Surface area and pore structure properties of urethane-based copolymers containing β-cyclodextrin

Wilson, Lee D.; Mohamed, Mohamed H.; Headley, John V.

doi:10.1016/j.jcis.2011.01.081

Cited by 74 publications

(90 citation statements)

References 50 publications

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“…In all cases, there was a sharp elevation in the adsorbed volume for P/P0 > 0.9. This feature is attributable to the presence of high textural (interparticle) porosity [52], and such particle domains represented substantial adsorption of nitrogen for low surface area mesoporous materials [51]. The origin of N2 sorption isotherms of imprinted polymers of MAA-β-CD (Figure 7a-d) exhibited similar trends of Type-IV isotherms and Type H3 hysteresis loops, confirming the mesoporosity of the polymers with the presence of heterogeneous open pores [53].…”

Section: Characterization Of Raft-mips and Mipsmentioning

confidence: 64%

“…According to International Union of Pure and Applied Chemistry (IUPAC), all imprinted polymers synthesized via RAFT and TRP polymerization processes would exhibit Type-IV isotherms with hysteresis loops [50]. Type-IV hysteresis loop features parallel and nearly horizontal branches, attributed to the adsorption/desorption in a narrow slit-like process associated with narrow mesoporous characteristics [51]. In all cases, there was a sharp elevation in the adsorbed volume for P/P0 > 0.9.…”

Section: Characterization Of Raft-mips and Mipsmentioning

confidence: 99%

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Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

2015

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Two types of reversible addition-fragmentation chain transfer molecularly imprinted polymers (RAFT-MIPs) were synthesized using different monomers, which were methacrylic acid functionalized β-cyclodextrin (MAA-β-CD) and 2-hydroxyethyl methacrylate functionalized β-cyclodextrin (HEMA-β-CD), via reversible addition-fragmentation chain transfer (RAFT) polymerization, and were represented as RAFT-MIP(MAA-β-CD) and RAFT-MIP(HEMA-β-CD), respectively. Both RAFT-MIPs were systematically characterized using Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Brunauer-Emmett-Teller (BET), and rebinding experimental study. The results were compared with MIPs synthesized via the traditional radical polymerization (TRP) process, and were represented as MIP(MAA-β-CD) and MIP(HEMA-β-CD). Morphology results show that RAFT-MIP(MAA-β-CD) has a slightly spherical feature with a sponge-like form, while RAFT-MIP(HEMA-β-CD) has a compact surface. BET results show that the surface area of RAFT-MIP(MAA-β-CD) is higher than MIP(MAA-β-CD), while the RAFT-MIP(HEMA-β-CD) surface area is lower than that of MIP(HEMA-β-CD). Rebinding experiments indicate that the RAFT agent increased the binding capacity of RAFT-MIP(MAA-β-CD), but not of RAFT-MIP(HEMA-β-CD), which proves that a RAFT OPEN ACCESSPolymers 2015, 7 485 agent does not always improve the recognition affinity and selective adsorption of MIPs. The usability of a RAFT agent depends on the monomer used to generate potential MIPs.

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Section: Characterization Of Raft-mips and Mipsmentioning

confidence: 64%

Section: Characterization Of Raft-mips and Mipsmentioning

confidence: 99%

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

2015

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“…Nevertheless, the amount of N 2 adsorbed rose sharply at high pressure (P/ P 0 > 0.9) for MIP(MAA-b-CD), which suggested the presence of an appreciably high textural inter-particle porosity in low surface area material. 12,13 Meanwhile, the rapid increase of N 2 adsorbed at high pressure (0.4<P/P 0 <0.9) for MIP(MAA) revealed a delayed condensation, which indicated a small pore size homogenous polymer. 24 A BJH pore size distribution plot [ Figure 2(c)] produced from the desorption isotherms demonstrated the presence of differences in pore size distributions between the MIP(MAA-b-CD) and MIP(MAA).…”

Section: Characterization Of Mipsmentioning

confidence: 99%

“…12 Besides, the incorporation of CDs within the framework structure of adsorbent materials represents a novel modular design approach with significant potential for controlling tuning of the textural mesoporosity of such macromolecular level. 13 Furthermore, CDs were used as potential pore templates to form microporous and nanoporous materials because of their well-defined structure, versatility, and the ability to form inclusion and interfacial complexes. 12,14 Among the CDs types, bcyclodextrin (b-CD) is the most recently used in various synthetic adsorbent materials as it is conveniently accessible and comes in low price.…”

Section: Introductionmentioning

confidence: 99%

“…As promising, the b-CD provides an innovative design strategy for the development of "smart" or "functional" porous adsorbent materials due to their unique physicochemical properties. 13 Therefore, we believed that the morphology property of MIPs, based on modified monomer-b-CD provided useful physicochemical parameters for achieving the optimal polymer design for sorption-based applications.…”

Section: Introductionmentioning

confidence: 99%

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Influence of polymer morphology on the adsorption behaviors of molecularly imprinted polymer‐methacrylic acid functionalized β‐cyclodextrin

Asman

Mohamad

Sarih

2015

J of Applied Polymer Sci

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The influence of molecularly imprinted polymer-methacrylic acid functionalized b-cyclodextrin (MIP(MAA-b-CD)) morphology on the adsorption behavior studies towards benzylparaben (BzP) was explored. The effects of time, concentration, and temperature towards BzP uptake were extensively evaluated. The adsorption performance of MIP(MAA-b-CD) was compared with that on the molecularly imprinted polymer-methacrylic acid (MIP(MAA)) synthesized without b-CD. The MIP(MAA-b-CD) was synthesized to obtain a spherical and spongy-porous texture with a broad pore size distribution. The MIP(MAA-b-CD) showed fast kinetic and the intra-particle diffusion model demonstrated a three step (surface and pore) adsorption process. The Koble-Corrigan isotherm was the most suitable model for data fitting, which indicated that MIP(MAA-b-CD) had homogeneous and heterogeneous surfaces. This finding clearly demonstrated that the large uptake and strong affinity of MIP(MAA-b-CD) did not only probably result from the monomer-template interactions, but also due to the morphological MIP(MAA-b-CD) structure. In contrary to MIP(MAA-b-CD), MIP(MAA) synthesized with uniform morphology and narrow pore size distribution had lower adsorption capacities and its kinetic data fitted the pseudo-second order diffusion model, indicating a two-step (surface only) adsorption process. The MIP(MAA) adsorption process followed the Langmuir isotherm model referred to solely homogeneous uptake. The calculated thermodynamic parameters showed that the BzP uptake was exothermic, spontaneous, and physisorption process onto MIPs, which supported the results of kinetics and isotherm adsorption data. This study clearly revealed that the presence of b-CD improved the morphology of synthesized MIP, and automatically enhanced the adsorption behavior of MIP.

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Preparation and sorption studies of microsphere copolymers containing β‐cyclodextrin and poly(acrylic acid)

Guo¹,

Wilson²

2012

J of Applied Polymer Sci

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Microsphere polymeric materials containing β‐cyclodextrin (β‐CD) and poly(acrylic acid) (PAA) with tunable morphologies were prepared in order to improve their sorption characteristics in aqueous solution. The microsphere polymeric materials were prepared using a (water/oil) micro‐emulsion‐evaporation technique to condense β‐cyclodextrin (β‐CD) with PAA at various comonomer ratios and mixing speeds. The β‐CD microsphere copolymers were characterized using FTIR, TGA, DSC, SEM, elemental (C and H) microanalyses, and solid state 13C‐NMR spectroscopy. The sorption properties of the polymeric materials at 295 K in aqueous solution containing p‐nitrophenol (PNP) were studied using a dye‐based method with UV–Vis spectrophotometry at pH 4.6 and 10.3. The sorption isotherms of copolymer/PNP systems were evaluated with various isotherm models (e.g., Langmuir, BET, Freundlich, and Sips). The Sips isotherm showed the best overall agreement with the experimental results and the sorption parameters provided estimates of the sorbent surface area (12.0–331 m2/g) and the sorption capacity (Qm = 0.359–2.20 mmol/g at pH = 4.6; Qm = 0.070–0.191 mmol/g at pH = 10.3) for the microsphere copolymer/PNP systems in aqueous solution. The nitrogen adsorption properties of the microporous copolymers in the solid state were obtained at 77K with BET surface areas ranging from 0.275 to 4.47 m2/g. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Surface area and pore structure properties of urethane-based copolymers containing β-cyclodextrin

Cited by 74 publications

References 50 publications

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

Influence of polymer morphology on the adsorption behaviors of molecularly imprinted polymer‐methacrylic acid functionalized β‐cyclodextrin

Preparation and sorption studies of microsphere copolymers containing β‐cyclodextrin and poly(acrylic acid)

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