Self-diffusion in poly( N? -vinyl pyrrolidone) - poly(ethylene glycol) systems

2001 ◽  
Vol 279 (6) ◽  
pp. 532-538 ◽  
Author(s):  
R. S. Vartapetian ◽  
E. V. Khozina ◽  
J. K�rger ◽  
D. Geschke ◽  
F. Rittig ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Vinyl Pyrrolidone ◽  
Poly Ethylene Glycol ◽  
Self Diffusion ◽  
Poly Ethylene

scholarly journals One Step E-Beam Radiation Cross-Linking of Quaternary Hydrogels Dressings Based on Chitosan-Poly(Vinyl-Pyrrolidone)-Poly(ethylene Glycol)-Poly(Acrylic Acid)

2020 ◽  
Author(s):  
Ion Călina ◽  
Maria Demeter ◽  
Anca Scărișoreanu ◽  
Veronica Sătulu ◽  
Bogdana Mitu
Keyword(s):  
Acrylic Acid ◽  
Ethylene Glycol ◽  
Transmission Rate ◽  
Vinyl Pyrrolidone ◽  
Cross Linking ◽  
Poly Ethylene Glycol ◽  
Beam Radiation ◽  
Swelling Properties ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

We report on the successful preparation of wet dressings hydrogels based on Chitosan-Poly(N-Vinyl-Pyrrolidone)-Poly(ethylene glycol)-Poly(acrylic acid) and Poly(ethylene oxide) by e-beam cross-linking in weakly acidic media, to be used for rapid healing and pain release of infected skin wounds. The structure and compositions of hydrogels investigated according to sol-gel and swelling studies, network parameters, as well as FTIR and XPS analyses showed the efficient interaction of the hydrogel components upon irradiation, maintaining the bonding environment while the cross-linking degree increasing with the irradiation dose and the formation of a structure with the mesh size in the range 11-67 nm. Hydrogels with gel fraction above 85% and the best-swelling properties in different pH solutions were obtained for hydrogels produced with 15 kGy. The hydrogels are stable in the simulated physiological condition of an infected wound and show appropriate moisture retention capability and the water vapor transmission rate up to 272.67 g m-2 day-1, to ensure fast healing. The hydrogels proved to have a significant loading capacity of ibuprofen (IBU), being able to incorporate a therapeutic dose for the treatment of severe pains. Simultaneously, IBU was released up to 25% in the first 2h, having a release maximum after 8h.

Impact of Molecular Weight on Miscibility and Interdiffusion between Poly(N-vinyl pyrrolidone) and Poly(ethylene glycol)

2002 ◽  
Vol 203 (18) ◽  
pp. 2674-2685 ◽  
Author(s):  
Danir F. Bairamov ◽  
Anatoly E. Chalykh ◽  
Mikhail M. Feldstein ◽  
Ronald A. Siegel
Keyword(s):  
Molecular Weight ◽  
Ethylene Glycol ◽  
Vinyl Pyrrolidone ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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