Zeitschrift Für Physikalische Chemie

1974

DOI: 10.1515/zpch-1974-25510

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Isomorphiebeziehungen zwischen kristallin-flüssigen Phasen

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1982

1982

1997

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Cited by 3 publications

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Polymorphism in Thermotropic Liquid Crystals

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et al. 1983

Advances in Liquid Crystals

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Polymorphism in Thermotropic Liquid Crystals

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et al. 1983

Advances in Liquid Crystals

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Side-Chain Liquid-Crystalline Polysiloxanes via Anionic Polymerization: (n-Undecyloxy)arenecarboxylic Acid Mesogens Linked to Poly(dimethylsiloxane-co-methylvinylsiloxane)

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1997

Macromolecules

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A novel, anionic route to well-defined side-chain liquid-crystalline polysiloxanes is described. The usual cationic approach to these polymers leads to polydisperse materials with uncontrolled microstructures. Ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly-(dimethylsiloxane-co-methylvinylsiloxane) with a low polydispersity (M h w/M h n ) 1.16), a controlled molar mass, and a uniform distribution of pendant vinyl groups along the chain. Vinyl-containing mesogenic molecules could be attached to the polysiloxane vinyl groups in a two-step hydrosilylation reaction by means of the coupling agent 1,1,3,3-tetramethyldisiloxane, yielding polymers with regularly spaced side groups. The flexible disiloxane link increases the mobility of the mesogenic moieties. In this study, 4-(n-undecyloxy)benzoic acid and the novel side group 4′-(n-undecyloxy)-4-biphenylcarboxylic acid were used as mesogens. The thermal behavior of the side-chain liquid-crystalline polymers was investigated by means of differential scanning calorimetry and optical microscopy.

Thermal Properties of Binary Mixtures of Liquid Crystals. A Review

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et al. 1982

Molecular Crystals and Liquid Crystals

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