Fourier Transform Infrared Imaging of Stereoregular Poly(Methyl Methacrylate) Dissolution

Bobiak, John P.; Koenig, Jack L.

doi:10.1366/0003702042336091

Cited by 11 publications

(5 citation statements)

References 50 publications

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“…A recent study by Roth and Dutcher7 has reported that a 17 K reduction in T g relative to T g,bulk was observed in 30‐nm‐thick freely standing PMMA films. We believe that the acid group of acetic acid prevents or severely reduces the interaction between PMMA and the hydroxyl groups on the surface of silica; this is because the acid group interacts strongly with the PMMA ester side group 49. (The sharply contrasting T g results obtained in the PMMA–silica nanocomposites made using methyl ethyl ketone and acetic acid cannot be explained by a segregation of dye to the nanofiller interface in a nanocomposite made in one solvent but not when made in the other solvent.…”

Section: Resultsmentioning

confidence: 99%

Polymer–nanoparticle interfacial interactions in polymer nanocomposites: Confinement effects on glass transition temperature and suppression of physical aging

Rittigstein,

Torkelson

2006

J Polym Sci B Polym Phys

401

368

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The effects of confinement on glass transition temperature (T g ) and physical aging are measured in polystyrene (PS), poly(methyl methacrylate) (PMMA), and poly(2-vinyl pyridine) (P2VP) nanocomposites containing 10-to 15-nm-diameter silica nanospheres or 47-nm-diameter alumina nanospheres. Nanocomposites are made by spin coating films from sonicated solutions of polymer, nanofiller, and dye. The T g s and physical aging rates are measured by fluorescence of trace levels of dye in the films. At 0.1-10 vol % nanofiller, T g values can be enhanced or depressed relative to neat, bulk T g (T g,bulk ) or invariant with nanofiller content. For alumina nanocomposites, T g increases relative to T g,bulk by as much as 16 K in P2VP, decreases by as much as 5 K in PMMA, and is invariant in PS. By analogy with thin polymer films, these results are explained by wetted P2VP-nanofiller interfaces with attractive interactions, nonwetted PMMA-nanofiller interfaces (free space at the interface), and wetted PS-nanofiller interfaces lacking attractive interactions, respectively. The presence of wetted or nonwetted interfaces is controlled by choice of solvent. For example, 0.1-0.6 vol % silica/PMMA nanocomposites exhibit T g enhancements as large as 5 K or T g reductions as large as 17 K relative to T g,bulk when films are made from methyl ethyl ketone or acetic acid solutions, respectively. A factor of 17 reduction of physical aging rate relative to that of neat, bulk P2VP is demonstrated in a 4 vol % alumina/ P2VP nanocomposite. This suggests that a strategy for achieving nonequilibrium, glassy polymeric systems that are stable or nearly stable to physical aging is to incorporate well-dispersed nanoparticles possessing attractive interfacial interactions with the polymer.

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Section: Resultsmentioning

confidence: 99%

Polymer–nanoparticle interfacial interactions in polymer nanocomposites: Confinement effects on glass transition temperature and suppression of physical aging

Rittigstein,

Torkelson

2006

J Polym Sci B Polym Phys

401

368

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“…Despite identical chemistry and molecular weight, polymeric stereoisomers may display considerably different behaviors upon exposure to a solvent. Three stereoisomers of PMMA of similar molecular weight have been exposed to a variety of solvents in an FT‐IR imaging set‐up 35…”

Section: Ir and Raman Imaging Backgroundmentioning

confidence: 99%

Raman and Infrared Imaging of Dynamic Polymer Systems

Koenig

Bobiak

2007

Macro Materials & Eng

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This work reviews principles of Raman and infrared imaging, as well as applications of the art to understand physiochemical phenomena in polymer systems. Image sequences may be assessed in terms of spatial or spectral changes that occur over time, either within a specific region or across the field of view. As such, the methods have enabled the analysis of diffusion and dissolution processes at polymer interfaces, drug release from polymer matrices, and structural transitions among others. Despite analytical limitations imposed by resolution (spectral or spatial) and sample preparation, Raman and infrared imaging are powerful tools for relating performance attributes to molecular‐level characteristics.magnified image

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“…This technique is especially suitable to investigate the miscibility of polymer blends. 21–26 In the field of polymers, FT-IR was also applied to study the dissolution, 27,28 crystallization, 29,30 and thermal and photooxidation 31,32 properties and the preparation of hydrogels 33,34 and the microstructures of a metal-supported poly(methyl methacrylate). 35…”

Section: Introductionmentioning

confidence: 99%

Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FT-IR) Mapping Coupled with Multivariate Curve Resolution (MCR) for Studying the Miscibility of Chlorobutyl Rubber/Polyamide-12 Blends

2015

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A series of chlorobutyl rubber/polyamide-12 (CIIR/PA-12) blends compatibilized by different amounts of maleic anhydride (MAH) grafted polypropylene (PP-g-MAH) were investigated by attenuated total reflection Fourier transform infrared spectroscopy (ATR FT-IR) mapping. Multivariate curve resolution (MCR) was used to process the FT-IR images. Both the spectra of pure components in the blends and their concentration distributions in a micro-region were acquired. Our results demonstrated that the blend with 15 parts per hundred rubber PP-g-MAH showed the best miscibility. An amide interphase and an imide interphase were inferred by analyzing the spectra of MCR component 3 of the blends with and without PP-g-MAH, respectively. Correspondingly, two different compatibilizing mechanisms were proposed for these blends.

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Fourier Transform Infrared Imaging of Stereoregular Poly(Methyl Methacrylate) Dissolution

Cited by 11 publications

References 50 publications

Polymer–nanoparticle interfacial interactions in polymer nanocomposites: Confinement effects on glass transition temperature and suppression of physical aging

Polymer–nanoparticle interfacial interactions in polymer nanocomposites: Confinement effects on glass transition temperature and suppression of physical aging

Raman and Infrared Imaging of Dynamic Polymer Systems

Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FT-IR) Mapping Coupled with Multivariate Curve Resolution (MCR) for Studying the Miscibility of Chlorobutyl Rubber/Polyamide-12 Blends

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