Molecular dynamics of poly(ethylene glycol)s studied by optical Kerr effect and Brillouin spectroscopy

Drozdowski, M.; Błaszczak, Zdzisław; Iwaszkiewicz-Kostka, Iwona; Ziobrowski, P.; Andrzejewska, Ewa; Andrzejewski, Maciej

doi:10.1016/s0022-2860(02)00238-7

Cited by 10 publications

(10 citation statements)

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“…Recently, a systematic study of conformational properties and molecular dynamics in the series of PEG's with various molecular mass has been undertaken, using Brillouin light scattering and optical Kerr methods and also using the computer simulations [1,3,4,7]. The aim of this study was to determine the structural changes in crystalline polyoxyethyleneglycol and their water solutions by the Raman and Rayleigh light scattering methods.…”

Section: Introductionmentioning

confidence: 99%

Raman and Rayleigh scattering study of crystalline polyoxyethyleneglycols

Kozielski¹,

Muhle

Błaszczak

et al. 2005

Cryst. Res. Technol.

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Results of the study of Raman and Rayleigh scattering in crystalline polyoxyethyleneglycols (PEG) and PEG 1500 aqueous solution are reported. The conformational changes of the polymer chain have been studied as a function of PEG water solution concentration and molecular weight. Intensity ratios of the gauche and trans conformation around C-C and C-O bonds have been estimated from the Raman spectra. Moreover, from the Raman band parameters the values of the order parameters versus aqueous solution concentration have been determined. The influence of an external electric field on these parameters has been analysed. Mutual orientation of polyoxyethyleneglycol chains in the crystalline and liquid state has been studied on the basis of the angular correlation parameters obtained from the Rayleigh band intensity as a function of aqueous solution concentration and molecular weight.

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Section: Introductionmentioning

confidence: 99%

Raman and Rayleigh scattering study of crystalline polyoxyethyleneglycols

Kozielski¹,

Muhle

Błaszczak

et al. 2005

Cryst. Res. Technol.

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“…Thus, with a decrease in PEG chain length, contribution of PEG to gelation decreases which results in insoluble polymers. Molecularly, conformation of PEG changes from molecular aggregates to statistical coils as chain length increases which enables lengthy PEG chains to imbibe more solvent molecules within the interstitial spaces to support the gelation. In addition, inability of DTH end capped low molecular weight PEG to form gels can be explained by phase mixing of urethane linkages in DTH and hexamethylene segments with PEG, a characteristic feature observed in low‐molecular weight polyether polyurethanes .…”

Section: Resultsmentioning

confidence: 99%

Gelation characteristics and applications of poly(ethylene glycol) end capped with hydrophobic biodegradable dipeptides

Krishnan

Yuan

Sarkar

2014

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

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Poly(ethylene glycol) (PEG) end capped with biodegradable hydrophobic dipeptides shows versatile gelation behavior in a wide range of aqueous and organic solvents. This gelation characteristic is attributed to the aggregation of polymer chains induced by dipeptide end groups. Both PEG molecular weight and molecular structure of end groups control this aggregation by striking a balance between two opposing molecular interactions: solubility of the PEG segment which tends to dissolve the polymer while hydrophobic and intermolecular noncovalent interactions between the end groups induce aggregation. Morphologically, this aggregated structure forms interpenetrating nano sheets with characteristic microstructural features. These gels are biodegradable and possess physicomechanical characteristics suitable for biomedical applications. Furthermore, proteins and hydrophobic model drugs can be encapsulated within the gels from aqueous and organic solvents, respectively, and can be released in a controlled fashion which indicates the applicability of the gels as drug delivery vehicles.

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“…In the Brillouin experiment we used spectrometer described in details elsewhere [19]. As a source of exciting light an argon laser (Carl Zeiss -Jena, Model ILA -121) was used, the line of = 514.5 nm and power not greater than 50 mW in order to avoid overheating of the sample during measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Then both, the system viscosity as well as interactions between monomer molecules and segments are expected to have an important influence on Brillouin scattering spectrum of the system. Thus, Brillouin scattering can be useful method to study the intermolecular interactions and local structure of liquid monomers and polymers, since it reflects the cooperative motion among different segments and molecules [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%