A New Macroporous Luminescent Hydrogel from Poly(allylamine)

Das, Rupasree Ragini; Samal, Shashadhar; Choi, Soobong; Geckeler, Kurt E.

doi:10.1002/1521-3927(20010701)22:11<850::aid-marc850>3.0.co;2-w

Cited by 8 publications

(3 citation statements)

References 8 publications

(8 reference statements)

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“…Even at high concentrations, PAA does not gel liquids in the absence of cross-linkers . However, it can be transformed into a macroporous hydrogel when cross-linked . Thus, we conjectured that PAA may be a “latent” gellant: 7,8 bubbling CO 2 through its solutions and formation of carbamate and ammonium centers might “cross-link” PAA chains through interchain ion-paired centers if they were present along with intrachain centers (eq 2).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Gels from Polyallylamine and Carbon Dioxide as Gellant

et al. 2003

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The synthesis and characterization of a novel series of polymer gels are reported. They are formed at ambient temperatures by bubbling CO(2) through solutions of polyallylamine (PAA; a latent gellant) in several organic liquids, including aliphatic alcohols and 1-methyl-2-pyrrolidone. The stabilities of the alcohol gels, as indicated by the (irreversible) degelation temperature, T(g)(dt), were strongly dependent on the number of carbon atoms (C(n)) in the alkyl chains of the alcohol liquids. The mechanism of formation and the microenvironmental properties of PAA-based gels containing a small amount of a pH-sensitive probe, 2,6-naphthalenedicarboxylic acid (2,6-NDCA), have been probed using static and dynamic fluorescence measurements. A measurable pH change and significant alterations to the fluorescence spectra were coincident with gelation of PAA solutions in 1-butanol as CO(2) was bubbled through, and the fluorescence spectra were monitored over several hours until no further changes were detected. Analyses of dynamic fluorescence decay histograms indicate the presence of three decay times due to different microenvironments where the 2,6-NDCA molecules are located.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Gels from Polyallylamine and Carbon Dioxide as Gellant

et al. 2003

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“…Although hydrogels formed by crosslinked polyallylamine are known,37–43 none has been shown to be antimicrobial. Here, we report on antimicrobial hydrogels formed by crosslinking polyallylamine with several aldaric acid derivatives.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial hydrogels formed by crosslinking polyallylamine with aldaric acid derivatives

Andrews

Figuly

Chapman

et al. 2010

J of Applied Polymer Sci

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Aqueous dispersions (0.1 wt %) of hydrogels 1 and 5-formed by crosslinking polyallylamine hydrochloride (MW 60,000) with aldaric acid derivatives, diethyl L-tartrate and N,N 0 -bis(methoxycarbonylmethyl)-D-glucaramide, respectively-exhibited complete (log 5) kill within 4 h of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Candida albicans suspended in culture medium. This antimicrobial activity was much higher than that of uncrosslinked polyallylamine (1 wt % killed only 75% of E. coli in 24 h). When dispersed at 10 and 100 ppm, hydrogel 5 displayed complete (log 5) kill of E. coli within 30-60 and 15 min, respectively. Hydrogels 1 and 5 were active against S. aureus and Salmonella choleraesuis dried on hard stainless steel surfaces and accelerated the deaths of E. coli, P. aeruginosa, S. aureus, and C. albicans in a model skin cream formulation. A 0.8% aqueous dispersion of hydrogel 5 was also effective as a hand sanitizer, killing 99.7% of Serratia marcescens on human hands within 5 min. Hydrogels 1 and 5 caused no dermal irritation or allergic contact sensitization under the conditions of a human repeat insult patch test.

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“…Motivated by these approaches introduced in our laboratory in association with our extensive experience with polymeric materials, [25,27,32,33] we attempted to expand this idea to the solubilization or dispersion of SWNTs with polymers, in turn facilitating the preparation of SWNT-polymer composites. In this study, we used poly(allylamine) [34] (PAL), which is a water-soluble polymer containing complexing moieties as an integral part of its structure, for dispersing a high concentration of individual SWNTs in an aqueous solution by a noncovalent approach. PAL is nontoxic and utilized extensively in chemical and biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

A Facile Approach to Single‐Wall Carbon Nanotube/Poly(allylamine) Nanocomposites

Kim

Premkumar

Lee

et al. 2007

Macromol. Rapid Commun.

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A facile approach to polymer nanocomposites with single‐wall carbon nanotubes and cationic polymers is reported. The composite material was synthesized by producing carboxylic acid groups at the nanotube termini followed by a reaction with poly(allylamine) in water. Fourier transform infrared spectral and thermogravimetric analyses corroborate that the poly(allylamine) chains were wrapped on the surface of the carbon nanotubes. The scanning electron microscopic (SEM) image shows that the nanotubes were dispersed with little aggregation, thus, strongly suggesting that the poly(allylamine) chains have covered the single‐wall carbon nanotubes, which was further evidenced by transmission electron microscopy. The composites are soluble in water, and this solubilization process opens up new opportunities in the solution chemistry on pristine nanotubes.

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A New Macroporous Luminescent Hydrogel from Poly(allylamine)

Cited by 8 publications

References 8 publications

Synthesis and Characterization of Gels from Polyallylamine and Carbon Dioxide as Gellant

Synthesis and Characterization of Gels from Polyallylamine and Carbon Dioxide as Gellant

Antimicrobial hydrogels formed by crosslinking polyallylamine with aldaric acid derivatives

A Facile Approach to Single‐Wall Carbon Nanotube/Poly(allylamine) Nanocomposites

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