Abstract
Abstract Liquid crystalline side-chain polymers (3b-3f) crosslinked by a trans Pt(II) complex were synthesized by a ligand exchange reaction with dichlorobis(benzonitrile)platinum(II) and poly(methylsiloxane) (3a) bearing a p-cyanobiphenyloxy mesogen unit attached to the polymer backbone by a flexible spacer group. The amount (x) of p-cyanobiphenyloxy mesogen coordinating to the Pt(II) ion in polymers 3b, 3c, 3d, 3e, and 3f was 4.9, 9.7, 14.8, 20.2, and 49.6 mol%, respectively. The effect of Pt(II) coordination on the thermotropic liquid crystalline behavior of 3a was examined by DSC, x-ray diffraction, and polarizing microphotography. Polymers 3a-3d exhibited a nematic mesophase between Tg and Tc. On the other hand, 3e-3f, which have a large amount of Pt(II)-coordinating mesogen, did not show a definite nematic mesophase, but exhibited an ambiguous one. The introduction of Pt(II) ion into 3a resulted in a crosslinked structure and consequently prevented the formation of the ordered nematic mesophase.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Macromolecular Science: Part A - Chemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
