Abstract

Investigation of the effect of the polymer synthesis method on physicochemical properties of sorbents is one of the topical problems in the chemistry of macromolecular compounds that has high scientific and practical interest. Determination of the optimal synthesis method will make it possible to create sorbents with physicochemical properties that led to the realization of effective sorption. In this work, we investigated the effect of synthesis methods (Pickering emulsion polymerization and precipitation polymerization in solution) of granular polymers based on 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate on physicochemical and sorption properties. The synthesis by Pickering emulsion polymerization led to improvement of the n-propyl alcohol diffusion into the polymer network and to the formation of more homogeneous and structurally stable polymer networks. Creating selective polymer networks by Pickering emulsion polymerization compared to precipitation polymerization in solution led to an increase in porosity, creation of more segregated surface of granules, improvement of binding sites availability at the temperature of 37 °C, and formation of the homogeneous sorption surface with high affinity to target molecules at 25 °C and 37 °C. Selective polymers synthesized by both polymerization methods had the largest values of available sorption surfaces areas for target molecules at 37 °C.

Highlights

  • Sorption materials are widely used in agriculture, industrial production, water treatment, and medicine to extract various impurities, pollutants, toxins, and metabolites [1,2,3], i.e., their use is closely related to environmental protection and public health

  • Polymers based on 2-hydroxyethyl methacrylate (2-HEMA) and ethylene glycol dimethacrylate (EGDMA) surface-imprinted with cholesterol molecules were synthesized by Pickering emulsion polymerization and precipitation polymerization in n-propyl alcohol for selective sorption of cholesterol

  • The formation of granules was due to the method of the polymer synthesis by Pickering emulsion polymerization: when carrying out the polymerization reaction in Pickering emulsions, dispersed polymer-monomer droplets began to stick together, which leads to the formation of cross-linked microglobules

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Summary

Introduction

Sorption materials are widely used in agriculture, industrial production, water treatment, and medicine to extract various impurities, pollutants, toxins, and metabolites [1,2,3], i.e., their use is closely related to environmental protection and public health. Most studies on non-covalent imprinting for the synthesis of molecularly imprinted polymers (MIPs) use the method of radical polymerization with functional and crosslinking monomers containing acrylic and vinyl groups [8,9,10,11,12]. This is due to their variety and availability. The attractiveness of MIPs for practical application is due to such properties as ease of preparation, affinity and selectivity comparable to natural receptors, and low cost Due to these properties, MIPs are increasingly being investigated for further use in various fields, including sensors, preparative sorption, water purification, medicine, etc. MIPs are increasingly being investigated for further use in various fields, including sensors, preparative sorption, water purification, medicine, etc. [13,14,15,16,17,18,19]

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