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  • 1
    Online Resource
    Online Resource
    Liquid-Crystalline Polymers. (1990)
    Washington, DC :American Chemical Society,
    Details
    Keywords: Polymer liquid crystals-Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (525 pages)
    Edition: 1st ed.
    ISBN: 9780841212916
    Series Statement: ACS Symposium Series ; v.No. 435
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=5753657
    DDC: 668.9
    Language: English
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    GEOMAR EBL
  • 2
    Electronic Resource
    Electronic Resource
    Zigzag Morphology of a Poly(styrene-b-hexyl isocyanate) Rod-Coil Block Copolymer (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 1688-1697 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00109a048
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Studies of liquid-crystalline polymer phase transitions using synchrotron x-radiation (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 498-500 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00191a098
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Rigid-rod thermosets based on 1,3,5-triazine-linked aromatic ester segments (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 2947-2954 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00037a025
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Liquid crystalline polyesters by staged-addition polycondensation (1988)
    Springer
    Polymer bulletin 20 (1988), S. 45-51 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of model liquid crystalline (LC) polyesters have been prepared by low temperature solution polycondensation using staged addition methods. The model thermotropic polyesters were composed of aliphatic spacers and mesogenic groups made from substituted terephthalic acid and methyl hydroquinone. Both the mesogenic groups and the spacers were placed in the main chain. Attractive properties of these polymers include solubility in many organic solvents such as THF and DMSO with softening temperatures below 150°C. Some of these polymers show no melting transitions, and depending on the terephthalate group substituent, either smectic or nematic phases are formed. Results from GPC analysis show good solubility of polymers in THF with Mw lower than 10,000 compared to polystyrene standards. The synthesis and characterization of these LC polyesters are reported here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262248
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Further remarks on falling coaxial cylinder with wide shear rate range (1978)
    Springer
    Rheologica acta 17 (1978), S. 312-313 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01535068
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Liquid crystal copolyethers with mixed mesogenic units and flexible spacers (1990)
    Springer
    Polymer bulletin 23 (1990), S. 535-542 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Liquid crystalline copolyethers were prepared from monomer pairs selected from biphenol (BP), dihydroxy-α-methylstilbene (DHMS), and 2,2′-dimethyl-4,4′-dihydroxyazoxybenzene (DMAz) which were copolymerized with either dibromononane or dibromodecane spacers by phase transfer catalysis. Nematic LC mesophases were observed for most copolymers, but some exhibited dual mesophases. Smectic to nematic transitions were found in polymers with intermediate ratios of DMAz and DHMS with the nonamethylene spacer. These polymers showed excellent solubility in THF and CHCl3. The longest mesophase range which consisted of two mesophases was found in a polymer composed of a 4:1 ratio of DHMS to BP and a nonane spacer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419974
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The mechanical and magnetic alignment of liquid crystalline epoxy thermosets (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1845-1853 
    Details
    ISSN: 0887-624X
    Keywords: liquid crystalline ; networks ; epoxy ; thermotropic ; thermoset ; smectic ; nematic ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The processing of a new series of liquid crystalline (LC) epoxy networks was evaluated. Above the glass transition temperature, the low crosslink density networks could be mechanically aligned. The mechanically oriented networks readily lost orientation upon heating. Highly anisotropic liquid crystalline (LC) epoxy networks were also prepared by aligning the mesophase of the prepolymer during the curing process under the influence of a magnetic field. Orientation parameters (f) of 0.13 to 0.57 were achieved by these processes as determined by x-ray diffraction analysis. The ability of the magnetically aligned networks to retain their orientation above the glass transition temperature was determined by time-resolved x-ray diffraction. The stability of the alignment of these networks was found to depend on crosslink density. The effect of the anisotropy of these networks was investigated by measuring the coefficient of thermal expansion (CTE). In the aligned networks, there was a substantial reduction in CTE parallel to the direction of the applied field compared to the randomly oriented networks. © 1992 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300907
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  • 9
    Electronic Resource
    Electronic Resource
    New liquid crystal polyethers and polyesters based on diphenylbutadiene mesogens (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2541-2547 
    Details
    ISSN: 0887-624X
    Keywords: nonlinear optics ; liquid crystal ; polymers ; photocrosslinking ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New liquid-crystalline (LC) polymers and small molecules have been synthesized based on the 1,4-diphenylbutadiene mesogen, a chromophore with χ(3) nonlinear optical properties. Polyethers were formed by phase-transfer reaction, and polyesters were prepared by Schotten-Bauman polymerization from these 4,4'-bisphenolic mesogenic structures. Liquid crystallinity was examined using differential scanning calorimetry (DSC) and optical microscopy. Most of the model compounds were found to be nematic. All mesomorphic polymers were nematic and displayed LC ranges of up to 50°C as well as a wide diversity of melting points. The melting points varied with the flexible (methylene) spacer length and were strongly dependent upon the presence of substituents in the mesogenic core. Crosslinking and cis-trans isomerization were observed under the influence of heat and ultraviolet radiation. © 1992 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080301208
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  • 10
    Electronic Resource
    Electronic Resource
    Liquid crystalline epoxy thermosets based on dihydroxymethylstilbene: Synthesis and characterization (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1831-1843 
    Details
    ISSN: 0887-624X
    Keywords: liquid crystalline ; networks ; epoxy ; thermotropic ; thermoset ; smectic ; nematic ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This article describes the synthesis and characterization of a new series of liquid crystalline thermosets. Nematic epoxy-terminated oligoethers based on dihydroxy-α-methylstilbene were synthesized for this study. These prepolymers were crosslinked within the nematic mesophase using methylenedianiline. Depending upon the molecular weight and polydispersity of the oligoether, the crosslinking reaction resulted in networks with either a smectic or nematic molecular organization in contrast to the simple nematic phase of the oligoether. The formation of a smectic-like structure on curing was found to be related to the breadth of the prepolymer molecular weight. In those networks with a low crosslink density a clearing transition could be observed, whereas in the more highly crosslinked networks the molecular organization was frozen in until decomposition. The glass transition temperature of these LC networks rose as the crosslink density was increased, ranging from 35 to 152°C. In agreement with theory, the clearing transition of the networks was found to be dependent on the phase state during curing © 1992 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300906
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