Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Heat Treatment and Additives on the Photochromic and Mechanical Properties of Sol-Gel Derived Photochromic Coatings Containing Spirooxazine (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 923-926 
    Details
    ISSN: 1573-4846
    Keywords: photochromism ; photochromic coatings ; spirooxazine ; photochromic properties ; mechanical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The experimental results on the photochromic and mechanical properties of coatings containing 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-(3H)-naphth(2,1-b)(1,4) oxazine] (SO) derived from 3-glycidyloxypropyltrimethoxysilane (GPTMS), bisphenol A (BPA) and 1-methylimidazole (MI) by sol-gel processing are presented. It is shown that heat treatment temperature is a conflicting factor to the photochromic intensity (Δ A 0), photostability and abrasion resistance of the photochromic coatings. With increasing densification temperature the matrix rigidity increases leading to a decrease of Δ A 0 and at the same time an enhancement of both abrasion resistance and photostability, the optimum heat treatment temperature is 110°C under our experimental conditions. By the use of certain additives, e.g., fluorosilanes (FAS), not only Δ A 0 but also the photostability and the abrasion resistance of the photochromic coatings have been further improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018384913360
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Enhancement of the Photochromic Performance of Spirooxazine in Sol-Gel Derived Organic-Inorganic Hybrid Matrices by Additives (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 927-929 
    Details
    ISSN: 1573-4846
    Keywords: organic-inorganic hybrids ; sol-gel ; photochromic performance ; spirooxazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Organic-inorganic hybrid materials synthesized via sol-gel processing are excellent solid matrices for photochromic dyes like spirooxazine, and the photochromic performance can be further enhanced by introducing suitable additives. This work describes the effects of additives on the photochromic intensity (Δ A 0), decolouration rate (k) and photostability of spirooxazine in sol-gel derived organic-inorganic hybrid matrices. They include fluoro-alkylsilane (FAS), bisphenol A (BPA) and methyl-imidazole (MI). FAS enhances both Δ A 0 and photostability, but has little effect on k. The higher the content of BPA, the higher the Δ A 0 and the higher the photostability, but the lower the k. The effect of MI on Δ A 0 and k is not so considerable as that of BPA and is a little complicated, while significant improvement in photostability is achieved by the addition of MI at an optimum concentration with the presence of BPA at a higher content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018337030198
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effect of heat treatment and additives on the photochromic and mechanical properties of sol-gel derived photochromic coatings containing spirooxazine (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 923-926 
    Details
    ISSN: 1573-4846
    Keywords: photochromism ; photochromic coatings ; spirooxazine ; photochromic properties ; mechanical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The experimental results on the photochromic and mechanical properties of coatings containing 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-(3H)-naphth(2,1-b)(1,4) oxazine] (SO) derived from 3-glycidyl-oxypropyltrimethoxysilane (GPTMS), bisphenolA (BPA) and 1-methylimidazole (MI) by sol-gel processing are presented. It is shown that heat treatment temperature is a conflicting factor to the photochromic intensity (ΔA 0), photostability and abrasion resistance of the photochromic coatings. With increasing densification temperature the matrix rigidity increases leading to a decrease of ΔA 0 and at the same time an enhancement of both abrasion resistance and photostability, the optimum heat treatment temperature is 110°C under our experimental conditions. By the use of certain additives, e.g., fluorosilanes (FAS), not only ΔA 0 but also the photostability and the abrasion resistance of the photochromic coatings have been further improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436961
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Enhancement of the photochromic performance of spirooxazine in sol-gel derived organic-inorganic hybrid matrices by additives (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 927-929 
    Details
    ISSN: 1573-4846
    Keywords: organic-inorganic hybrids ; sol-gel ; photochromic performance ; spirooxazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Organic-inorganic hybrid materials synthesized via sol-gel processing are excellent solid matrices for photochromic dyes like spirooxazine, and the photochromic performance can be further enhanced by introducing suitable additives. This work describes the effects of additives on the photochromic intensity (ΔA 0), decolouration rate (k) and photostability of spirooxazine in sol-gel derived organic-inorganic hybrid matrices. They include fluoroalkylsilane (FAS), bisphenolA (BPA) and methyl-imidazole (MI). FAS enhances both ΔA 0 and photostability, but has little effect onk. The higher the content of BPA, the higher the ΔA 0 and the higher the photostability, but the lower thek. The effect of MI on ΔA 0 andk is not so considerable as that of BPA and is a little complicated, while significant improvement in photostability is achieved by the addition of MI at an optimum concentration with the presence of BPA at a higher content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436962
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Polymetalates based organic-inorganic nanocomposites (1994)
    Springer
    Journal of sol gel science and technology 3 (1994), S. 189-197 
    Details
    ISSN: 1573-4846
    Keywords: nanocomposites ; sol-gel ; heteropolymetalates ; photochromics ; electrochemical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New nanocomposites materials have been synthesized. They present electrochemical and photochromic properties. They are based on a hybrid organic-inorganic network, in which tungsten heteropolyoxometalates (PW12O 40 3− , SiW12O 40 4− , W10O 32 4− , polymeric tungstate) are entrapped. High tungsten ratios could be reached and films or bulk materials have been obtained. The structure of these materials is described on the basis of multi-spectroscopic investigations (IR, EPR, NMR). Electrochemical redox reactions have been observed in thin films. Dark blue reversible coloration of the materials is obtained under UV irradiation. The photochromic mechanism has been investigated and shows the reversible formation of carbonyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486557
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Desaktivierungsverhalten von Arenen und Heteroarenen. XXXVI. Zum Lösungsmittel- und Temperatureinfluß auf das Desaktivierungsverhalten von 9, 9′-Bis(acridizinium-yl) bei hohen Konzentrationen (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 225-231 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Deactivation Behaviour of Arenes and Heteroarenes. XXXVI. The Solvent and Temperature Dependence of Deactivation Behaviour of 9, 9′-Bis(acridizinium-yl) at High ConcentrationAt room temperature the geometrical structure of the fluoresceing singlet state of 9, 9′-bis(acridizinium-yl) is determined by the solvent. In solvents of the type A (water, methanol, acetonitril) a plain S1-state emits, in the case of the solvent type B (ethanol, propanol-(2)) the S1-state is twisted. Both excited states have different emission spectroscopical properties.At high concentration (c ≥ 10-4 mol l-1) in the case of the solvent type B a new emission band is observed, and the monomer emission is quenched. This new band is interpreted as a fluorescence from a molecular associate in the excited state. The intensity of this associate band is increasing with decreasing temperature. It is shown that this band is the result of molecular association in the ground state. From the photochemical irradiation it follows that only in the case of the solvent type B a photocycloaddition is possible. The plain S1-state does not react.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250207
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Massenspektroskopische Charakterisierung von ω-ChloralkylphenylphosphanenHerrn Prof. Dr. Siegfried Engels (Halle/S.) anläßlich seines 65. Geburtstages gewidmet (1997)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 482-484 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Mass Spectrometric Characterization of ω-Chloralkylphenylphosphines
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19973390187
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Einige Beobachtungen über die Viskosität von Lösungen des KURROLschen Salzes (KPO3)x in Abhängigkeit von den Herstellungsvoraussetzungen (1955)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 2 (1955), S. 196-202 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Viskosität von Lösungen des sogenannten KURROLschen Kaliumsalzes (KPO3)x ist nicht nur abhängig von den Herstellungsbedingungen, insbesondere der Temperaturführung, sowie vom genauen Molverhältnis K2O:P2O5 des Ausgangsmaterials und  -  hierdurch bedingt  -  vom Grad der Vernetzung der Polyphosphatketten, sondern auch von der Anwesenheit geringer Verunreinigungen. So läßt sich der höchstviskose Typ nur aus völlig arsenfreien Ausgangsprodukten darstellen. Arsen (V) wird in die Polyphosphatanionen eingebaut. Beim Behandeln mit Wasser hydrolysiert Arsen (V) momentan als Orthoarsenat heraus, wodurch Kettenbruch eintritt, und man erhält Lösungen von geringerer Viskosität, was schon merklich ist, wenn auf 106 Atome P 1 Atom Arsen kommt. Hieraus wird geschlossen, daß der durchschnittliche Kondensationsgrad der Polyphosphatanionen im höchstviskosen KURROLschen Kaliumsalz mindestens von der Größenordnung 106 sein muß.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19550020402
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Über makromolekulare Verbindungen. 241. Mitteilung. Über Polyester (1940)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 155 (1940), S. 129-162 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19401550601
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Elektrophile Additionen an ω-Methoxyolefine (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 956-968 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Addition verschiedener elektrophiler Agenzien an ω-Methoxyolefine wurde untersucht, um Aufschluß über eine Methoxygruppenbeteiligung zu erhalten. Eine derartige Beteiligung konnte bei der Addition von Chlor und Brom an 5-Methoxypenten-(1) nachgewiesen werden; hier entstehen zu 10-15% die entsprechenden 2-Halogenmethyltetrahydrofurane, und zu 50-60% tritt Umlagerung unter Verschiebung der Methoxygruppe ein. Die Addition von Chlor oder Brom an 6-Methoxyhexen-(1) liefert zu 15-20% die entsprechenden 2-Halogenmethyltetrahydropyrane, eine Methoxylgruppenwanderung ist nicht nachweisbar. Die Reaktion von Chlor oder Brom mit 4-Methoxybuten-(1) und mit 7-Methoxyhepten-(1) liefert ausschließlich 1, 2-Additionsprodukte.Bei der Anlagerung von Chlor an Allyl-methyl-äther erhält man außer 73% 2,3-Dichlor-1-methoxypropan infolge nebenher ablaufender Dreikomponentenreaktionen 12% 1,2,3-Trichlorpropan, 7% 1,3-Dimethoxy-2-chlorpropan und 8% 1, 2-Dimethoxy-3-chlorpropan. Bei der Addition von 2,4-Dinitrophenylsulfenylchlorid und von Quecksilberacetat an ω-Methoxyolefine tritt weder Umlagerung noch Ringschluß ein. Mit 2, 4-Dinitrophenylsulfenylchlorid entstehen nebeneinander Markownikow- und anti-Markownikow-Produkte, der Anteil des Markownikow-Produktes steigt mit wachsender Kettenlänge vom Allyl-methyl-äther bis zum 7-Methoxyhepten-(1).
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130523
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...