Synthetische wasserlösliche polymere—stand und ausblick

Spoor, Herbert J.

doi:10.1002/apmc.1984.051230101

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…As representative examples, Fig. 6 shows the 1 H and (as an insert) 13 C NMR spectra of polymer 14b together with the full signal assignment.…”

Section: Precursor Synthesesmentioning

confidence: 99%

“…Using this spectrum, a full signal assignment is possible. As an example, one can see that -assuming the 13 C NMR signal at δ = 56.33 ppm corresponds to the N-CH 2 carbons directly attached to the nitrogen atom (C 16 Due to the fast proton-exchange processes it is impossible to quantify the degree of protonation in a partially protonated polymer using NMR spectroscopy in D 2 O. In order to correlate the obtained 1 H NMR data for each value of pH quantitatively with the degrees of protonation, supporting titration experiments were carried out using pH electrodes.…”

Section: Controlled Protonation Of Polymers 14cmentioning

confidence: 99%

“…Polyelectrolytes are key compounds in all living organisms as well as in many materials and processes of our daily life [1][2][3]. DNA [4][5][6][7][8] and xanthane [9][10][11][12] on the one hand, and flocculents, superabsorbers, ion exchangers and pharmaceutical polymers [1][2][3][13][14][15] on the other hand may serve as examples. In most cases, the polyelectrolytes develop their benefits only when either dissolved in water or when in close contact with an aqueous medium.…”

Section: Introductionmentioning

confidence: 99%

“…Representative 1 H and (insert)13 C NMR spectra of polymer 14b, recorded in CDCl 3 at room temperature; signal assignment is made according to the numbering shown in Schemes 10 and 11…”

mentioning

confidence: 99%

“…13 C NMR spectra (aliphatic region) of (A) deprotonated 40, (B) protonated 40, (C) deprotonated 14c and (D) protonated 15c, recorded in D 2 O at room temperature. The signal assignment is according to the numbering shown in Schemes 10 and 11…”

mentioning

confidence: 99%

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Syntheses and solution properties of water-soluble poly(p-phenylene)s bearing oligo(ethylene oxide) and trialkylamino side groups

2002

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Pd-catalyzed Suzuki coupling is used to prepare poly(p-phenylene)s (PPPs) bearing oligo(ethylene oxide)s (OEOs) and trialkylamino groups as lateral substituents. The OEO substituents require very specific reaction conditions during monomer synthesis - presumably due to their coordinating oxygen atoms - but do not affect the subsequent Pd-catalyzed polycondensation process. In contrast to this, the lateral amino groups lower the degree of polycondensation of the PPPs considerably when their nitrogen atom is placed in the β-position of the side chains. When there is a longer spacer group between the amino nitrogen and the aromatic ring to be coupled, however, high-molecular-weight PPPs can be obtained. Provided an appropriate substitution pattern and long OEO side chains are used, the resulting PPPs are readily soluble not only in organic solvents but even in aqueous media. For one of these PPPs, the degree of protonation has been determined as a function of pH, using 1H and 13C NMR spectroscopy as well as potentiometry. It is shown that the polymer is completely deprotonated at pH > 10.5 and quantitatively protonated at pH < 4.0.

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“…As representative examples, Fig. 6 shows the 1 H and (as an insert) 13 C NMR spectra of polymer 14b together with the full signal assignment.…”

Section: Precursor Synthesesmentioning

confidence: 99%

Section: Controlled Protonation Of Polymers 14cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Representative 1 H and (insert)13 C NMR spectra of polymer 14b, recorded in CDCl 3 at room temperature; signal assignment is made according to the numbering shown in Schemes 10 and 11…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Syntheses and solution properties of water-soluble poly(p-phenylene)s bearing oligo(ethylene oxide) and trialkylamino side groups

2002

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Optimierung der mechanischen Fest/Flüssig‐Trennung durch gezielten Einsatz makromolekularer Flockungsmittel

Kulicke

Budirahardjo

Prescher³

1989

Chemie Ingenieur Technik

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Korrosionsinhibierung bzw. ‐stimulation von Aluminiumpigmenten im alkalisch wäßrigen Medium durch Polyacrylsäuren

Müller

Schmelich

1994

Materials & Corrosion

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Blattchenformige Aluminiumpigmente (Aluminiumgehalt > 99.5%) werden in einem (iemisch aus Wasser und Butylglykol bei pH = 10 schncll unter Wasserstoffentwicklung korrodiert. Niedrigmolekulare Polyacrylsauren inhibieren bei einem Zusatz von 0,3-0.5 Gew.-oh die Korrosion von Aluminiumpigmentcn deutlich bcsscr als hochmolekulare. Bei sehr niedrigen Zusatzmcngen (0.05-0,l Gcw.-%) von Polyacrylsauren zeigen die niedrigmolekularen keine Wirkung, wahrend hochmolckulare die Korrosion stimulieren. D.h. hochmolekulare Polyacrylsauren haben jc nach Konzentration einc vollig gegensaitzliche Wirkung. Die Messung von gelostern Aluminium(II1) im Korrosionsrnedium durch Atomabsorptionsspek troskopie spricht fur die Bildung von (zumindest teilweise) loslichcn Alurninium(IT1)-Polyacrylat-Komplcxcn, wobei die Liislichkeit bei niedrigmolekularen Polyacrylsauren niedriger ist als bei hochmolekularen.Flakelike aluminium pigments (aluminium content > 99.5%) are corroded in a mixture of water and butyl glycol at pH = 10 by thc evolution of hydrogen. Low-molecular weight polyacrylic acids inhibit the corrosion of aluminium pigments with addition of 0.3-0.5 weight-% significantly better than high-molecular weight polyacrylic acids. By addition of very low amounts (0.05-0.1 weight-%) of polyacrylic acid the low-molecular ones show no effect whereas high-molecular polyacrylic acids stimulate the corrosion reaction. That means that high-molecular weight polyacrylic acids show a contrary action depending on their concentration. Thc measurement of dissolved aluminium(II1) by atomic absorption spectroscopy indicates the formation of (at least partial) soluble aluminium(II1)-polyacrylate-complexes whereby the solubility with addition of low-molecular wcight polyacrylic acids is lower than with high-molecular.

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Synthetische wasserlösliche polymere—stand und ausblick

Cited by 8 publications

References 19 publications

Syntheses and solution properties of water-soluble poly(p-phenylene)s bearing oligo(ethylene oxide) and trialkylamino side groups

Syntheses and solution properties of water-soluble poly(p-phenylene)s bearing oligo(ethylene oxide) and trialkylamino side groups

Optimierung der mechanischen Fest/Flüssig‐Trennung durch gezielten Einsatz makromolekularer Flockungsmittel

Korrosionsinhibierung bzw. ‐stimulation von Aluminiumpigmenten im alkalisch wäßrigen Medium durch Polyacrylsäuren

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