Molecularly imprinted polymers(MIPs) were synthesized by using derivatives of benzoic acid and ethyl benzoate as the templates. The paper aims at studying the effect of the different functional groups on the imprintin...Molecularly imprinted polymers(MIPs) were synthesized by using derivatives of benzoic acid and ethyl benzoate as the templates. The paper aims at studying the effect of the different functional groups on the imprinting process by summarizing the chromatographic data,and the relationship between the imprinting interaction and the solvents used during the polymerization was discussed. The experimental results show that the structure of the template plays a decisive role in imprinting effect,and imprintogenicity can be improved by changing solvent and monomer for the template. In addition,when carboxy group is replaced by ester group,the templates would lose their imprinting effect completely in acetonitrile;if chloroform is used as porogen,the imprintogenicity of ethyl p-aminobenzoate and ethyl p-hydroxybenzoate will evidently be improved. The result indicates that the solvents used during the polymerization have a great influence on whether the groups of the template can act as effective imprinting groups. Therefore,the solvents should be taken into account in designing the experiments or in theoretical prediction of the imprinting effect of the templates. [WT5HZ]展开更多
This paper presents experimental observations on the adsorption of individual solutes by a simple thermodynamic framework, and the equilibrium adsorption of ethyl benzoate and diethyl phthalate on phenolic resin adsor...This paper presents experimental observations on the adsorption of individual solutes by a simple thermodynamic framework, and the equilibrium adsorption of ethyl benzoate and diethyl phthalate on phenolic resin adsorbent in hexane solutions within the temperature range of 293-313 K. The experimental results show that the Freundlich adsorption law is applicable to the adsorption of ethyl benzoate and diethyl phthalate on the adsorbent, since all the correlative factors R' are larger than 0.99. The negative values of all the isosteric adsorption enthalpies for ethyl benzoate and diethyl phthalate indicate that they undergo exothermic processes, while their magnitudes (19-28 kJ/mol) manifest a hydrogen bonding sorption process. Other thermodynamic properties: the free energy changes and the entropy change associated with the adsorption have been calculated from the Gibbs adsorption equation and the Gibbs-Helmholtz equation展开更多
文摘Molecularly imprinted polymers(MIPs) were synthesized by using derivatives of benzoic acid and ethyl benzoate as the templates. The paper aims at studying the effect of the different functional groups on the imprinting process by summarizing the chromatographic data,and the relationship between the imprinting interaction and the solvents used during the polymerization was discussed. The experimental results show that the structure of the template plays a decisive role in imprinting effect,and imprintogenicity can be improved by changing solvent and monomer for the template. In addition,when carboxy group is replaced by ester group,the templates would lose their imprinting effect completely in acetonitrile;if chloroform is used as porogen,the imprintogenicity of ethyl p-aminobenzoate and ethyl p-hydroxybenzoate will evidently be improved. The result indicates that the solvents used during the polymerization have a great influence on whether the groups of the template can act as effective imprinting groups. Therefore,the solvents should be taken into account in designing the experiments or in theoretical prediction of the imprinting effect of the templates. [WT5HZ]
基金This project was supported by the National Natural Science Foundation of China (No. 29974015).
文摘This paper presents experimental observations on the adsorption of individual solutes by a simple thermodynamic framework, and the equilibrium adsorption of ethyl benzoate and diethyl phthalate on phenolic resin adsorbent in hexane solutions within the temperature range of 293-313 K. The experimental results show that the Freundlich adsorption law is applicable to the adsorption of ethyl benzoate and diethyl phthalate on the adsorbent, since all the correlative factors R' are larger than 0.99. The negative values of all the isosteric adsorption enthalpies for ethyl benzoate and diethyl phthalate indicate that they undergo exothermic processes, while their magnitudes (19-28 kJ/mol) manifest a hydrogen bonding sorption process. Other thermodynamic properties: the free energy changes and the entropy change associated with the adsorption have been calculated from the Gibbs adsorption equation and the Gibbs-Helmholtz equation
