Novel linear–globular thermoreversible hydrogel ABA type copolymers from dendritic citric acid as the A blocks and poly(ethyleneglycol) as the B block

Namazi, Hassan; Adeli, Mohsen

doi:10.1016/s0014-3057(02)00385-3

Cited by 106 publications

(86 citation statements)

References 39 publications

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“…Possible carboxylic protons could not be observed due to a dimerization effect due to H bonding betwen the carboxylic acids. However amidic protons at 4.09 ppm, dendritic protons at 1.85 and 3.69 ppm respectively, and repeating units protons of PEG at 2.19 ppm were correlated with previous studies [14][15][16]. 1 H NMR spectra of PEG-HA…”

Section: Resultssupporting

confidence: 87%

“…First Newkome type three branched dondron, (di-tert-butyl 4-amino-4-(3-tert-butoxy-3-oxopropyl)heptanedioate), was synthesized [14]. This dendron was successfully coupled with freshly chlorinated PEG dicarboxylic acid [15]. The subsequent hexaester was hydrolyzed from the esteric groups to make it water soluble.…”

Section: Resultsmentioning

confidence: 99%

“…In the present work, A newkome type dendron, di-tert-butyl 4-(2-(tert-butoxycarbonyl)-ethyl)-4-aminoheptanedioate [14], was coupled with freshly prepared PEG dicarboxylic acid chloride [15]. Formed PEG coored dendritic hexa ester was hydrolysed to obtain proton conducting dendritic gel electrolytes consisting of an acidic group, PEG cored dendritic hexa acid, which is abbreviated as PEG-HA (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and proton conductivity of anhydrous dendritic electrolytes

2007

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Water soluble PEG cored dendritic hexa-acid which comprises peripheral carboxylic acidic groups were prepared via nucleophilic substitution reactions. Novel anhydrous proton conducting electrolytes were prepared by incorporation of the heterocyclic protogenic solvent imidazole (Im) into PEG cored dendritic hexa acid, (PEG-HA), at several molar ratios of Im to -COOH units of PEG-HA. The complexation of PEG-HA and Im was illustrated by infrared spectroscopy (FT-IR). The materials are thermally stable up to 150• C as evidenced by thermogravimetry analysis (TGA). Differential scanning calorimetry (DSC) results verified that the organic electrolytes are homogeneous and amorphous. The proton conductivities were characterized by means of AC impedance spectroscopy and a maximum conductivity of 1 × 10 −3 S/cm was measured at 120• C in the anhydrous state.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and proton conductivity of anhydrous dendritic electrolytes

2007

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“…Furthermore, other research has utilized surfactants (23), macromolecules (24), or dilute acids (25) Linear-dendritic copolymers are hybrid macromolecules containing linear polymers and dendrimers (26,27). Poly (citric acid) (PCA)-poly (ethylene glycol) (PEG)-PCA copolymers containing hyperbranched dendritic citric acid parts (with a large number of OH functional groups in their structures) and linear PEG as flexible part (which enhances the solubility) could be effective as a template and stabilizer in water for the synthesis of NPs (28,29). In this study, PCA-PEG-PCA dendritic macromolecules have been used to synthesize magnetic NPs.…”

Section: Introductionmentioning

confidence: 99%

Modified chemical coprecipitation of magnetic magnetite nanoparticles using linear–dendritic copolymers

Zarnegar

Safari

2017

Green Chemistry Letters and Reviews

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In this investigation, magnetite nanoparticles (Fe 3 O 4 NPs) with a diameter of 5-10 nm were synthesized by coprecipitation from an alkaline solution of ferrous/ferric mixed salt-solution in the presence of copolymers. In this process, linear-dendritic copolymers containing a linear poly (ethylene glycol) core and dendritic poly (citric acid) arms were used as the stabilizer. The Fe 3 O 4 NPs were characterized by transmission electron microscopy, energy-dispersive spectra, X-ray powder diffraction, field emission scanning electron microscopy, Fourier transform infrared spectrometer, and vibrating sample magnetometer. Compared to classical coprecipitation, the results showed that uniform, ultrafine, nearly spherical, and high purity nano-magnetite particles with better magnetic properties could be prepared by this method. ARTICLE HISTORY

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“…The same group also prepared citric acid-polyethylene glycol-citric acid (CPEGC) triblock dendrimers as biocompatible compounds up to the third generation, and investigated them as potential drug-delivery systems [156,157]. The preparation of a second-generation dendrimer of this type is shown in Scheme 3.…”

Section: Methodsmentioning

confidence: 99%

Polyester Dendrimers: Smart Carriers for Drug Delivery

Twibanire

Grindley

2014

Polymers

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Polyester dendrimers have been shown to be outstanding candidates for biomedical applications. Compared to traditional polymeric drug vehicles, these biodegradable dendrimers show excellent advantages especially as drug delivery systems because they are non-toxic. Here, advances on polyester dendrimers as smart carriers for drug delivery applications have been surveyed. Both covalent and non-covalent incorporation of drugs are discussed.

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Novel linear–globular thermoreversible hydrogel ABA type copolymers from dendritic citric acid as the A blocks and poly(ethyleneglycol) as the B block

Cited by 106 publications

References 39 publications

Synthesis and proton conductivity of anhydrous dendritic electrolytes

Synthesis and proton conductivity of anhydrous dendritic electrolytes

Modified chemical coprecipitation of magnetic magnetite nanoparticles using linear–dendritic copolymers

Polyester Dendrimers: Smart Carriers for Drug Delivery

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