Miscibility of mixed stereoregular PMMA/PVCN monolayers at the air/water interface

Hsu, Wen-Ping; Chiou, Ming-Shen; Li, Hsing-Ya

doi:10.1002/app.34940

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…In the ideal case, the plot of A E versus X 2 should be a straight line. Any deviation from it ( A E = A 12 – A id ≠ 0) indicates partial miscibility and nonideality. , If attractive intermolecular forces are dominant, A E will be negative. On the other hand, positive value ( A E > 0) indicates a repulsive interaction between the constituent components of the mixed monolayer.…”

Section: Resultsmentioning

confidence: 99%

Reversible Transition between Excimer and J-Aggregate of Indocarbocyanine Dye in Langmuir–Blodgett (LB) Films

Debnath¹,

Chakraborty²,

Deb

et al. 2015

J. Phys. Chem. C

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In the present Article, a reversible transition behavior from Jaggregates to excimer of an indocarbocyanine dye 1,1′-dioctadecyl-3,3,3′,3′tetramethylindocarbocyanine perchlorate (DiI) in Langmuir−Blodgett (LB) films was reported. Surface pressure−area (π−A) isotherms, UV−vis, and fluorescence spectroscopies as well as atomic force microscopy (AFM) were used for characterizations of the films. π−A isotherms suggest a balance of interactions between DiI and fatty acids in the mixed monolayer at DiI mole fraction X DiI = 0.4, resulting in a stable and ideally mixed monolayer. It has been observed that pure DiI formed excimer in LB films, whereas both J aggregates and excimer were formed in LB films when DiI was mixed with long chain fatty acids, viz., stearic acid or arachidic acid. In fatty acid matrix at X DiI = 0.4, only J aggregates were formed in the LB films. This has been confirmed using deconvolution of spectroscopic results as well as using excitation spectroscopy. The coherent size of the J aggregate was found to be a maximum for the mixed film at the mole fraction 0.4 of DiI in fatty acid matrix. The J-aggregate domain in the LB film contains approximately (20 ± 5) coherent sizes. However, J aggregates were totally absent when DiI was mixed with cationic surfactant, polymer, or nanoclay.

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Section: Resultsmentioning

confidence: 99%

Reversible Transition between Excimer and J-Aggregate of Indocarbocyanine Dye in Langmuir–Blodgett (LB) Films

Debnath¹,

Chakraborty²,

Deb

et al. 2015

J. Phys. Chem. C

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“…To understand the mechanism and kinetics of drug release, the results obtained were studied for two periods of release separately. The first one was from (time 0-5) h and denoted by PI, while the second period, PII, was used for the second release (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) h. The data were fit into different kinetic equations such as: zero order model (Eq. 1) Fig.…”

Section: Flurbiprofen Loading and Releasementioning

confidence: 99%

“…Amphiphilic block or graft copolymers containing hydrophilic and hydrophobic segments have the ability of micelle formation by self-assembly in selective solvents [18]. Many blends and composites of polyVCi had been reported in the literature [19][20][21]. Poly(2-hydroxy ethyl methacrylate) (polyHEMA), on the other hand, has been proven to be a useful polymer for applications in the biomedical field since it was first synthesized in 1960.…”

Section: Introductionmentioning

confidence: 99%

A polymer hybrid film based on poly(vinyl cinnamate) and poly(2-hydroxy ethyl methacrylate) for controlled flurbiprofen release

Alokour

Yilmaz

2021

J Polym Res

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A crosslinked polymer hybrid film, ipn-poly(vinyl cinnamate-graft-2-hydroxy ethyl methacrylate)-v-poly(ethylene glycol dimethacrylate) was synthesized by UV initiation using poly(vinyl cinnamate) (polyVCi), 2-hydroxy ethyl methacrylate (HEMA) monomer and ethylene glycol dimethacrylate (EGDMA) crosslinker. Benzophenone (Ph 2 CO), was used as the photoinitiator. The synthesis was optimized by changing the concentration of HEMA, Ph 2 CO, EGDMA, and UV irradiation time. PolyVCi undergoes photocrosslinking by 2 + 2 photocylo addition while the monomer/crosslinker couple, HEMA/ EGDMA, undergoes free radical polymerization and crosslinking to form EGDMA crosslinked polyHEMA. Hence, simultaneous interpenetrating polymer network (IPN) formation occurs. The IPN consists of dual network of photocrosslinked polyVCi and EGDMA crosslinked polyHEMA chains. Grafting of HEMA/EGDMA chains on the polyVCi backbone also occur during network formation. The chemical functionalities present in the polyVCi/polyHEMA/polyEGDMA IPN films obtained were characterized by FTIR and SEM analysis. The contact angle measurements show enhanced wettability of the IPN film compared to polyVCi surface. TGA analysis confirms thermal stability of the films. Swelling behavior of the films examined in water and in ethanol reveals the effects of the chemical natures of polyVCi and polyHEMA as well as that of crosslinking on the hydrophilicity of the film. The films were tested as drug release matrices using flurbiprofen. The drug was loaded into the film matrix during IPN formation under UV irradiation. PolyVCi/polyHEMA/polyEGDMA IPN proved to be a suitable release matrix for flurbiprofen demonstrating controlled release behavior and zero-order release kinetics. The release mechanism was confirmed by its Ritger-Peppas "n" value (1.00 to 1.42), which indicates super case II release.

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“…An alternative to copolymers is binary blends of polymers allowing a wide range of thin-film properties and thus potential applications. The 2D confinement and the properties of the air–water interface can lead to a different arrangement of polymer chains or unexpected mixing behavior with respect to three-dimensional (3D) materials. − …”

Section: Introductionmentioning

confidence: 99%

Vertically Heterogeneous 2D Semi-Interpenetrating Networks Based on Cellulose Acetate and Cross-Linked Polybutadiene

et al. 2022

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This work reports the feasibility of polybutadiene (PB) cross-linking under UV irradiation in the presence of a linear polymer, cellulose acetate (CA), to form semi-interpenetrating polymer networks at the air–water interface. The thermodynamic properties and the morphology of two-dimensional (2D) CA/PB blends are investigated after UV irradiation and for a wide range of CA volume fractions. A contraction of the mixed Langmuir films is observed independent of the composition, in agreement with that recorded for the individual PB monolayer after cross-linking. The PB network formation is demonstrated by in situ sum-frequency generation spectroscopy on the equivolumic CA/PB mixed film. From Brewster angle microscopy observations, the PB network synthesis does not induce any morphology change at the mesoscopic scale, and all of the mixed films remain homogeneous laterally. In situ neutron reflectometry is used to probe the effect of PB cross-linking on the vertical structure of CA/PB mixed films. For all studied compositions, significant thickening of the films is evidenced, consistent with their contraction ratio. This thickening is accompanied by a partial expulsion of the PB toward the film–air interface, which is attributed to the hydrophobic character of the PB. This phenomenon is stronger for films rich in PB. In particular, the structure of the PB-rich film undergoes a transition from vertically homogeneous to inhomogeneous along the depth. 2D semi-interpenetrating polymer networks can thus be synthesized at the air–water interface with a morphology that is strongly influenced by the polymer–polymer and polymer–environment interactions.

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Miscibility of mixed stereoregular PMMA/PVCN monolayers at the air/water interface

Cited by 6 publications

References 23 publications

Reversible Transition between Excimer and J-Aggregate of Indocarbocyanine Dye in Langmuir–Blodgett (LB) Films

Reversible Transition between Excimer and J-Aggregate of Indocarbocyanine Dye in Langmuir–Blodgett (LB) Films

A polymer hybrid film based on poly(vinyl cinnamate) and poly(2-hydroxy ethyl methacrylate) for controlled flurbiprofen release

Vertically Heterogeneous 2D Semi-Interpenetrating Networks Based on Cellulose Acetate and Cross-Linked Polybutadiene

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