Hydroxyethyl Cellulose. II. IR Spectra and Their Relation with the Dielectric Properties of Hydroxyethyl Celluloses

Selim, I. Z.; Basta, Altaf H.; Mansour, Olfat Y.; Atwa, Aziza I.

doi:10.1080/03602559408015293

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…The area ratio of band 1375 and 2900 was assigned to be the relative CrI (O'Connor et al 1958;Nelson and O'Conner 1964;Selim et al 1994). The area ratio of band 3300 and 2900 was assigned to be the mean hydrogen bond strength (O'Connor et al 1958;Selim et al 1994).…”

Section: Determination Of the Degree Of Crystallinitymentioning

confidence: 99%

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Improving Accessibility and Reactivity of Celluloses of Annual Plants for the Synthesis of Methylcellulose

Farriol

2005

Cellulose

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Pretreatments (water-soaking, pre-mercerization, mercerization under a pressure of 15 bars and steam explosion) were used to improve the accessibilities and reactivities of celluloses of bleached flax, hemp, sisal, abaca and jute pulps for the synthesis of methylcellulose. Degrees of crystallinity were determined by X-ray Diffraction (XRD) spectra. The iodine adsorption accessibilities of pulps were low and accessible fractions ranged from 1.3 to 5.2%. Accessible fractions in amorphous cellulose were calculated in the 5-18% range. The accessibilities of these pulps were hemp pulp > flax pulp > sisal pulp > jute pulp > abaca pulp. Fourier Transform Infrared (FTIR) spectra showed that mean hydrogen bond strengths were weakened and relative crystallinity indexes were decreased by pretreatments. The accessibility and reactivity of the abaca pulp were improved by water soaking, mercerization under 15 bars pressure, steam explosion and preliminary mercerization, of which steam explosion and pre-mercerization were the best treatments. Species was the main factor for the accessibility and reactivity.

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Section: Determination Of the Degree Of Crystallinitymentioning

confidence: 99%

“…The area ratio of band 3300 and 2900 was assigned to be the mean hydrogen bond strength (O'Connor et al 1958;Selim et al 1994).…”

Section: Determination Of the Degree Of Crystallinitymentioning

confidence: 99%

Improving Accessibility and Reactivity of Celluloses of Annual Plants for the Synthesis of Methylcellulose

Farriol

2005

Cellulose

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“…In the disordered regions, molecular or dipolar polarization will also be influenced by the proximity and configuration of adjacent molecules. The decrease in crystallinity promotes disorder, molecules are less related, and therefore a higher dielectric constant was achieved [39]. We can note from Table 2 that crystallinity in our samples does not really affect the dielectric constant of paper; there is no clear relationship between the two variables.…”

Section: Unloaded Handsheetsmentioning

confidence: 81%

Dielectric Properties of Paper Made from Pulps Loaded with Ferroelectric Particles

Omari

Zyane

Belfkira

et al. 2016

Journal of Nanomaterials

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Due to its physical properties and its ease of manufacture, paper is widely used in various engineering applications such as electrical insulation materials for components in high voltage technology. In this study, paper loaded with ferroelectric nanoparticles (BaTiO3and SrTiO3) was made with fibers obtained from plants growing on the Moroccan soil [Halfa (Stipa tenacissima), Agave (Agave americana), Pennisetum (Pennisetum alopecuroides), Typha (Typha latifolia), and Junc (Juncus effusus)] and two commercial pulps (bleached softwood Kraft and newsprint grade thermomechanical pulps). A retention aid, cation polyacrylamide (Percol 292), was necessary to retain ferroelectric particles in the fibrous network and improve the dispersion of strontium titanate particles. The different pulp and handsheets used were characterized according to standard methods (Pulp and Paper Technical Association of Canada, PAPTAC). It is well known that annual and perennial plants contain high percentages of fines (length < 0.2 mm) and short fibers. The results show that there is a strong interdependence between the dielectric properties of the loaded paper and surface finish, porosity, dispersion level of ceramic particles, fines content, shape, conformability, and sheet formation. The single dielectric relaxation detected towards low frequencies is attributed to hydroxyl groups present on fiber surfaces, in ceramic particles and adsorbed water.

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“…35 The broadening of the band in the region of wavenumbers of 3700−3000 cm −1 reveals that the hydroxyl groups are not free and undergo a different mode of hydrogen bonding, characterized by polymeric association, resulting in weaker bonded OH groups. 36 In addition, a broad and distinct band in the 1222−950 cm −1 region is observed in the spectrum of HEC, which is a characteristic of the stretching vibrations of C−O−C. In contrast, when examining the HEC-Au microplates, it was observed that the O−H stretching vibration was weak, the absorption peak intensity of the C−H stretching vibration was low, and the intensities of the absorption bands at 1352 and 1047 cm −1 were significantly reduced.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Hydroxyethylcellulose-Directed Synthesis of Gold Microplates with Hydrogen Peroxide in an Aqueous Phase

He,

Shen,

Ren

et al. 2024

ACS Omega

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In this study, we successfully synthesized well-defined polygonal gold microplates for the first time in an aqueous phase using hydroxyethylcellulose (HEC) in the presence of hydrogen peroxide (H 2 O 2 ). HEC played a pivotal role during the synthesis, acting not only as a biotemplate but also as an in situ reduction site for the nucleation and growth of gold (Au) microplates. H 2 O 2 played a crucial role in accelerating the growth of Au microplates from the Au nucleus. This methodology is ecofriendly and easy to operate and has potential applications in various fields, such as electronics, photonics, and biotechnology.

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Hydroxyethyl Cellulose. II. IR Spectra and Their Relation with the Dielectric Properties of Hydroxyethyl Celluloses

Cited by 19 publications

References 6 publications

Improving Accessibility and Reactivity of Celluloses of Annual Plants for the Synthesis of Methylcellulose

Improving Accessibility and Reactivity of Celluloses of Annual Plants for the Synthesis of Methylcellulose

Dielectric Properties of Paper Made from Pulps Loaded with Ferroelectric Particles

Hydroxyethylcellulose-Directed Synthesis of Gold Microplates with Hydrogen Peroxide in an Aqueous Phase

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