A hybrid-type, chiral pi-conjugated polymer wrapped with polyhedral oligomeric silsesquioxanes

作者：Miyake Junpei^*; Chujo Yoshiki

来源：Journal of Polymer Science Part A: Polymer Chemistry , 2008, 46(18): 6035-6040.

DOI：10.1002/pola.22914

• chiral
• conjugated polymers
• fluorescence
• nanocomposites
• poly-condensation

A novel hybrid-type chiral binaphthyl-based polyarylene derivative with polyhedral oligomeric silsesquioxanes (POSS) units 2a was prepared by Suzuki-Miyaura coupling polymerization from a chiral (R)-6,6'-dibromo-2,2'-diPOSS-substituted 1,1'-binaphthyl derivative la and p-biphenylene diboronic acid. As a reference, a binaphthyl-based polyarylene derivative without POSS unit 2b was also prepared. The obtained polymers were studied with thermogravimetric analysis, optical rotations, circular dichroism (CD), ultraviolet-visible, and photoluminescence (PL) spectra. Gel permeation chromatography measurements of 2a and 2b showed that their number-average molecular weights were 13,300 and 16,500, respectively, The thermal stability of POSS-modified polymer 2a (temperature of 10% weight loss; T-10 = 380 degrees C) was extremely high compared with that of polymer without POSS unit 2b (T10 = 335 degrees C) due to the siliceous bulky POSS segments on the side chains. The specific optical rotation [alpha](D) was -66.7 degrees (c 0.06, CHCl3) for 2a and -62.3 degrees (c 0.06, CHCl3) for 2b. The CD spectra showed that these two polymers had very similar and strong Cotton effects. Film polymer 2a showed almost the same PL spectrum as that in dilute CHCl3 solution, indicating that bulky POSS units strongly suppressed intermolecular aggregation of the pi-conjugated polymer backbone.

• 出版日期2008-9-15