Taking the Plasticizer out of Methacrylic-Acrylic Membranes for K+-Selective Electrodes

Heng, Lee Yook; Hall, Elizabeth A. H.

doi:10.1002/(sici)1521-4109(200002)12:3<187::aid-elan187>3.0.co;2-z

Cited by 36 publications

(18 citation statements)

References 29 publications

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“…An obvious solution to the problem of non-biocompatibility caused by plasticiser is to eliminate the use of plasticiser altogether. This has been attempted with polymer matrix such as sol-gel (8) and also methacrylic-acrylic copolymers (9)(10)(11)(12)(13)(14) . In this work, we have synthesised a methacrylic-acrylic copolymer and employed it as a non-plasticised membrane for hydrogen ion-selective sensor application.…”

Section: Introductionmentioning

confidence: 99%

A Hydrogen Ion-Selective Sensor Based on Non-Plasticised Methacrylic-acrylic Membranes

Heng

Chern

Ahmad

2002

Sensors

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A methacrylic-acrylic polymer was synthesised for use as a non-plasticised membrane for hydrogen ion-selective sensor incorporating tridodecylamine as an ionophore. The copolymer consisted of methyl methacrylate and n-butyl acrylate monomers in a ratio of 2:8. Characterisation of the copolymer using FTNMR demonstrated that the amount of each monomer incorporated during solution polymerisation was found to be similar to the amount used in the feed before polymerisation. The glass transition temperature of the copolymer determined by differential scanning calorimetry was -30.9 ºC. Potentiometric measurements conducted showed a linear pH response range of 4.3 -9.6 with the response slope of 56.7 mV/decade. The selectivity of the sensors towards hydrogen ions was similar to other plasticiser based membrane electrodes and the logarithmic selectivity coefficients for discrimination against interference cations is close to -9.7. However, the incorporation of a lipophilic anion as membrane additive is essential in ensuring optimum performance of the hydrogen ion sensor.

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Section: Introductionmentioning

confidence: 99%

A Hydrogen Ion-Selective Sensor Based on Non-Plasticised Methacrylic-acrylic Membranes

Heng

Chern

Ahmad

2002

Sensors

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“…However as with the plasticized PVC membranes these crown ethers tend to show some leaching which reduced the ISE lifetime; they were also incompatible with the self-plasticized copolymer, forming opaque membranes and electrodes of no potassium selectivity. In contrast, lipophilic crown ethers such as bis- or mono-nitrobenzo-15-crown-5 were found to be compatible with the self-plasticized copolymers yielding ISEs with good potassium ion selectivity, closely resembling plasticized PVC membrane based electrodes even though these new membranes contained two added plasticizer [147]. The same group reported one-step synthesis of K + -selective methacrylic-acrylic copolymers (Figure 33) containing grafted ionophore and requiring no plasticizer in the same year [148].…”

Section: Application Of the Concept Of Supramolecular Chemistry In Thmentioning

confidence: 99%

Supramolecular Based Membrane Sensors

Ganjali

Norouzi

Rezapour³

et al. 2006

Sensors

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“…The assays of crown ethers, both AAB15C5 and AAB18C6 were performed with a procedure similar to that reported by Kaneko et al [18] and was described in detail in our previous paper [19]. The copolymer samples were ®rst dissolved in a known volume of chloroform.…”

Section: Assay Of Crown-ether Content In Copolymersmentioning

confidence: 99%

“…The detailed procedure can be found in our previous paper [19]. The R f 's of the ionophores AAB15C5 and AAB18C6 were determined by reverse phase thin layer chromatography (RPTLC) on TLC plates (RP-8F 254 S, Merck) and iodine vapour was employed for spot visualization.…”

Section: Determination Of Relative Lipophilicity Of Ionophoresmentioning

confidence: 99%

“…Various amounts of potassium tetrakis(4-chlorophenyl)]borate (KTClPB) were included in the membranes (Table 4). For comparison purposes, membranes from blank copolymer MB1:10 and plasticized MB32 [7,19] with AAB15C5 or AAB18C6 and KTClPB were also prepared ( Table 4). The plasticizer used for MB32 based membranes was O-nitrophenyl octyl ether (NPOE).…”

Section: Preparation Of Polymer Membranes For Potentiometric Studiesmentioning

confidence: 99%

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One-Step Synthesis of K+-Selective Methacrylic-Acrylic Copolymers Containing Grafted Ionophore and Requiring No Plasticizer

Heng

Hall

2000

Electroanalysis

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A main drawback in the application of ion sensors that are based on plasticized polymeric membranes is the problem of leaching of plasticizer and ionophore. Leaching problems can be critical in solid-state minidevices, e.g., ion-selective electrodes or optodes, where a thin ion sensing polymer ®lm is often empolyed. To resolve such problems, we have designed simple methacrylic-acrylic copolymers that required no plasticizer and which include immobilized polymerizable but hydrophilic ionophores such as 4-acryloylamidobenzo-15-crown-5 (AAB15C5) and 4-acryloylamidobenzo-18-crown-6 (AAB18C6) that would normally be susceptible to leaching from plasticized PVC membranes, were used as model ionophores for the immobilization studies. These crown compounds are attractive since they can be employed as a monomeric unit in the copolymer recipe and thus no additional synthesis or polymer modi®cation is required. Copolymers suitable for ion-selective membrane application were synthesized by introducing more than 80 wt. % of n-butyl acrylate to yield copolymers of T g 's between 7 20 to 7 30 C. The molecular weight distributions of these copolymers were M w`5 0 000 Da and they contained 2 to 6 wt. % of immobilized crown ether ionophores. The`self-plasticising' methacrylic-acrylic membranes formed with these acryloyl crown ethers demonstrated good potentiometric responses to potassium ion. In contrast, AAB15C5 and AAB18C6 entrapped in membranes in a more classical ion selective membrane recipe, even when a plasticizer was included, were still inferior in their response to those with membranes containing immobilized ionophores. The restricted mobility of the immobilized ionophores in these self-plasticizing polymer matrices did not appear to hinder the normal complexation behavior of these ionophores. This was inferred from the possible formation of the usual 2:1 and 1:1 ionophore-cation complexes of AAB15C5 and AAB18C6, respectively, in these new copolymer matrices.

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Taking the Plasticizer out of Methacrylic-Acrylic Membranes for K+-Selective Electrodes

Cited by 36 publications

References 29 publications

A Hydrogen Ion-Selective Sensor Based on Non-Plasticised Methacrylic-acrylic Membranes

A Hydrogen Ion-Selective Sensor Based on Non-Plasticised Methacrylic-acrylic Membranes

Supramolecular Based Membrane Sensors

One-Step Synthesis of K+-Selective Methacrylic-Acrylic Copolymers Containing Grafted Ionophore and Requiring No Plasticizer

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