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Rapid monitoring of bisphenol - A diglycidyl ether formation through byproduct estimation: A study by Fourier transform infra-red spectroscopy

机译:通过副产物估算快速监测双酚-二缩水甘油醚的形成:傅里叶变换红外光谱法的研究

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摘要

For identification and quantification of desired and undesired products during epoxy resin formation, polymerization of bisphenol-A with the stoichiometric excess of epichlorohydrin is carried out using catalytic excess of alkali. The reaction is monitored using Fourier transform infra-red (FT-IR) spectroscopy technique. Major undesired products are unreacted monomers (bisphenol-A and epichlorohydrin) and byproducts (chlorine and α-glycol substituted diglycidal ether of bisphenol-A), whereas the desired product is only diglycidal ether of bisphenol-A. Molar concentrations of epichlorohydrin, bisphenol-A, diglycidal ether of bisphenol-A, chlorine substituted resin, and α-glycol substituted resin in the polymerization mixture are analyzed and quantified using FT-IR characteristic frequency bands at 925, 3448, 1344, 773, and 3641 cm~(-1), respectively. For optimal determination of process parameters on polymerization, effect of temperature and alkali loading on epoxy polymerization is carried to maximize the yield of diglycidal ether of bisphenol-A with simultaneous minimizing the byproducts formation.
机译:为了在环氧树脂形成过程中鉴定所需产物和不希望有的产物,使用催化过量的碱进行双酚-A与化学计量过量的表氯醇的聚合。使用傅立叶变换红外(FT-IR)光谱技术监控反应。主要不希望的产物是未反应的单体(双酚A和表氯醇)和副产物(双酚A的氯和α-乙二醇取代的二缩水甘油醚),而所需的产物仅仅是双酚A的二缩水甘油醚。使用FT-IR特征频带在925、3448、1344和773处分析和量化聚合混合物中表氯醇,双酚A,双酚A的二缩水甘油醚,氯取代的树脂和α-乙二醇取代的树脂的摩尔浓度和3641 cm〜(-1)。为了最佳地确定聚合过程中的工艺参数,温度和碱负荷对环氧聚合反应的影响可以最大化双酚A的二缩水甘油醚的收率,同时最大程度地减少副产物的生成。

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