Optical anisotropy of a photoreacted side-chain liquid-crystalline polymer induced by linearly polarized UV light

✍ Scribed by Nobuhiro Kawatsuki; Hirohumi Takatsuka; Tohei Yamamoto; Osamu Sangen

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 172 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19980730)36:10<1521::aid-pola5>3.0.co;2-t

✦ Synopsis

Linearly polarized (LP) UV photoreaction of a photo-crosslinkable sidechain liquid-crystalline polymer (SLCP) containing photoreactive cinnamoyl and biphenyl mesogenic groups ( 1) was studied. The optical anisotropy of the polymer film was induced by the LP-UV photoreaction and was investigated by the temperature-controlled polarized UV absorption spectroscopy and polarized FT-IR measurements. The reorientation of the nonreacted mesogenic groups along to the E ˆdirection of the incident LP-UV light during the photoreaction occurred at the LC temperature range of the polymer, and the induced birefringence Dn was about 0.02. Because of the high-density photo-crosslinking, the LP-UV photoreacted film showed orientational stability up to 160ЊC.