Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (10): 2351.doi: 10.7503/cjcu20111022

• Polymer Chemistry • Previous Articles     Next Articles

Photoinduced Orientation of Two Dendritic Azo Amorphous Molecular Materials

WANG Yan-Wei, HE Ya-Ning, WANG Xiao-Gong   

  1. Laboratory of Advanced Materials, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2011-11-03 Online:2012-10-10 Published:2012-09-12

Abstract:

The orientation behavior of two dendritic azo compounds, G1-AZ-CN and G2-AZ-CN were studied by photoinduced birefringence method and polarized infrared spectroscopy. The chemical structure difference between G1-AZ-CN and G2-AZ-CN is the density of azo chromophore. The orientation rate, relaxation rate and saturated orientation level of dendritic azo compound are related to its special chemical structures. Both azo chromophore and dendritic core of G2-AZ-CN show faster orientation rate but slower relaxation rate than that of G1-AZ-CN, which could be attributed to the higher azo chromophore density of G2-AZ-CN. G1-AZ-CN reserved higher photoinduced orientation after relaxation than G2-AZ-CN. The saturated orientation level of both azo chromophore and dendritic core of G1-AZ-CN is higher than that of G2-AZ-CN, in which the special chemical structure can play a critical role.

Key words: Photo-induced orientation, Dendritic azo compound, Amorphous molecular material, Polarized FTIR spectrum

CLC Number: 

TrendMD: