Polar alignment and main-chain structure in azo-polymers
Por:
Aoyama T., Beristain M.F., Ogawa T., Wada T.
Publicada:
1 ene 2005
Resumen:
We discuss the correlation between polar alignment and main-chain structure in newly synthesized 4 kinds of azo-polymers containing dipropargyloxybenzoates in the main chain and Disperse Red 1 in the side chain. Those polymers have the same molecular formula, but different structural isomerism in the main chain. In order to observe electric-field induced alignment, an in-situ SHG measurement was performed. The SHG signals for the 2,5- and 3,4-polymers gradually increased with time for more than 2 hours and reached to a high signal level, while the ones for the 2,4- and 3,5-polymers quickly saturated at a low signal level. The polar alignment was also confirmed by the absorbance change induced by the poling. The 2,5- and 3,4-polymers showed larger order parameters than those of the 2,4- and 3,5-polymers. Additionally, the larger SHG coefficients were determined for the 2,5- and 3,4-polymers by the Maker fringe method. These results indicate that the 2,5- and 3,4-polymers are aligned more easily than 2,4- and 3,5-polymers, and the tuning of the main-chain structure is important to achieve the efficient polar alignment.
Filiaciones:
Aoyama T.:
RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Beristain M.F.:
Universidad Nacional Autonoma de Mexico, Apartado Postal 70-360, CU, México DF. 04510, Mexico
Ogawa T.:
Universidad Nacional Autonoma de Mexico, Apartado Postal 70-360, CU, México DF. 04510, Mexico
Wada T.:
RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
|