Pulsed NMR studies of translational mobility of polymer molecules in polydialkylphosphate gels

Litowska, M.

doi:10.1007/bf01418195

Cited by 4 publications

(4 citation statements)

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“…The spectra were approximated by the superposition of two Lorentzian lines: a narrower line (L 1) corresponding to more mobile hydrate water protons and a broader one (L 2) of less mobile polymer protons. As it results from our previous paper [3], there is no exchange between polymer and water protons. Therefore, the areas of the separated lines are proportional to the amount of the two dif- The amount of bound water in PPP gels depends strongly on the kind of counterions.…”

Section: Bound (Nonfreezing) Water In Ppp Gelsmentioning

confidence: 60%

“…This indicates the lower mobility of hydrate water molecules than in gels of PPP in its acid form. The restriction of translational motion of water molecules owing to the transition of PPP from the acid to a magnesium salt form was observed in our previous studies [3].…”

Section: 'Apparent" Phase Transition Of Hydrate Water In Ppp Gelsmentioning

confidence: 70%

“…The results of pulsed HNMR studies of synthetic poly(1,3 propylenephosphate) hydration, a simplified model for membrane teichoic acids, appearing in gram-positive bacteria, have been published earlier [1][2][3]. The results of temperature investigations of the longitudinal and transverse relaxation and translational mobility of water and polymer molecules in PPP gels have mainly given us an insight into the dynamics of molecular motion within the gels.…”

Section: Introductionmentioning

confidence: 97%

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Hydration of synthetic polypropylenephosphate (PPP) ? a simplified model for natural teichoic acids Part 3. Bound (nonfreezing) water in PPP gels by the pulsed Fourier transform NMR method

Litowska

Döhler

1987

Colloid & Polymer Sci

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Abstract:The structure and properties of bound water, nonfreezing at low temperature, in polypropylenephosphate (PPP) gels have been studied by the pulsed Fourier transform NMR method. The amount of hydrate water in gels depends strongly on the type of counterions. For PPP in acid and magnesium salt forms this amount was found to be three and eight moles per one mole of phosphate groups, respectively. The shape of a resonance line of bound water protons at low temperature was approximated by the curve of the system of proton pairs of statistically distributed orientations. The distance between two interacting protons in a pair, calculated from NMR spectrum, corresponds to the H-H distance in an isolated water molecule. This means that hydrate water molecules are fixed at hydration sites of polymer phosphate groups at a distance limiting intermolecular proton-proton interaction. The analysis of the NMR signal shape confirms thatthe structures of the primary hydration layer of phosphodiester groups, proposed in our previous theoretical studies, exist in PPP gels.

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Section: Bound (Nonfreezing) Water In Ppp Gelsmentioning

confidence: 60%

Section: 'Apparent" Phase Transition Of Hydrate Water In Ppp Gelsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 97%

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Hydration of synthetic polypropylenephosphate (PPP) ? a simplified model for natural teichoic acids Part 3. Bound (nonfreezing) water in PPP gels by the pulsed Fourier transform NMR method

Litowska

Döhler

1987

Colloid & Polymer Sci

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“…In this paper we present K349 and discuss the conductivity data for PPP of the polymerization degree n from 3 to 10.5. The PPP samples of low molecular weight have been used in our and other experiments [6][7][8] because naturally occurring TA exhibit relatively low values of n, ranging from 8 to 65 alkylene phosphate units in the polymeric chain. From these results, information about the interaction of phosphate anions with mono-and divalent cations could be obtained.…”

Section: Introductionmentioning

confidence: 99%

Electrolytic conductivity of poly(1,3-propylene phosphate) solutions containing mono- and divalent-counterions

Ostrowska-Czubenko

Wódzki

1988

Colloid & Polymer Sci

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Abstract:The results of conductivity measurements for aqueous solutions of poly(1,3-propylene phosphate) (PPP), which can be considered as a synthetic analogue of naturally occurring teichoic acids, are reported. Experiments were carried out with oligomeric fractions of a polymer in acidic, sodium, potassium, magnesium and calcium forms. The concentration and molecular weight dependence of the equivalent conductivity of PPP was analysed and the limiting equivalent conductivity determined. From the con= ductivity data, the polyion-counterion interaction parameter F and the equivalent conductivity of a polyion,~p were calculated. It was shown that both F and ~p depend on polyelectrolyte solution concentration and molecular weight of PPP. Conclusions concerning mono-and divalent metal ions binding to PPP are drawn.

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Polyesters of phosphoric acid: Synthesis and kinetics of hydrolysis

Penczek

Pretula

Kałużyński

1998

Macromolecular Symposia

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Three major methods have been elaborated in our laboratory for preparation of polymers with poly(alkylene phosphates) backbones: ring‐opening polymerization, poly‐condensation and transesterification, and polyaddition. The second method is based on the reaction of the commercially available compounds, namely dialkyl (or diaryl)‐H‐phosphonates and glycols. Reaction of the aliphatic H‐phosphonates with aliphatic glycols is a reversible process, whereas polycondensation of diphenyl H‐phosphonates with aliphatic and cycloaliphatic diols is practically irreversible. This latter method has recently been developed and is described in this paper. Poly H‐phosphonates with M̄n up to 40–103 were prepared. Polymers are easily oxidized and quantitatively converted into the relatively stable poly(alkylene phosphates). Some physical properties of these polymers and kinetics of their hydrolysis is discussed.

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Pulsed NMR studies of translational mobility of polymer molecules in polydialkylphosphate gels

Cited by 4 publications

References 7 publications

Hydration of synthetic polypropylenephosphate (PPP) ? a simplified model for natural teichoic acids Part 3. Bound (nonfreezing) water in PPP gels by the pulsed Fourier transform NMR method

Hydration of synthetic polypropylenephosphate (PPP) ? a simplified model for natural teichoic acids Part 3. Bound (nonfreezing) water in PPP gels by the pulsed Fourier transform NMR method

Electrolytic conductivity of poly(1,3-propylene phosphate) solutions containing mono- and divalent-counterions

Polyesters of phosphoric acid: Synthesis and kinetics of hydrolysis

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