Cholesteric Mesophases Formed by the Modified Biological Macromolecule 3,6-O-(Butyl Carbamate)-N-phthaloyl Chitosan
| العنوان: | Cholesteric Mesophases Formed by the Modified Biological Macromolecule 3,6-O-(Butyl Carbamate)-N-phthaloyl Chitosan |
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| المؤلفون: | Shikha P. Barman, Deeleep K. Rout, Richard A. Gross, Satish K. Pulapura |
| المصدر: | Macromolecules. 27:2945-2950 |
| بيانات النشر: | American Chemical Society (ACS), 1994. |
| سنة النشر: | 1994 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Polymers and Plastics, Stereochemistry, Organic Chemistry, Biological macromolecule, Polymer, Dichroic glass, Inorganic Chemistry, Chitosan, chemistry.chemical_compound, Crystallography, chemistry, Liquid crystal, Materials Chemistry, Spectroscopy, Mass fraction, Visible spectrum |
| الوصف: | Cholesteric liquid crystalline phases were observed in DMSO solutions of a new chitosan derivative. This chitosan derivative had a substitution pattern which approximates that of 3,6-O-(butyl carbamate)-N-phthaloyl chitosan (BuCaPhCh). UV-visible and circular dichroic (CD) spectroscopy carried out on BuCaPhCh revealed that the cholesteric pitch is in the visible wavelength (λ) region and is left-handed for all investigated polymer weight fraction, x, values (0.50, 0.56, 0.60, and 0.70) and solution temperatures (25-88°C). The apparent absorption minima, λ a , due to selective reflection of the cholesteric phases, showed a very strong variation as x was decreased to a value near the isotropic-anisotropic solution liquid crystal transition |
| تدمد: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00089a009 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::528ee8f1944a8c6da63eddff842e8280 https://doi.org/10.1021/ma00089a009 |
| رقم الانضمام: | edsair.doi...........528ee8f1944a8c6da63eddff842e8280 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15205835 00249297 |
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| DOI: | 10.1021/ma00089a009 |