𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Synthesis of new smectic C* liquid-crystalline block copolymers

✍ Scribed by Wen Yue Zheng; Paula T. Hammond

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
707 KB
Volume
17
Category
Article
ISSN
1022-1336

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A series of smectic C^*^ liquid‐crystalline (LC) block copolymers were successfully synthesized via the living anionic polymerization of polystyrene with optically active methacrylate monomers containing (S)‐2‐methylbutyl 4‐(4‐hydroxyphenylcarbonyloxy)‐biphenyl‐4′‐carboxylate mesogens. These materials are the first reported smectic C^*^ block copolymers. Anionic polymerization in tetrahydrofuran (THF) at −70°C leads to LC block molecular weights of approximately twenty repeating units. The number‐average molecular weight of the polystyrene block was varied from 7000 to 20000 to adjust the composition in the block copolymers. Differential scanning calorimetry and optical microscopy indicate that the smectic C^*^ phase is present in the systems over broad temperature ranges.

📜 SIMILAR VOLUMES

Synthesis of block and graft copolymers
Synthesis of block and graft copolymers containing liquid-crystalline segments
✍ Gomes, Ailton S; Barbosa, Celton A; Pinto, Mauricio R 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 157 KB 👁 2 views

Block and graft copolymers bearing amorphous or semi-crystalline and liquid-crystalline moieties were obtained by means of non-traditional synthetic routes. Chemical modi®cation of block and graft copolymer precursors by molecular liquid crystals and controlled radical block copolymerization between

Phase and thermal behavior of liquid-cry
Phase and thermal behavior of liquid-crystalline block copolymers
✍ Dietmar Wolff; Dino Ferri; Jürgen Springer; Oriano Francescangeli; Michele Laus; 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 842 KB

The phase behavior of liquid+ rystalline (LC) block copolymers containing mesomorphic blocks with mainchain (MC) units and side-group (SG) substituents was investigated. The MC block consisted of an LC semiflexible polyester and the SG block was an LC polymethacrylate. Four different samples were pr