Side-chain liquid crystalline copolymers with non-mesogenic comonomers – influence of comonomer content on the nature of the mesophase

✍ Scribed by Jörg Sänger; Wolfram Gronski

• Book ID: 102942498
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 677 KB
• Volume: 18
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.1997.030180109

✦ Synopsis

Abstract

Statistical copolymers with mesogenic and non‐mesogenic comonomer units were synthesized by partial hydroboration of the 1,2‐units of polybutadiene and subsequent conversion of the alcohol groups to mesogenic units. The nature of the LC phase proves to be dependent on the mesogen content. Below a certain content the smectic C phase vanishes, and the polymer becomes cypotactic nematic. T~g~, T~s,n~, T~n,i~ and Δ__H__~s,n~ depend on the mesogen content, whereas Δ__H__~n,i~ is independent. No difference can be detected between the phase behaviour of homopolymers and ABA‐triblock copolymers with a liquid crystalline B‐block and 10 wt.‐% polystyrene A‐blocks.