The effect of trivalent metal nitrates on the properties of dental cements made from poly(acrylic acid)

Nicholson, John W.

doi:10.1002/(sici)1097-4628(19981219)70:12<2353::aid-app7>3.0.co;2-6

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…To better understand the mechanism of interaction between the Cu 2+ ions and the MAA units, FTIR analysis was performed (Figure ). The addition of Cu(OAc) 2 to the copolymer dissolved in methanol led to a new peak at 1620 cm −1 that grows with increasing copper acetate concentration, corresponding to bridging bidentate complexation of the MAA groups with Cu 2+ ions . No peaks associated with ionic (1575 cm −1 ) or chelating bidentate interactions (1560 cm −1 ) were observed.…”

Section: Resultsmentioning

confidence: 97%

Spontaneous Self‐Assembly and Micellization of Random Copolymers in Organic Solvents

Sadeghi

Asatekin

2017

Macro Chemistry & Physics

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Spontaneous self‐assembly of random and statistical copolymers in solution, especially in organic solvents, is unusual due to the structural irregularity of the copolymer chain and close proximity of short incompatible segments. This study describes the first observation of supramolecular structures such as micelles and vesicles formed by a random copolymer in organic solvents. Upon dissolution in methanol or tetrahydrofuran, the random copolymer poly(trifluoroethyl methacrylate‐random‐methacrylic acid) forms small spherical micelles, worm‐like assemblies, and large vesicles spontaneously. Self‐assembly is driven by the high incompatibility between the fluorinated and acidic repeat units. Micelle size can also be altered by the addition of metal ions, which interact with the carboxylic acid groups of methacrylic acid through complexation or Coulombic forces. These findings demonstrate an easy, single‐step approach to creating nanoscale structures with tunable size and morphologies in organic solvents from easily synthesized random copolymers, with potential applications in coatings, selective membranes, catalysis, and drug delivery.

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Section: Resultsmentioning

confidence: 97%

Spontaneous Self‐Assembly and Micellization of Random Copolymers in Organic Solvents

Sadeghi

Asatekin

2017

Macro Chemistry & Physics

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“…This increases the concentration of hydrogen ions, hence decreasing pH. For example, 1 mol dm −3 aluminium nitrate solution reduced the pH of poly(acrylic acid) solution from 1.5 to 0.2 [44].…”

Section: The Effect Of Organic Additives On Conventional Glass-ionomementioning

confidence: 99%

The effect of antimicrobial additives on the properties of dental glass-ionomer cements: a review

Tüzüner

Dimkov

Nicholson

2019

Acta Biomaterialia Odontologica Scandinavica

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Aim: The aim of this article is to review the literature on the use of antimicrobial additives in glass-ionomer dental cements.Method: An electronic search between 1987 and the end of 2017 was performed using PubMed, Web of Science and Google search engines with the terms glass-ionomer, glass polyalkenoate, antibacterial and antimicrobial as the key words. The search was refined by excluding the majority of references concerned with cement antimicrobial properties only. Extra papers already known to the authors were added to those considered.Results: A total of 92 relevant articles have been cited in the review of which 55 are specifically concerned with the enhancement of antibacterial properties of glass-ionomers, both conventional and resin-modified, with additives. In addition, information is included on the uses of glass-ionomers and the biological properties of the antibacterial additives employed. There are several reports that show that additives are typically released by diffusion, and that a high proportion is usually left behind, trapped in the cement. Additives generally increase setting times of cements, and reduce mechanical properties. However, smaller amounts of additive have only slight effects and the longer-term durability of cements appears unaffected.Conclusion: Modified glass-ionomer cements seem to be acceptable for clinical use, especially in the Atraumatic Restorative Treatment (ART) technique.

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“…For Fe(NO 3 ) 3 the converse is the case 15. In association with poly(acrylic acid) it shows a band at 1526 cm −1 , corresponding to chelate bidentate geometry, and a band at 1632 cm −1 , assigned tentatively to unidentate coordination, but possibly arising instead from either atmospheric location or retained water.…”

Section: Resultsmentioning

confidence: 93%

“…It was slower, taking 2–3 min for the entire solution to be converted from a relatively mobile liquid to a soft gel. Poly(acrylic acid), on the other hand, underwent a much more rapid reaction and formed two phases,15 with the precipitated phase a fairly stiff gel. Poly(acrylic acid) with FeCl 3 is known for similar behavior 22…”

Section: Resultsmentioning

confidence: 99%

“…The experimental techniques used in the current study were infrared spectroscopy and pH determination. These techniques have been employed previously14, 15 to demonstrate that poly(acrylic acid) increases its ionization in the presence of di‐ and trivalent salts and that these salts form distinctly site‐bound complexes, the detailed stereochemistry of which has been determined. The present study was carried out with the aim of examining how interactions of salts with poly(acrylic acid–maleic acid) compare with those that occur with an acrylic acid homopolymer.…”

Section: Introductionmentioning

confidence: 99%

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Metal salts interaction with acrylic acid-maleic acid copolymer: An infrared spectroscopic study

Nicholson¹

2000

J. Appl. Polym. Sci.

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A study was carried out in which aqueous solutions of acrylic acid–maleic acid copolymer (mole ratio of monomers: 3:2) were diluted with solutions of various salts [NaCl, MgCl2, CaCl2, SrCl2, ZnCl2, Al(NO3)3 and Fe(NO3)3]. This copolymer was found to interact with all these salts to make solutions of enhanced acidity that infrared spectroscopy suggested was a result of charge stabilization of the polyanion by counterions occupying atmospheric or site‐bound locations. The cations of the salts NaCl, MgCl2, CaCl2 and SrCl2 appeared to occupy atmospheric positions only; in contrast, with poly(acrylic acid) they showed some site binding. Zinc ions, on the other hand, gave identical bridging bidentate interactions with both polymers. The cations from the trivalent salts Al(NO3)3 and Fe(NO3)3 were atmospheric and site bound (bridging bidentate), respectively, and these were also different from their interactions with poly(acrylic acid). The addition of Fe(NO3)3 to the copolymer caused gelation, as with poly(acrylic acid), but formation of the gel was slower and did not result in phase separation. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1680–1684, 2000

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The effect of trivalent metal nitrates on the properties of dental cements made from poly(acrylic acid)

Cited by 8 publications

References 16 publications

Spontaneous Self‐Assembly and Micellization of Random Copolymers in Organic Solvents

Spontaneous Self‐Assembly and Micellization of Random Copolymers in Organic Solvents

The effect of antimicrobial additives on the properties of dental glass-ionomer cements: a review

Metal salts interaction with acrylic acid-maleic acid copolymer: An infrared spectroscopic study

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