✦ LIBER ✦

Photo-induced phase transition of side chain liquid crystalline copolymers with photochromic group

✍ Scribed by Takanori Hayashi; Hirofumi Kawakami; Yasuo Doke; Akira Tsuchida; Yoshihiko Onogi; Masahide Yamamoto

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 537 KB
Volume: 31
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(94)00134-0

No coin nor oath required. For personal study only.

✦ Synopsis

Liquid crystalline copolymers containing 4'-cyanobiphenyl-4-oxyundecylacrylate (CBO-1 I-A) groups and phenylazophenyloxy-undecylacrylate (ABO-I I-A) groups with various proportions were synthesized. The copolymers take a highly liquid crystalline state but the temperature range of liquid crystalline state was narrowed with increasing azobenzene content. Isothermal phase transition of copolymers was induced by the photoisomerization of the azobenzene moiety with irradiation of 365 nm light. The response time of this phase transition was measured using an excimer pulse laser (351 nm). It took from a fi:w ms to several hundred ms at 70-80°C to cause a phase transition in these liquid crystalline systems.

📜 SIMILAR VOLUMES

Phase and orientational behaviors in liq

Phase and orientational behaviors in liquid crystalline main-chain/side-group block copolymers

✍ Dino Ferri; Dietmar Wolff; Jürgen Springer; Oriano Francescangeli; Michele Laus; 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 260 KB 👁 2 views

The phase and orientational behaviors of a series of liquid crystalline (LC) AB-type diblock copolymers comprising thermotropic main-chain (MC) polyester and side-group (SG) polymethacrylate blocks were investigated by X-ray diffraction. The MC and SG blocks were phase separated and gave rise to the

Phase transitions of side-group liquid c

Phase transitions of side-group liquid crystalline polymers with a metastable SA phase

✍ Frank Thomas Niesel; Jürgen Springer; Sylvia Czapla; Dietmar Wolff; Joachim Rübn 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 468 KB

Molecular weight effects on phase transi

Molecular weight effects on phase transitions of side-chain liquid crystalline poly(vinyl ether)s with terminal alkoxybiphenyl groups

✍ Toshihiro Sagane; Robert W. Lenz 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 863 KB

Liquid crystalline side group polyesters

Liquid crystalline side group polyesters with a systematic variation of main chain and side group spacer length

✍ Axel Böhme; Siegmar Diele; Jürgen Lindau 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 87 KB 👁 2 views

To investigate the influence of a systematic variation of the length of main chain and side group spacers on the thermal phase behaviour four homologous series of liquid crystalline side group polyesters with 4-(phenylazo)azobenzene moieties as mesogenic side groups have been prepared and characteri

Side-chain functionalized liquid crystal

Side-chain functionalized liquid crystalline polymers and blends, 4. Phase behavior of functionalized liquid crystalline copolymers containing maleic acid fragments

✍ Evgueni Barmatov; Marina Barmatova; Friedrich Kremer; Valery Shibaev 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 79 KB 👁 2 views

Dipolar relaxations in the glass transit

Dipolar relaxations in the glass transition region and in the liquid crystalline phase of two side-chain liquid crystalline polysiloxanes

✍ Joaquim J. Moura Ramos; João F. Mano; David Lacey; G. Nestor 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 769 KB

The molecular relaxation mechanisms in the glass transition region and in the liquid crystalline phase exhibited by two side-chain liquid crystalline polysiloxanes have been studied by Thermally Stimulated Discharge Currents. These results were compared with those previously obtained by dielectric r