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  • 1
    Electronic Resource
    Electronic Resource
    Optically-active comb-branch liquid crystalline polymers having the chiral center in the flexible spacer unit. III. Copolymers of (S)-2-(4′-cyano-4-biphenylyloxy)-1-methylethoxy ethyl methacrylate and di[6-(4-methoxy-4′-oxybiphenyl) hexyl]-2-methylene butane-1,4-dioate (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1179-1185 
    Details
    ISSN: 0887-624X
    Keywords: comb-branch liquid crystal ; chiral nematic polymer ; liquid crystal copolymers ; selective reflection colors ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new series of copolymers with optically-active liquid crystalline side chain units has been synthesized from the comonomers (S)-2-[2-(4′-cyano-4-biphenylyloxy-1-methylethoxy]ethyl methacrylate (1) and di[6-(4-methoxy-4′-oxybiphenyl)hexyl]-2-methylene butane-1,4-dioate (4). Chiral nematic phases were exhibited by two members of the series, rich in monomer 1, while a smectic phase was exhibited in copolymers rich in 4. While it was thought possible that ordered chiral liquid crystalline phases may be induced by copolymerizing chiral mesogenic monomers with mesogenic derivatives of itaconic acid where the high side chain density encourages greater ordering in the system, no evidence of smectic C* phases could be found in the present systems. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310513
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Wet development of polymer resists: A guide to solvent selection (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 4 (1994), S. 155-163 
    Details
    ISSN: 1057-9257
    Keywords: Wet development ; θ-Solvents ; Cosolvents ; Rate of dissolution ; Polymer resists ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The criteria for selecting effective solvent systems for wet development of polymer resist materials are explored. Methods of estimating the polymer-solvent interactions are described, including the use of solubility parameters and the Flory-huggins interaction parameter. Methods of achieving θ-conditions, which represent minimal solvent-precipitant mixtures, or the more novel approach of establishing cosolvent systems are described. The rate dissolution has also bee identified as a controlling parameter. Some optical and gravimetric methods for measuring dissolution rates for polymer films are outlined. Examples of the influence of these factors on the sensitivity and contrast of resists such as poly(methylmethacrylate) and poly(p-methyl styrene-stat-chloromethyl styrene) are described.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860040209
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    Paper (German National Licenses)
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