A Supported Catalyst that Enables the Synthesis of Colorless CO2-Polyols with Ultra-Low Molecular Weight |
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Authors: | Qingxian Kuang Ruoyu Zhang Zhenzhen Zhou Can Liao Prof Dr Shunjie Liu Prof Dr Xuesi Chen Prof Dr Xianhong Wang |
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Institution: | 1. Key Laboratory of Polymer Ecomaterial, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China
University of Science and Technology of China, Hefei, 230026 China;2. Key Laboratory of Polymer Ecomaterial, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China |
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Abstract: | Ultra-low molecular weight (ULMW) CO2-polyols with well-defined hydroxyl end groups represent useful soft segments for the preparation of high-performance polyurethane foams. However, owing to the poor proton tolerance of catalysts towards CO2/epoxide telomerization, it remains challenging to synthesize ULMW yet colorless CO2-polyols. Herein, we propose an immobilization strategy of constructing supported catalysts by chemical anchoring of aluminum porphyrin on Merrifield resin. The resulting supported catalyst displays both extremely high proton tolerance (≈8000 times the equivalents of metal centers) and independence of cocatalyst, affording CO2-polyols with ULMW (580 g mol−1) and high polymer selectivity (>99 %). Moreover, the ULMW CO2-polyols with various architectures (tri-, quadra-, and hexa-arm) can be obtained, suggesting the wide proton universality of supported catalysts. Notably, benefiting from the heterogeneous nature of the supported catalyst, colorless products can be facilely achieved by simple filtration. The present strategy provides a platform for the synthesis of colorless ULMW polyols derived from not only CO2/epoxides, but also lactone, anhydrides etc. or their combinations. |
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Keywords: | Aluminum Porphyrin CO2-Polyols Immobilization Multiple Cooperation Ultra-Low Molecular Weight |
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