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Segmented liquid crystalline polyesters with allyl group as lateral substituent

✍ Scribed by Ugo Caruso; Pio Iannelli; Antonio Roviello; Augusto Sirigu

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
234 KB
Volume
36
Category
Article
ISSN
0887-6266

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✦ Synopsis

The synthesis and a partial characterization of segmented liquid crystalline polymers with 3,3Ј-diallyl-4,4Ј-dihydroxybiphenyl unit in the rigid moiety is reported. The general formula of polymers is

x , with n ϭ 6, 8, 10, 12, and R ϭ OCH 2 OCHACH 2 . All polymers have nematic liquid-crystalline behavior. At room temperature, annealed fiber samples of polymers show a complex polymorphism. Three phases have been isolated with very large unit cells accommodating 6 or 12 chains. The projection of the molecular packing in a plane perpendicular to the c axis is characterized by the organization of chains in a two-dimensional hexagonal or quasi-hexagonal array.

📜 SIMILAR VOLUMES

Supramolecular hexagonal structure of a
Supramolecular hexagonal structure of a segmented liquid crystalline polyester with allyl group as lateral substituent
✍ Domenico Acierno; Luciano Di Maio; Pio Iannelli 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 281 KB 👁 1 views

The molecular structure of the phase-stable at room temperature-for the polymer with formula ), space group P6 3 , six chains per unit cell (d calcd ϭ 1.23 g cm Ϫ3 ). The six chains are packed together to give a bundle with the center of mass set at the origin of the unit cell. The allyl groups are