Thermodynamic and kinetic considerations: effect of $beta;-cyclodextrin on methyl methacrylate dispersion polymerization

This article presents a work aiming at thermodynamically and kinetically interpreting the specific sorption and recognition by a molecularly imprinted polymer. Using Boc-L-Phe-OH as a template, the imprinted material was prepared. The result indicates that the prepared polymer can well discriminate the imprint species from its analogue (Boc-D-Phe-OH), so as to adsorb more for the former but less for the latter. Kinetic analysis indicates that this specific sorption, in nature, can be a result of a preferential promotion. The imprint within the polymer causes a larger adsorption rate for the template than for the analogue. Thermodynamic study also implies that the molecular induction from the specific imprint to the template is larger than to the analogue, which thus makes the polymer capable of preferentially alluring the template to bind.

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“…As already known, the extent to a chemical process can be closely associated with a changing chemical-potential [19,20]:

μ = μ^{φ} + R T ln \frac{C}{C^{φ}}

…”

Section: Resultsmentioning

confidence: 99%

Molecularly Imprinted Polymers: Thermodynamic and Kinetic Considerations on the Specific Sorption and Molecular Recognition

Huang

Zheng

et al. 2008

Sensors

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“…This may be explained by the increased monomer reactivity in the presence of HP-b-CD. 18 Ritter and coworkers 30 have reported on the use of CD complex to polymerize styrene in water, where a stable polymer latex was formed and the polymer particles had a narrow size distribution. In our work, we tried to obtain a stable latex by changing the polymerization conditions.…”

Section: Comparison Of the Photo-and Thermal-induced Polymerizationsmentioning

confidence: 99%

“…17 Undoubtedly, polymerizations in water have some advantages over those in organic solvents. Moreover, Songjun Li et al 18 reported that the formation of a monomer/CD complex had a significant effect on the reactivity of the guest monomer because the free energy of the monomer was lowered in the presence of CD. It is thus indicated that employing CD not only solubilized the monomer in water, but also increased the reaction efficiency of the monomer.…”

Section: Introductonmentioning

confidence: 99%

Photo‐induced polymerization of methyl methacrylate/cyclodextrin complex in aqueous solution

Deng

et al. 2008

Polymers for Advanced Techs

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Polymerization of hydroxypropyl-b-cyclodextrin (HP-b-CD) complex of methyl methacrylate (MMA) (MMA/HP-b-CD) was carried out under UV irradiation in aqueous solution with Irgacure 2959 (4-(2-hydroxyethoxy)phenyl-(2-hydroxy-2-propyl)ketone) as a photoinitiator at room temperature. The effects of some principal factors, including UV irradiation intensity, initiator concentration, and the ratio of HP-b-CD to MMA, on the polymerization were investigated in detail. Compared to the corresponding thermal polymerization, photo-induced polymerization of the MMA/HP-b-CD complex could be accomplished at a higher speed; the polymerization conversion in photo-induced polymerization reached 94% within 30 min, while it was only 62% for the thermal polymerization of 16 hr at 70-C. The number-average molecular weight (M n ) and polymerization conversion decreased with the increase in UV intensity and initiator concentration. The resulting PMMA precipitated spontaneously from the solution during polymerization in the absence of any precipitator. About 95 wt% of the HP-b-CD remained in the solution after polymerization and the reusability of the residual HP-b-CD was experimentally demonstrated. 1654 J. Deng et al.to prove that HP-b-CD is innocuous to human beings and to the environment. 31 This means that HP-b-CD can be used as an environment-friendly material. According to the present investigation, polymerization based on hydrophobic monomer/HP-b-CD complex and via photoinitiation is expected to find some practical applications in the synthesis of polymers.

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Thermodynamic and kinetic considerations: effect of $beta;-cyclodextrin on methyl methacrylate dispersion polymerization

Cited by 2 publications

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Molecularly Imprinted Polymers: Thermodynamic and Kinetic Considerations on the Specific Sorption and Molecular Recognition

Molecularly Imprinted Polymers: Thermodynamic and Kinetic Considerations on the Specific Sorption and Molecular Recognition

Photo‐induced polymerization of methyl methacrylate/cyclodextrin complex in aqueous solution

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