键的发展，而且热压PVC中结晶度的显着增加也抑制了咪唑对PVC表面的反应性。另一方面，对于具有显着较低的表面结晶相含量的溶剂浇铸PVC，咪唑通过C-C双键打开反应与PVC表面反应。与PVC表面反应的咪唑的量随距表面的深度而变化。使用定量ATR FTIR光谱，可以对咪唑含量进行定量，并且PVC表面的咪唑浓度在10-6 mol / cm2范围内，约为0.8-1.2 µm。还提出了PVC-咪唑反应的机理。

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