Abstract
One pot, solvent free ring opening polymerization (ROP) of propylene oxide (PO) was studied by using lab synthesized heterogeneous double metal cyanide (DMC) catalyst. A series of DMC catalysts was prepared by using EDTA as novel complexing agent (CA) and characterized in detail by PXRD, FT-IR, UV–Vis, 13C CP-MAS NMR, AAS, SEM, XPS, and CHNS analyzer. The suitable amount of CA favored high Zn/Fe ratio and enhanced catalytic activity for polyoxypropylene glycol (PPG) synthesis. It was observed that the properties of PPG are governed by reaction parameters, including catalyst amount, reaction time, temperature, pressure, feed to initiator ratio, and different initiators. The prepared polymers have Mw (160 to 19,667 g mol−1) and PDI (1.05 to 3.01) during optimization. The structure elucidation of PPG was confirmed by FT-IR, GPC, and 1H NMR. Dipropylene glycol (DPG) initiator yielded highest 93% PPG with 1.29 PDI, and 4.9 mg-KOH g−1 hydroxyl value. The kinetics study confirms first-order reaction with proposed coordination mechanism.
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Acknowledgements
The authors are grateful to Director, CSIR-IIP, for his kind permission to publish the results. UK is thankful to CSIR for research funding (OLP-1111). AV and VV acknowledge Department of Science and Technology (DST) for providing INSPIRE research fellowship. SS and BS are grateful to CSIR for the research fellowship. The authors are thankful to Analytical Science Division, CSIR-IIP, for their analytical support.
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Highlights
• Room temperature synthesized double metal cyanide (DMC) catalyst using EDTA as a novel complexing agent (CA).
• Prepared DMC catalyst is effective for PPG synthesis via ring-opening polymerization.
• CA imparts the heterogeneity in the DMC catalyst and recyclability.
• DMC catalyst has higher activity with >99% PPG yield, low PDI (1.05), and low hydroxyl number (4.9 mg-KOH g-1).
• A detailed study of structure reactivity and relationship for PPG synthesis using DMC catalyst.
• A first-order reaction kinetics for PPG synthesis.
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Verma, A., Saini, S., Sharma, B. et al. EDTA incorporated Fe-Zn double metal cyanide catalyst for the controlled synthesis of polyoxypropylene glycol. J Polym Res 30, 62 (2023). https://doi.org/10.1007/s10965-022-03407-6
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DOI: https://doi.org/10.1007/s10965-022-03407-6