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  • Artikel: DFG Deutsche Nationallizenzen  (3)
  • Photogenerated acid  (2)
  • Molecular alignment  (1)
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  • Artikel: DFG Deutsche Nationallizenzen  (3)
Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Reversible alignment change of nematic liquid crystals by photochromic polymer films (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 311-318 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Liquid crystal (LC) ; Photoresponsive polymer ; Photochromic reaction ; Molecular alignment ; Photorecording ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: The alignment of a nematic liquid crystal (LC) was changed reversibly by a photochromic reaction of vinyl-polymer films bearing azobenzene (Az) chromophores. Photoisomerization of Az in the polymer films proceeded slower than in solution systems with an irreversible nature, due to a limited free volume of polymers and the presence of Az aggregates. Photoregulative Az films were obtained by two procedures: (i) spin-coating followed by baking processes: and (ii) adsorption from a LC/polymer mixture onto a lecithin-coated glass surface. Perpendicular alignment, which is achieved both in the surface Az and in the LC layer, allows a parallel interaction between them and enables the photoregulation of the LC alignment.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1990.220010505
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Positive working photoresists sensitive to visible light, II: poly{2-arylpropyl-2 and bis(p-methoxyphenyl)methyl methacrylates} (1992)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 3 (1992), S. 61-65 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Iodonium salt ; Photogenerated acid ; Photoresist ; Poly(methacrylates) ; Diffraction efficiency ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Acid-labile polymers of methacrylates of 2-(p-substituted phenyl)propanol-2 and bis(p-methoxyphenyl)methanol were evaluated as visible light sensitive positive-type resists. The chemistry to form images is based on the cleavage of esters catalysed by an acid generated by photodecomposition of diphenyliodonium hexafluorophosphate sensitized by 2-benzoyl-3-(p-dimethylaminophenyl)-2-propenenitrile. A copolymer of bis(p-methoxyphenyl)methyl methacrylate-phenyl methacrylate exhibited a high photospeed upon exposure to 488 nm light when coupled with the iodonium salt and the dye, and was applicable to relief holography.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1992.220030203
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    Positive working resists sensitive to visible light, I: poly(tert-butyl and 2-phenylpropyl-2 methacrylates) sensitized with diphenyliodonium salt  -  p-aminobenzylidene dye system (1992)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 3 (1992), S. 9-16 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Iodonium salt ; Sensitized photolysis ; Photogenerated acid ; Poly(methacrylates) ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Visible-light-sensitive positive type resists have been developed. The chemistry to form images is based on the cleavage of side chain ester bonds of poly(methacrylates) catalyzed by an acid which is generated on sensitized photodecomposition of a diphenyliodonium (DPI) salt. Homopolymers and copolymers of tert-butyl methacrylate (BMA) and 2-phenylpropyl-2 methacrylate (PPMA) were used as acid labile polymers. Exposure of thin films of the poly(methacrylates) containing DPI salt and p-dimethylaminobenzylidene derivatives to an Ar laser beam emitting 488 nm light and subsequent heat treatment resulted in solubility alteration of the polymers, which became soluble in a protic solvent system. Considerable reduction of film thickness was observed after heating an image-wise exposed thin film of PPMA polymers. The minimum exposure energies of 488 nm light for the positive image formation were 60 mJ/cm2 and 40 mJ/cm2 for BMA and PPMA homopolymers, respectively.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1992.220030102
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