Step-Scan FT-IR Photoacoustic Studies of a Double-Layered Polymer Film on Metal Substrates

Wahls, M. W. C.; Leyte, J. C.

doi:10.1366/0003702981942447

Cited by 10 publications

(3 citation statements)

References 16 publications

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“…[9][10][11][12][13][14][15][16][17] One polar monomer (methyl methacrylate) and one nonpolar monomer (styrene) are selected as comonomers for producing poly(n-butyl acrylate) copolymer/silicate nanocomposites, because they have different polarities. In this paper, the chemical affinities of BA, MMA, ST, mixtures of BA/ MMA, and BA/ST with silicate layers will be examined in association with the basal spacings of silicate in monomer/ silicate dispersion states and with the e-values of monomers.…”

Section: Introductionmentioning

confidence: 99%

Poly(n-butyl acrylate-co-methyl methacrylate) and poly(n-butyl acrylate-co-styrene)/ silicate nanocomposites prepared by emulsion polymerization

Choi

Chung

2003

Macromol. Res.

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Two types of poly(n-butyl acrylate) copolymer/silicate nanocomposites have been produced: poly(n-butyl acrylate-co-methyl methacrylate) [P(BA-co-MMA)]/silicate nanocomposites and poly(n-butyl acrylate-co-styrene) [P(BA-co-ST)]/silicate nanocomposites. The P(BA-co-MMA)/silicate nanocomposites shows the exfoliated structures but a P(BA-co-ST)/silicate nanocomposites have intercalated structures, because the BA/MMA comonomer has a higher polarity (e-value in Q-e scheme) than the BA/ST comonomer. The BA/MMA comonomer expanded the interlayer space of the silicate wider than did the BA/ST comonomer. The thermal degradation onset point of the P(BA-co-MMA)/silicate nanocomposites was 43 o C higher than that of pure P(BA-co-MMA). P(BA-co-MMA)T5%, P(BA-co-MMA)T10%, and P(BA-co-MMA)T20% exhibit 134, 302, and 195% increases, respectively, in their storage moduli at -20 o C relative to the pure copolymer.

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Section: Introductionmentioning

confidence: 99%

Poly(n-butyl acrylate-co-methyl methacrylate) and poly(n-butyl acrylate-co-styrene)/ silicate nanocomposites prepared by emulsion polymerization

Choi

Chung

2003

Macromol. Res.

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“…Some of them contain general content of the use and application of FT-IR/PAS [22][23][24][25][26][27][28][29][30][31], others are more specific and are devoted to real-time PA parallel detection of products from catalyst libraries [32], step-scan and depth profiling analysis [33][34][35][36][37][38][39][40], the effect of particle size on FT-IR/PAS spectra [41][42][43][44], the temperature effect on PA signal [45], sample emission effects [46], and synchrotron IR/PAS [47]. During a PA measurement the sample is enclosed in a small, tightly closed sample compartment called PA cell [48][49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Application of infrared photoacoustic spectroscopy in catalysis

Ryczkowski

2007

Catalysis Today

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“…This work extends a paper by Dubois et al 18 from 1994, where experimental PA intensities are used to determ ine the optical absorption coef® cient. We also presented a PA study of a m odel polym er-coating system, 19 i.e., a double-layered polym er ® lm, which was attached to various m etal substrates. A n in¯uence of the therm al characteristics of the backing on the photoacoustic signal of the coating is found, and can be used to discriminate between different metals.…”

Section: Introductionmentioning

confidence: 99%

Depth Profiles in Coated Paper: Experimental and Simulated FT-IR Photoacoustic Difference Magnitude Spectra

2000

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Experimental photoacoustic (PA) magnitude spectra of a coated paper and the uncoated basepaper are presented. The normalized and scaled PA magnitude spectra are used to calculate difference magnitude spectra. It was decided to scale all PA magnitude spectra to (low) equal intensity at the approximately optically thin spectral range before subtraction. Then no infrared (IR) bands of identical band shape and height (as needed for common difference spectroscopy) in either PA magnitude spectrum are needed. Contributions of the two individual layers to the IR-PA magnitude spectrum of the coated paper are separated in the difference spectrum by their sign. An increasing relative contribution of the coating layer with an increasing phase modulation frequency is found. On decreasing the thermal length to a value near the coating thickness, the difference spectra increasingly show positive coating bands and negative bulk signals. The extension of the Rosencwaig–Gersho theory to a double-layered system introduced by N. C. Fernelius [J. Opt. Soc. Am. 70, 480 (1980) and J. Appl. Phys. 50, 650 (1980)] applied to synthetic spectra confirms the experimental observation. It is found that photoacoustic difference spectroscopy may provide quantitative depth-resolved spectral information due to the presented scaling procedure, and photoacoustic difference magnitude spectra of any polymeric laminate may therefore be calculated.

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Step-Scan FT-IR Photoacoustic Studies of a Double-Layered Polymer Film on Metal Substrates

Cited by 10 publications

References 16 publications

Poly(n-butyl acrylate-co-methyl methacrylate) and poly(n-butyl acrylate-co-styrene)/ silicate nanocomposites prepared by emulsion polymerization

Poly(n-butyl acrylate-co-methyl methacrylate) and poly(n-butyl acrylate-co-styrene)/ silicate nanocomposites prepared by emulsion polymerization

Application of infrared photoacoustic spectroscopy in catalysis

Depth Profiles in Coated Paper: Experimental and Simulated FT-IR Photoacoustic Difference Magnitude Spectra

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