IR and Raman Investigation of Some Poly(acrylic) Acid Gels in Aqueous and Neutralized State

Todicǎ, M.; Ştefan, R.; Pop, C. V.; Olar, Loredana

doi:10.12693/aphyspola.128.128

Cited by 81 publications

(55 citation statements)

References 20 publications

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“…Based on the position of Raman lines, it is concluded that the amount of adsorbed water is low (typically below 10 wt %). Furthermore, the local dynamics of PAA nanofiber/microfiber affecting the molecular polarizability was investigated in this work and is confirmed by previous studies . It is worthwhile to mention here that water has its own Raman lines.…”

Section: Resultssupporting

confidence: 85%

“…Technically, this makes almost impossible to use the Raman spectrometer to measure a water droplet, as the reflected laser beam is very weak and hence, the noise masks the absorption lines (however, the spectrum is nicely recorded in the transmission configuration). Consequently, the analysis was focused on the shift of some Raman lines due to the water retention within the nanofibers, which is in agreement with results reported in the literature . This approach is not very sensitive to the presence of water and hence, relatively small amounts of water adsorbed by the polymer will not be reflected in the Raman spectrum but will be observed during TGA experiments.…”

Section: Resultssupporting

confidence: 76%

“…The line noticed at 1669 cm −1 corresponds to the vibration of C=O unit. The absence of any line around 1700 cm −1 is an additional confirmation of the absence of water in the nanofibers . Figure shows the Raman spectrum of the PAA fibers from 2600 to 3700 cm −1 .…”

Section: Resultsmentioning

confidence: 78%

“…The line located at 508 cm −1 corresponds to bending motions of cis C‐C=O groups. As this line is not shifted toward lower Raman shifts, it is possible to conclude that the amount of water within these nanofibers is very low . Generally, the presence of water in PAA shifts some Raman lines, providing an efficient tool for the quantification of water content .…”

Section: Resultsmentioning

confidence: 90%

“…As this line is not shifted toward lower Raman shifts, it is possible to conclude that the amount of water within these nanofibers is very low. 33 Generally, the presence of water in PAA shifts some Raman lines, providing an efficient tool for the quantification of water content. 33,34 The large band observed between 613 and 645 cm −1 corresponds to the bending vibrations of trans C=O units.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and characterization of centrifugally spun poly(acrylic acid) nanofibers

Garza

Santiago

Materon

et al. 2019

J of Applied Polymer Sci

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The production of poly(acrylic acid) (PAA) nanofibers by the centrifugal spinning of PAA solutions in water is reported. The effect of the spinneret rotational speed and concentration of PAA solutions on the diameter of nanofibers and on their quality (assessed by the absence of beads) is discussed. The main physical properties of PAA such as glass‐transition temperature (Tg) are studied in detail and compared to the feature of the as‐received homopolymer. It is shown that the glass‐transition temperature of the bulk PAA and PAA nanofibers (as measured by differential scanning calorimetry) depends on the heating rate according to a Williams–Landel–Ferry‐like equation. Raman spectroscopy data provided additional information about the differences between the as‐received polymer and the nanofibers. Preliminary results on antibacterial properties of the PAA nanofibers are reported. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47480.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

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Fabrication and characterization of centrifugally spun poly(acrylic acid) nanofibers

Garza

Santiago

Materon

et al. 2019

J of Applied Polymer Sci

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Underwater Structurally‐Colored Adhesives for Visualized Adhesion Monitoring in Aqueous Media

Yu,

Lyu,

Zhang

et al. 2024

Adv Funct Materials

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Assessment of the local strain/stress changes of adhesives is highly desirable for their service to avoid premature failure. However, monitoring local strain/stress variations in adhesives in practical settings remains challenging, especially in aqueous media. Here, an underwater structurally‐colored adhesive for visualized local strain/stress monitoring in aqueous media is reported. The structurally‐colored adhesive is obtained by shearing composites of poly(butyl acrylate‐co‐acrylic acid) copolymer and carboxylated polystyrene colloidal particles. The resultant structurally‐colored adhesive exhibits underwater adhesive strength (i.e., 238 kPa for stainless steel substrates) to various substrates (e.g., metals and plastics) thanks to hydrophobic segments and carboxyl groups. Notably, they can shift color in response to external force, enabling real‐time visual monitoring of localized strain/stress changes. As a proof of concept, the structurally‐colored adhesive can be used to seal a leaking hole on a bottle or tube, and it can precisely visualize the localized pressure distribution, providing critical information on the adhesion performance and the local pressure. These distinctive properties make the structurally‐colored adhesive suitable for application in wet environments as a real‐time visual pressure tracking device.

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pH‐Tunable 3D Interconnected Network of Multiwalled Carbon Nanotubes /Polyacrylic Acid Hydrogel with Excellent Electromagnetic Radiation Shielding Capability

Thi,

Ryu,

Hong

et al. 2024

Adv Materials Technologies

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The fabrication of durable and high anticorrosion hydrogel composite materials composed of multi‐walled carbon nanotubes (MCNTs) and crosslinked polyacrylic acid (PAA) for EMI shielding application is reported. The MCNTs contribute to the generation of 3D porous structures and enhance the mechanical properties of composite hydrogel. The 3D porous structure and high electrical conductivity inherited from ultrahigh electrically conductive MCNTs enable excellent EMI shielding properties with a total shielding efficiency EMI SE (SET) value of 32.8 dB (>99.9%) at only 3 wt% filler content of MCNTs. The MCNTs/PAA hydrogels also display superior EMI shielding performance under a strong acidic environment with SET > 99.99% while the 3D porous structure remained intact. The combination of electron–ion system in pH solution enriches the charge transfer and accumulation, enabling dipole orientation and polarization that are favorable for enhancing EMI attenuation. Moreover, the porous structure of MCNTs/PAA also contributes to partial trapping and dissipation of EM radiation energy via multiple scattering phenomena. This work thus paves the way toward applications of 3D hierarchical network materials for EMI shielding applications in both land and aqueous environments.

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IR and Raman Investigation of Some Poly(acrylic) Acid Gels in Aqueous and Neutralized State

Cited by 81 publications

References 20 publications

Fabrication and characterization of centrifugally spun poly(acrylic acid) nanofibers

Fabrication and characterization of centrifugally spun poly(acrylic acid) nanofibers

Underwater Structurally‐Colored Adhesives for Visualized Adhesion Monitoring in Aqueous Media

pH‐Tunable 3D Interconnected Network of Multiwalled Carbon Nanotubes /Polyacrylic Acid Hydrogel with Excellent Electromagnetic Radiation Shielding Capability

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