Polymers containing substituted 2-phenyl-benzoxazole side-chain groups: Synthesis and phase behavior

✍ Scribed by Roberto Centore; Barbara Panunzi; Antonio Roviello; Augusto Sirigu; Paola Villano

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 677 KB
• Volume: 34
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19961115)34:15<3203::aid-pola10>3.0.co;2-g

✦ Synopsis

The synthesis of substituted 2-phenyl-benzoxazoles has been accomplished by ring closure of Schiff bases. The compounds have been used as precursors of acrylic derivatives displaying LC properties: R, NO,, CN; R, = -OOC -pC6H4 -O(CH,)600CCH = CH,; R1 = -OOC-pCcjH4-O(CH2)6OOCCH=CHZ, -N(CH,)(CH,)6OOCCH=CH,; R, = NO, Four comb-like homopolymers have been obtained by radical catalysis from the acrylic monomers. The polymers have been characterized by 'H-NMR, DSC, x-ray diffraction, viscometry, and polarizing microscopy. Three of the polymers exhibit liquid crystalline properties of smectic type. 0