期刊
POLYMER
卷 249, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.124841
关键词
Nitroxide-mediated radical polymerization; Molecularly imprinted materials; Adsorption isotherms
资金
- PHC Utique~program for French-Tunisian cooperation [19G1204]
This study investigates the origin of the improved performance of Molecular Imprinted Polymers (MIPs) prepared by Nitroxide-Mediated Radical Deactivation Reversible Polymerization (NMRP) and by conventional Free Radical Polymerization (FRP). The study reveals that the enhanced adsorption of NMRP MIPs is due to a higher density of molecular imprints rather than a higher affinity. Additionally, hydrogen bonding between the MIP carboxylic acids and the target molecule is found to be the main contribution to adsorption.
The origin of the improved performance of Molecular Imprinted Polymers (MIPs) prepared by NitroxideMediated Radical Deactivation Reversible Polymerization (NMRP) and by conventional Free Radical Polymerization (FRP) was investigated through a detailed interpretation of adsorption onto imprinted- and non-imprinted materials. MIPs designed for the adsorption of 3,5-dichlorohydroxyacetophenone (DCHA) were copolymers of methacrylic acid and styrene cross-linked by ethylene glycol dimethacrylate. Modelling the adsorption isotherms using the Langmuir-Volmer model showed that the enhanced adsorption to NMRP MIP was due to a higher density of molecular imprints rather than a higher affinity of the molecular imprints for DCHA. Adsorption was exothermic onto molecular imprints and athermal off them; adsorption caused an increase of entropy. The interactions between monomer and DCHA measured in solution and the influence of pH on adsorption pointed out hydrogen bonding between the MIP carboxylic acids and the DCHA phenol group as the main contribution to adsorption.
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