NMR 13C study of the structure of polyethyleneimine

Луковкин, Г.М.; Pshezhetsky, V. S.; Murtazaeva, G.A.

doi:10.1016/0014-3057(73)90039-6

Cited by 55 publications

(34 citation statements)

References 3 publications

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“…The NMR spectrum shows characteristic signals for the CH 2 groups that were assigned according to previous works. 19,21,22 The ratio of 3°, 2°, and 1°a mino groups in the polymer could be calculated from the signal integrals as follows:…”

Section: Polymer Preparation and Characterizationmentioning

confidence: 99%

Boric acid recovery using polymer filtration: Studies with alkyl monool, diol, and triol containing polyethylenimines

Smith

Robison

Carlson

et al. 2005

J of Applied Polymer Sci

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Three water-soluble polymers containing linear alkyl monool, 1,2-diol, and 1,2,3-triol groups, mostly on the primary amines of polyethylenimine, were synthesized, characterized, and tested for their ability to recover boric acid. The boron-binding capacities of these polymers and the backbone polyethylenimine were determined by titration, ultrafiltration, and inductively coupled plasma/ atomic emission spectroscopy analysis. At low boron concentrations, the 1,2,3-triol polymer performed better than the 1,2-diol, whereas at high boron concentrations, the 1,2-diol outperformed the 1,2,3-triol.11 B-NMR spectroscopy and retention studies with various salt concentrations indicated that boron interacted with these two polymers by means of ion pairing with the protonated amines and by borate ester formation. For the monool and the polyethylenimine backbone, the mechanism for boron binding was ion pairing only. These polymers are under consideration for the selective recovery and recycling of enriched boric acid used in the primary coolant loop of pressurized water nuclear reactors.

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Section: Polymer Preparation and Characterizationmentioning

confidence: 99%

Boric acid recovery using polymer filtration: Studies with alkyl monool, diol, and triol containing polyethylenimines

Smith

Robison

Carlson

et al. 2005

J of Applied Polymer Sci

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“…The general shape of the curves is the same for all data sets and is typical of hyperbranched polymers. 12,17 The q-position of the maximum is correlated with the mean radius of gyration as q max R g ) 6 and slightly shifted to lower q with increasing degree of derivatization.…”

Section: Entries 1-4)mentioning

confidence: 99%

Core−Shell-Structured Highly Branched Poly(ethylenimine amide)s: Synthesis and Structure

et al. 2005

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The synthesis of amphiphilic macromolecules by amidation of hyperbranched polyethylenimine was studied. Amidation with palmitic acid or the methyl ester proceeds up to 84% degree of amidation (140°C, vacuum). The primary amine end groups react preferentially. With carbonyldiimidazole (CDI)-activated acids nearly complete conversion of all primary amine end groups and secondary amine linear units can be achieved; with a corresponding limited amount of CDI the end groups can be amidated selectively. The products of these reactions are free of any unreacted carboxylic acid or other impurities ( 1 H and 13 C NMR) and can be optionally purified by pressure ultrafiltration washing with a toluene/ amine solution. Side-chain crystallization is observed (DSC), which can be supressed entirely employing branched alkyl moieties (2-hexyldecanoic acid as amidating agent). Solution structures were studied by SANS. In C6D6 radii of gyration of 2-5 nm (Guinier analysis) were observed for samples differing in PEI core molecular weight. These sizes and their observed independence of concentration in the range of 5-40 g L -1 indicate the presence of nonaggregated unimolecular inverted micelles.

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“…The signal assignment was discussed in literature. 25,26 The representative peak of the methyl groups of the ammonium moiety at 54 ppm (signal 18, cf. Scheme 2) overlaps with the signal of the methylene group of the PMMA macromolecules (signal 8, cf.…”

Section: Thementioning

confidence: 99%

Synthesis and characterization of new poly(ethyleneimine)‐g‐poly(methyl methacrylate) star‐block copolymers with hyperbranched cationic core

Beckmann

Beginn

2013

J. Polym. Sci. Part A: Polym. Chem.

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Hyperbranched polyethyleneimine (hb-PEI) is used as polymeric scaffold to synthesize new PEI-g-polymethylmethacrylate (PEI-g-PMMA) block copolymers, consisting of a hyperbranched, partially quarternized cationic core, and PMMA-arms. The arms are grafted to the PEI scaffold by means of the "grafting to" method. Ammonium groups, covalently bond to the hyperbranched core, provide good adhesion to negatively charged surfaces, even in case of low-surface charges. The PMMA strands provide compatibility of the macromolecules to PMMA matrices, hence generating potential dispersants, and compatibilizers for PMMA. A peculiar association behavior in organic solution is observed as supported by dynamic light scattering and DOSY measurements. First evidences of the applicability of the macromolecules as dispersants to prepare PMMA-nanocomposites are given.

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NMR 13C study of the structure of polyethyleneimine

Cited by 55 publications

References 3 publications

Boric acid recovery using polymer filtration: Studies with alkyl monool, diol, and triol containing polyethylenimines

Boric acid recovery using polymer filtration: Studies with alkyl monool, diol, and triol containing polyethylenimines

Core−Shell-Structured Highly Branched Poly(ethylenimine amide)s: Synthesis and Structure

Synthesis and characterization of new poly(ethyleneimine)‐g‐poly(methyl methacrylate) star‐block copolymers with hyperbranched cationic core

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