Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Provisional)

Abstract

Three types of bi-functionalized copolymers (P1FAz, P2FAz, and P3FAz) with different numbers of fluorene units and an azobenzene unit were synthesized and characterized using UV-vis and polarized absorption spectroanalysis. The trans-cis photoisomerization was conformed under 400 nm light irradiation for all copolymers in chloroform. However, in the film state, only the trans-cis photoisomerization occurred by mono-fluorene attached copolymer poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-4,4′-azobenzene)] (P1FAz). Photo-induced alignment was achieved using the P1FAz film after irradiation with linear polarized 400 nm light and subsequent annealing at 60 °C. Surface orientation of a spin-coating film of poly(9,9-didodecylfluorene) (F12) was achieved using the photo-induced alignment layer of the P1FAz film after annealing at 90°C. The photo-induced alignment layer of P1FAz has potential application to the surface orientation technique for appropriate polymers, which will be useful for the fabrication of optoelectronics devices. © 2012 Wiley Periodicals, Inc.