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Catalytic copolymerization reaction of CO2 and propylene oxide over polyalcohols under subcritical conditions

机译:亚临界条件下多元醇催化CO2与环氧丙烷的共聚反应

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摘要

CO2 can be used in copolymerization reactions as a C1 feedstock. Propylene oxide is a perfect candidate for such reaction. Through the mechanism of Ring Opening Polymerization, CO2 can be inserted into the polymer chain. Zinc glutarate (ZnGA) and Zn-Co double metal cyanide (DMC) have been studied as active heterogeneous catalysts for the study. An exhaustive characterization of these catalysts (prepared and used under different conditions) in copolymerization reactions. Catalysts were analyzed by different techniques such as Fourier transform infrared spectroscopy (FTIR and FTIR with pyridine), Inductively coupled plasma optical emission spectrometry, Light scattering, Scanning Electron Microscopy and Energy-dispersive X-ray spectroscopy, N2-physisorption, X-ray photoelectron spectroscopy, X-ray powder diffraction and Thermogravimetric analysis-mass spectrometry. A number of reaction conditions have been tested, demonstrating the effect of pressure, temperature, amount of catalyst, catalyst deactivation and catalyst preparation. The obtained copolymers were analyzed by infrared spectrometry and gel permeation chromatography. High active DMC catalyst (2.5 kg polymer/g catalyst) could be synthetized obtaining 0.4 % of the byproduct cyclic carbonate. This reaction can be the base of a future chemistry to obtain polymers based in bio-alcohols.
机译:二氧化碳可作为C1原料用于共聚反应中。环氧丙烷是该反应的理想选择。通过开环聚合机理,可以将CO2插入聚合物链中。谷氨酸锌(ZnGA)和Zn-Co双金属氰化物(DMC)已作为活性多相催化剂进行了研究。这些催化剂(在不同条件下制备和使用)在共聚反应中的详尽表征。通过不同技术对催化剂进行了分析,例如傅立叶变换红外光谱(FTIR和带有吡啶的FTIR),电感耦合等离子体发射光谱,光散射,扫描电子显微镜和能量色散X射线光谱,N2-物理吸附,X射线光电子光谱,X射线粉末衍射和热重分析质谱。已经测试了许多反应条件,证明了压力,温度,催化剂量,催化剂失活和催化剂制备的影响。通过红外光谱法和凝胶渗透色谱法分析获得的共聚物。可以合成高活性的DMC催化剂(2.5kg聚合物/ g催化剂),得到0.4%的副产物环状碳酸酯。该反应可以作为将来获得基于生物醇的聚合物的化学基础。

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