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Digitale Medien

Cyanated liquid crystals with trans-stilbene structure: Syntheses and their cyclotrimerizations (1995)

Ou, Jiunn-Chih ; Hong, Yen-Long ; Yen, Fu-Shan ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 313-321

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ISSN: 0887-624X

Schlagwort(e): liquid crystals ; cyanate ; cyclotrimerization ; liquid crystalline thermoset ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Liquid crystalline aromatic monocyanate (M) and dicyanates (D1 and D2) with trans-stilbene (—Ph—CH=CH—Ph—) structure were synthesized and their cyclotrimerization reactions were studied by differential scanning calorimetry and infrared spectroscopy. Monocyanate M underwent cyclotrimerization to yield a trimerized material with discotic properties. Dicyanate D2 and its cured product failed to exhibit any mesophase. In contrast, polycyclotrimerization of dicyanate D1 obtained a liquid crystalline thermoset with its schlieren texture prolonged over a wide temperature range. © 1995 John Wiley & Sons, Inc.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1995.080330213

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2

Digitale Medien

Cure kinetics of a flexible aromatic dicyanate with schiff base structure (1995)

Wang, Ying-Hung ; Hong, Yeng-Long ; Hong, Jin-Long

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 58 (1995), S. 1585-1592

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Polycyclotrimerization of a flexible aromatic dicyanate with a Schiff base structure was studied by means of differential scanning calorimetry (DSC). The study on dynamic DSC evaluated an apparent activation energy (Ea) of 75.8 kJ/mol and autocatalytic first-order kinetics with rate expression Af(α) = 1.96 X 105 (1 + 4.39 α) (1 - α) min-1. The kinetic feature can be explained by a proposed mechanism consisting of hydroxyl-catalyzed and autocatalytic paths. The lower value of Ea compared with other aromatic dicyanates is due to the electron-withdrawing linkage of the inherent imine ( - CH=N) structure. The kinetic feature is affected by the content of the residual impurities (e.g., phenols or absorbed water) in the corresponding sample. © 1995 John Wiley & Sons, Inc.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1995.070580922

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Digitale Medien

Antioxidant synergism and mutual protection of α-tocopherol and β-carotene in the inhibition of radical-initiated peroxidation of linoleic acid in solution (1995)

Li, Zhao-Long ; Wu, Long-Min ; Ma, Lan-Ping ; [weitere]

Chichester : Wiley-Blackwell

Journal of Physical Organic Chemistry 8 (1995), S. 774-780

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ISSN: 0894-3230

Schlagwort(e): Organic Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Peroxidation of linoleic acid was initiated by azobis(isobutyronitrile) in tert-butyl alcohol and inhibited by α-tocopherol, β-carotene and retinal, either alone or in combination. Significant antioxidant synergism and a novel mutual protection of α-tocopherol and β-carotene were found and the possible involvement of retinal in the process is discussed.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/poc.610081203

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