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  • 1
    Electronic Resource
    Electronic Resource
    Spin labels as molecular rulers. Conformational analysis of a model system. 1,4-Didoxylcyclohexane oriented in a crystalline host (1974)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 96 (1974), S. 5311-5318 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00824a003
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the polymerization of crystalline 1,4-diethynylnaphthalene, 2Part 1: cf.6, preceding publication. The reaction mechanism (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2013-2029 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Crystalline 1,4-diethynylnaphthalene (1) is photochemically polymerized in the solid state by a radical mechanism. Only the chain initiation step is induced by light, whereas chain propagation also occurs in the dark. The polymerization is controlled by diffusion processes within partially melted domains of the crystal, ultimately leading to a completely disordered system. The reaction rate, however, also depends on the packing of the monomer in the crystal lattice and - in the beginning of the reaction - the polymer chains have a preferential orientation with regard to the crystal axes of the monomer. Radical polymerization in solution indicates that - due to the lack of effective chain termination steps - 1 can be polymerized rather effectively as compared to other acetylenes. The photochemically induced polymerization is approximately of second order with regard to monomer concentration.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790814
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  • 3
    Electronic Resource
    Electronic Resource
    On the polymerization of crystalline 1,4-diethynylnaphthalene, 1 the structure of the photopolymer (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1999-2011 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Upon irradiation with UV light crystalline 1,4-diethynylnaphthalene (1) readily polymerizes in the solid state. The purple polymer formed has a polyene polymer backbone and a molecular weight of 9000. Only one ethynyl group of the monomer participates in the polymerization process, whereas the second ethynyl group remains unreacted. The structure of the photopolymer was proven by spectroscopic methods, and direct evidence was obtained from resonant Raman spectra by comparing the photopolymer of the title compound to poly(1-ethynylnaphthalene) prepared by complex catalysis.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790813
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Novel auto-photosensitive polyimides with tailored properties (1992)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 1623-1629 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An overview is given on auto-photosensitive polyimides as introduced for the first time in 1985. It is shown how development proceeded and how the chemical basis of auto-photosensitive polyimides was extended beyond BTDA. Novel “photosensitizer tetracarboxylic dianhydrides” like 2,3,6,7-thioxanthonetetracarboxylic dianhydride (TXDA) were synthesized and copolymerized into preimidized nonphotoactive polyimides containing tetracarboxylic acids like 6FDA or ODPA. Novel photosensitive polyimides were obtained that carry all essential features of BTDA based systems plus higher photospeed. They provide the ability to better tailor material properties to specific applications.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760322115
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    Paper (German National Licenses)
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