Fast transient fluorescence technique (FTRT) for studying dissolution of polymer glasses

Pekcan, Önder; Uǧur, Şaziye

doi:10.1002/(sici)1097-4628(19991024)74:4<948::aid-app21>3.0.co;2-d

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…However, this technique does not allow determination of the concentration profiles. Pekan et al − have studied the dissolution process of fluorescence labeled PMMA samples by monitoring the fluorescence of the dissolved residues during its incorporation to the solution. But, in this case, it is not possible to obtain concentration profiles, and one cannot study the interactions of the polymer with the solvent as it dissolves.…”

Section: Introductionmentioning

confidence: 99%

FTIR Imaging of the Dissolution of Polymers. 4. Poly(methyl methacrylate) Using a Cosolvent Mixture (Carbon Tetrachloride/Methanol)

González‐Benito

Koenig

2002

Macromolecules

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The dissolution process of poly(methyl methacrylate) in mixtures of methanol and carbon tetrachloride, individually nonsolvents for the polymer (under the conditions of study), was studied at 25 °C using FTIR imaging spectroscopy. To investigate this cosolvency phenomenon, the spatial resolution and sensitivity of FTIR imaging to interactions between the components were used. The results obtained suggest that the dissolution process of the PMMA in a high weight fraction of the CCl4/CH3OD solvent mixtures consists of first the swelling of the PMMA by the CCl4 allowing the methanol to penetrate into the PMMA and specifically interact (hydroxyl−carbonyl hydrogen bonds) with the polymer to separate the polymer chains. Furthermore, the effect of compositions of the solvent mixtures on the dissolution rates is a result of two opposite effects: (i) the ability of the polymer to be swelled (CCl4 fraction) and (ii) the number of specific interactions between the polymer and one of the nonsolvents (methanol fraction).

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Section: Introductionmentioning

confidence: 99%

FTIR Imaging of the Dissolution of Polymers. 4. Poly(methyl methacrylate) Using a Cosolvent Mixture (Carbon Tetrachloride/Methanol)

González‐Benito

Koenig

2002

Macromolecules

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“…Recently fast transient fluorescence (FTRF) method was used to monitor dissolution of polymer glasses [23,24]. The effect of γ -irradiation on latex film dissolution was extensively studied using the SSF method where two different regimes of dissolution coefficients were attributed to two different molecular weight distributions caused by scission and branching of polymer chains when they were irradiated by γ -rays [25].…”

Section: Introductionmentioning

confidence: 99%

Dissolution of Al2O3-polystyrene latex composites: a fluorescence study

Uǧur¹,

Tepehan²,

Pekcan³

2005

Composite Interfaces

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This work reports the use of the steady state fluorescence (SSF) technique to study dissolution of a composite film formed from a mixture of Al 2 O 3 and polystyrene (PS) latex particles. The composite films were cast from dispersion of pyrene (P)-labeled PS particles in Al 2 O 3 solution at room temperature and annealed at 280 • C temperature for 10 min. Eight different composite films were studied in various latex contents. Toluene was used as dissolution agent. Fluorescence intensities I P from P were monitored during dissolution. Fickian diffusion was employed to model the dissolution processes. Dissolution coefficients, D d , were measured and found to be increased at high PS content in the composite films.

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“…Film formation from donor- and acceptor-labeled latex particles has been studied using DET in conjunction with TRF technique. − A single-photon counting method in conjunction with DET was used to study the diffusion of small dye molecules within the interphase domain of dye-labeled poly(methyl methacrylate) (PMMA) particles sterically stabilized by polyisobutylene, where mean lifetimes of fluorescing donor molecules were measured to monitor diffusion , and the Fickian model for diffusion was employed to determine diffusion coefficients. Recently, fast transient fluorescence (FTRF) technique was used in our laboratory to study polymer dissolution, , gel swelling, , and gelation processes in solvent. In these studies, Strobe Master System (SMS) was used and a model was employed for low-quenching efficiencies to measure lifetimes of pyrene ( P ) which was used as a fluorescence probe.…”

Section: Introductionmentioning

confidence: 99%

Gel Swelling Induced by Organic Vapors; Fast Transient Fluorescence Study

Pekcan

Erdoğan

2002

J. Phys. Chem. B

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Fast transient fluorescence technique (FTRF) which uses Strobe Master System (SMS) was used to study swelling of disk-shaped poly(methyl methacrylate) (PMMA) gels. Disk-shaped PMMA gels were prepared by free-radical copolymerization of methyl (methacrylate) (MMA) and ethylene glycol dimethacrylate (EGDM). Pyrene (P) was introduced as a fluorescence probe during polymerization, and lifetimes of P were measured during in-situ swelling process. Various organic solvents were used for vapor-induced gel swelling. An equation is derived for low-quenching efficiencies to interpret the behavior of lifetimes, τ during swelling. It was observed that τ values decreased as swelling proceeded. Li-Tanaka equation was used to determine the cooperative diffusion coefficients, D c , which were around 10 -5 cm 2 s -1 .

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Fast transient fluorescence technique (FTRT) for studying dissolution of polymer glasses

Cited by 10 publications

References 29 publications

FTIR Imaging of the Dissolution of Polymers. 4. Poly(methyl methacrylate) Using a Cosolvent Mixture (Carbon Tetrachloride/Methanol)

FTIR Imaging of the Dissolution of Polymers. 4. Poly(methyl methacrylate) Using a Cosolvent Mixture (Carbon Tetrachloride/Methanol)

Dissolution of Al2O3-polystyrene latex composites: a fluorescence study

Gel Swelling Induced by Organic Vapors; Fast Transient Fluorescence Study

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