1988
DOI: 10.1007/bf01410277
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Thermochromism of poly-1-butene gels

Abstract: Poly-l-butene gels in some solvents of benzene-derivatives show a colouring phenomenon. The colour changes from blue to yellow under irradiation of natural light as the temperature rises from the melting point of the solvent to the sol-gel transition temperature. The colouring phenomenon is due to selective scattering, but not to optical absorption. The apparent characteristics of the phenomenon resemble the thermochromism of cholesteric liquid crystals, although poly-l-butene itself is colourless and has no a… Show more

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Cited by 9 publications
(7 citation statements)
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“…Above ca. 40 "C, R , is seen to increase with temperature and concentration. In the C12E, system, the increase of R, with temperature or concentration is more pronounced than in the C12E, system (see fig.…”
Section: Resultsmentioning
confidence: 87%
See 1 more Smart Citation
“…Above ca. 40 "C, R , is seen to increase with temperature and concentration. In the C12E, system, the increase of R, with temperature or concentration is more pronounced than in the C12E, system (see fig.…”
Section: Resultsmentioning
confidence: 87%
“…1, R, of C,,E, is essentially independent of concentration and temperature below ca. 40 "C. The limiting value for R , as c + 0 (c = concentration in g dm-3) is ca. 3.1 nm at 25 "C, which is in good agreement with the results of Nilsson et ~1 .…”
Section: Resultsmentioning
confidence: 99%
“…When the temperature and/or the concentration is increased, a transition from monodisperse spherical aggregates to elongated polydisperse cylindrical aggregates is observed. When hydrophilic units are added to the surfactant monomer, the region containing spherical micelles in the phase diagram expands. After the temperature is increased, a demixing occurs, and the homogeneous solution of spherical micelles separates into two isotropic phases, one rich and one poor in surfactants. ,, As before, the homogeneous isotropic phase enlarges its domain in the phase diagram when increasing the number of hydrophilic units per chain. Also, at intermediate and large surfactant concentration, the increase of the length of the hydrophilic moiety reduces the extent of the liquid crystal phases. …”
Section: Introductionmentioning
confidence: 96%
“…This coloring phenomenon has been considered to be due to selective light-scattering, as the transmitted-light spectra of the gels forms a rough reflected image of the scatteredlight spectra, which are measured in the direction perpendicular to the incident light. 1,2 We have more recently demonstrated that the development of coloration in polypropylene gels can be explained due to selective light-scattering on the basis of differences in the lightdispersive power between solvent and polypropylene, and to size-controlled polypropylene networks formed in the gel. [3][4][5][6][7][8][9][10][11] Furthermore, it has been experimentally proved that the thermochromic phenomenon in the gel can be explained consistently using the same logic.…”
mentioning
confidence: 99%