Synthesis and characterization of liquid crystalline copolymers with dual photochromic pendant groups

Po Chih Yang, Ming Zu Wu, Jui Hsiang Liu

研究成果: Article同行評審

20 引文 斯高帕斯(Scopus)

摘要

In order to study the photoreactivity and the optical properties of liquid crystalline copolymers with multiple photochromic groups, a series of novel liquid crystalline binary and ternary polyacrylates consisting of one (C{double bond, long}C or N{double bond, long}N) or dual (C{double bond, long}C and N{double bond, long}N) photochromic segments were synthesized and characterized considering their liquid crystalline, optical, and photochromic properties and their thermal stability. Achiral homopolymer P1 shows a smectic A phase (fan-shaped texture), and all chiral copolymers CP1-CP6 exhibit chiral nematic phases (cholesteric, oily streaks textures). The polymers show excellent solubility in common organic solvents such as chloroform, toluene, and THF. These polymers also exhibit good thermal stability, with decomposition temperatures (Tds) greater than 373 °C at 5% weight loss, and beyond 440 °C at 50% weight loss under nitrogen atmosphere. UV irradiation caused E/Z photoisomerization at N{double bond, long}N and C{double bond, long}C segments of the synthesized photochromic copolymers leading to reversible and irreversible isomerizations, respectively. The synthesized liquid crystalline ternary copolymer CP6, containing two different photochromic N{double bond, long}N and C{double bond, long}C groups, is sensitive to different UV wavelengths and is notably interesting from the viewpoint of photochromic copolymers.

原文English
頁(從 - 到)2845-2856
頁數12
期刊polymer
49
發行號12
DOIs
出版狀態Published - 2008 六月 10

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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