Optical and Thermal Properties of Poly‐<i>bis</i>‐ phenol‐A Carbonate: Photoacoustic Study

Singh, Hukum; Joshi, S. K.; Rathore, Sanjeev; Joshi, Tanuja; Zaidi, M. G. H.; Rai, A. K.

doi:10.1081/ci-120025572

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…Wood shows a weak absorption at 260 nm, whereas pure PMMA shows a broad absorption band between 260-295 nm which is due to the n-p transition of the carbonyl linkage of the ester group. [11] The WPC synthesized at an MMA concentration of 3.0 M also shows a broad absorption band between 265-295 nm. This observation indicates the presence of impregnated PMMA into wood.…”

Section: Optical Spectramentioning

confidence: 98%

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Optical, Morphological, Thermal, Mechanical, and Fungal Characterization of Wood Polymethyl Methacrylate Composites

Kumar

Zaidi

Rathore³

et al. 2006

Instrumentation Science & Technology

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Impregnation polymerization of methyl methacrylate (MMA) into blackberry wood, at a series of methyl methacrylate concentrations ranging 1.0 -3.0 M, in presence of benzoyl peroxide (0.02 M) in methanol, at 75 + 18C, afforded wood polymethyl methacrylate composites (WPCs). Photoacoustic (PA) spectra of pure polymethyl methacrylate (PMMA), wood, and WPCs have been recorded in the wavelength region 250-400 nm using a single beam PA spectrometer; PA spectra of pure PMMA show absorption at 270 nm, due to n-p transition of carbonyl linkage of the ester group. UV-VIS spectra in chloroform for PMMA and WPC indicate maximum absorptions at 275 and 280 nm, respectively, whereas wood does not indicate any sharp absorption. PA spectra of wood and WPC show a strong band at 270 nm, which may be due to the presence of lignin. The presence of PMMA loading into wood was qualitatively ascertained through scanning electron microscopy and qualitatively through PA spectroscopy. Wood indicates a maximum load failure in terms of compression strength, charpy, and izod impacts at 3.99 Â 10 7 N/m 2 , 23.91, and 7.35 Nm, respectively. Impregnation of PMMA enhanced the strength of wood under compression and impact with MMA concentrations. Thermogravimetric analysis (TG), differential scanning calorimetery (DSC), and differential thermogravimetry (DTG) data in air indicate that thermo oxidative stability of wood due to PMMA impregnation was significantly improved. PMMA impregnation into wood imparts improved resistance to water, alcohol-benzene media, sodium hydroxide (10%), ether, and towards a white rot fungus Coriolous versicolor.

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Section: Optical Spectramentioning

confidence: 98%

“…[11] In the present work, PAS has been introduced to investigate the qualitative and quantitative nature of PMMA impregnation into wood. Impregnation of PMMA into wood was also confirmed through UV-VIS spectra, scanning electron micrographs, and the PAS technique.…”

Section: Introductionmentioning

confidence: 99%

Optical, Morphological, Thermal, Mechanical, and Fungal Characterization of Wood Polymethyl Methacrylate Composites

Kumar

Zaidi

Rathore³

et al. 2006

Instrumentation Science & Technology

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“…It is known that different photoacoustic configurations have diverse applications in several areas of the knowledge and with the possibility of being used for the obtaining of spectra not only as a function of wavelength, but as well as a function of light modulation frequency. It is worth mentioning that not only amplitude spectra but also phase ones and signals depending on the frequency can be obtained, which would lead to the application of other methods and mathematical analysis to obtain nonradiative relaxation times and sample depth analysis [95][96][97][98][99][100], among other optical and thermal parameters.…”

Section: Pas Applications In Food and Agrofood Industrymentioning

confidence: 99%

Photoacoustic Spectroscopy in the Optical Characterization of Foodstuff: A Review

Hernández-Aguilar

Domínguez-Pacheco

Cruz‐Orea

et al. 2019

Journal of Spectroscopy

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In this review, the application of the photoacustic spectroscopy (PAS) is presented as an option to evaluate the quality of food. This technique is a type of spectroscopy based on photothermal phenomena, which allow spectroscopic studies. According to the literature review, it was found that its application is increasing in several countries. Spectroscopic studies carried out by employing PAS in the food industry include, among others, fruit, vegetables, condiments, grains, legumes, flours, “tortillas,” milk, water, eggs, etc. Additionally, this technique has been used to evaluate adulterated, irradiated, and contaminated food and so on. The literature review has shown the applicability of PAS to one of the problems of the real world, i.e., food quality assessment. Therefore, PAS can contribute in the future with a wide potential for new applications in the food agroindustry.

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Photoacoustic spectroscopy: a novel optical characterization technique in agricultural science

Nilesh¹,

Singh²,

Awadhesh³

2023

Photoacoustic and Photothermal Spectroscopy

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Optical and Thermal Properties of Poly‐bis‐ phenol‐A Carbonate: Photoacoustic Study

Cited by 3 publications

References 19 publications

Optical, Morphological, Thermal, Mechanical, and Fungal Characterization of Wood Polymethyl Methacrylate Composites

Optical, Morphological, Thermal, Mechanical, and Fungal Characterization of Wood Polymethyl Methacrylate Composites

Photoacoustic Spectroscopy in the Optical Characterization of Foodstuff: A Review

Photoacoustic spectroscopy: a novel optical characterization technique in agricultural science

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