Synthesis, characterisation and properties of α,β-poly(N-2-hydroxyethyl)-dl-aspartamide-graft-maleic anhydride precursors and their stimuli-responsive hydrogels

Dispenza, Clelia; Tripodo, Giuseppe; LoPresti, Caterina; Spadaro, Giuseppe; Giammona, Gaetano

doi:10.1016/j.reactfunctpolym.2009.03.010

Cited by 19 publications

(7 citation statements)

References 49 publications

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“…All hydrogels, though, undergo to slight shrinking at pH 9. In alkaline conditions, according to Gibbs-Donnan equilibria, the excess of hydroxyl ions in solution reduces the electron pair donation ability of water towards the polar groups of PVP and all samples rehydrate less [49,50]. In agreement with the calculated average network parameters for these materials, PVP-EB 25 presents almost doubled ERR values then PVP-EB 80.…”

Section: Morphological Investigation and Rehydration Behaviour Of Pvp Xerogelssupporting

confidence: 70%

Probing the internal environment of PVP networks generated by irradiation with different sources

et al. 2010

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Poly(N-vinyl-2-pyrrolidone) (PVP) hydrogels\ud have been synthesised from the aqueous solutions of the same linear polymer by two different radiation sources: electron beams and UV rays. The present investigation couples conventional hydrogel characterisation techniques with the study of the partition equilibria, fluorescence\ud behaviour and release of two different molecular probes,1-anilino-8-naphthalene sulphonate (ANS) and ThioflavinT (ThT). The two probes have comparable molecular weight and different structural and optical properties. The ‘chemical’ networks produced upon irradiation in different experimental conditions presented quite distinctive\ud mechanical spectra, yielded to different porous solids upon freeze-drying and showed specific rehydration ratios when ‘equilibrated’ in water. More interestingly, they offered ‘hydrophobic pockets’ to host the ANS molecules in a way that the probe is completely occluded from water, making it fluoresce. Conversely, the generated PVP networks did not show any specific affinity towards the hydrophilic ThT that was only barely untaken

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Section: Morphological Investigation and Rehydration Behaviour Of Pvp Xerogelssupporting

confidence: 70%

Probing the internal environment of PVP networks generated by irradiation with different sources

et al. 2010

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“…4-b) prepared in water and cross-linked by hydrazine. [25][26][27] As the ring of PSI has been attacked by base and crosslinker, the 5.2 ppm and 2.5-3.2 ppm proton shift numbers will decrease under the effect of the crosslinking structure. In the 1 H NMR spectrum of PASP, the typical proton chemical shifts at 4.4-4.6 ppm and 2.4-2.8 ppm are indicated, although the 3.0-2.6 ppm shift has decreased since the cross-linker is free of -NH-NH-groups.…”

Section: Effect Of the Methods Of The Solutionmentioning

confidence: 99%

Novel solvent-free synthesis and modification of polyaspartic acid hydrogel

et al. 2012

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Polyaspartic acid (PASP) hydrogel, a hydrolysis derivative of polysuccinimide (PSI), has been previously synthesized by using organic solvents such as dimethyl formamide (DMF) or dimethyl sulfoxide (DMSO), making the process environmentally and economically unattractive. The present paper presents a ''green'' synthesis, without using organic solvents. It demonstrates that hydrolysis and modification can be combined with in situ cross-linking. Introducing an aqueous soluble crosslinker, experimental results would broaden the application area of PASP at significantly reduced preparation cost, whilst moreover improving the required properties. The PASP hydrogel obtained by this method has a 600 g g 21 water-swelling ratio against 420 g g 21 as obtained by the conventional method using DMF. To reduce the ionic strength sensitivity of the hydrogel, sulfo-groups from, e.g. taurine, can be grafted onto the main chain of PASP and produce a modified PASP hydrogel with a 300 g g 21 water-swelling ratio in a 0.9% sodium chloride solution, against only 80 g g 21 for the nongrafted PASP hydrogel.

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“…6a. Namely, signals at about 6.54 and 6.24 ppm could be ascribed to the protons of vinyl groups (CH CH), indicating that ␤-CD-MAH bearing double bonds had been successfully prepared after esterfying reaction between ␤-CD and MAH [21]. However, they vanished in the spectrum of ␤-CD-MAH-TMAEMC, Fig.…”

Section: Characterization Of the Copolymermentioning

confidence: 96%

New amphoteric flocculant containing beta-cyclodextrin, synthesis, charaterization and decolorization properties

Wang

Tian

2010

Journal of Hazardous Materials

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Synthesis, characterisation and properties of α,β-poly(N-2-hydroxyethyl)-dl-aspartamide-graft-maleic anhydride precursors and their stimuli-responsive hydrogels

Cited by 19 publications

References 49 publications

Probing the internal environment of PVP networks generated by irradiation with different sources

Probing the internal environment of PVP networks generated by irradiation with different sources

Novel solvent-free synthesis and modification of polyaspartic acid hydrogel

New amphoteric flocculant containing beta-cyclodextrin, synthesis, charaterization and decolorization properties

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