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Photo- and thermoinduced ring opening reaction of 2[(1,3,3-trimethylindoline-2(1H)-yliden)propen-1-yl]-3,3-dimethylindolino[1,2-b]-oxazolidine in polymer films

100%

Petkov I., Charra F., Nunzi J., Deligeorgiev T.

Open Chemistry

2004

vol. 2

issue 2

290-301

The influence of UV light and temperature on poly(methylmethacrylate) (PMMA) and poly(vinylchloride) (PVC) films, doped with 2[(1,3,3-trimethylindoline-2(1H)-yliden)propen-1-yl]-3,3-dimethylindolino[1,2-b]-oxazolidine has been investigated. The radiation-induced colour was analyzed spectrophotometrically at the maximum of the absorption peak at 560 nm. The effect of the temperature on unirradiated and irradiated films was studied. The results demonstrate a strong photochromic and a weak thermochromic behaviour of the PMMA and PVC films. The relationship of photocolouration-thermal decolouration is discussed based on the spectral results reported here.

KINETICS OF ACTIVE SUBSTANCE RELEASE FROM FLAT BIOPOLYMER MULTILAYER FILMS

88%

Michalak I., Traczyk D., Mucha M.

Progress on Chemistry and Application of Chitin and its Derivatives

2010

vol. 15

107 - 116

Abstract. Polymer films were made of different biodegradable materials. Solid support of model active substance (salicylic acid) was unmodified and modified (crosslinked with glutaraldehyde) chitosan and outside layers were polylactid acid (PLA). The aim of the study was to obtain the controlled release kinetics of active substance, in medium of pH 5.6 which is similar to conditions occurring on the human skin surface. The chitosan films were investigated with swelling kinetics while multilayer films were studied with release kinetics of active substance (salicylic acid). The amount of salicylic acid released from film was measured using a UV-VIS spectrophotometer. The appropriate mathematical model was also adjusted to the experimental points. The results prove that the swelling process follows the first order kinetics but the results of release process are fitted with Peppas model.

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1 Open Chemistry

1 Progress on Chemistry and Application of Chitin and its Derivatives

1 2010

1 2004

1 Charra F.

1 Deligeorgiev T.

1 Michalak I.

1 Mucha M.

1 Nunzi J.

1 Petkov I.

1 Traczyk D.

Search results

Photo- and thermoinduced ring opening reaction of 2[(1,3,3-trimethylindoline-2(1H)-yliden)propen-1-yl]-3,3-dimethylindolino[1,2-b]-oxazolidine in polymer films

KINETICS OF ACTIVE SUBSTANCE RELEASE FROM FLAT BIOPOLYMER MULTILAYER FILMS