ABSORPTION PROPERTIES AND STRUCTURE CHANGES CAUSED BY PRE-ANNEALING IN POLYDIACETYLENE LANGMUIR-BLODGETT-FILMS

被引:17
作者
KANEKO, F [1 ]
SHIBATA, M [1 ]
KOBAYASHI, S [1 ]
机构
[1] NIIGATA UNIV,GRAD SCH SCI & TECHNOL,NIIGATA 95021,JAPAN
关键词
D O I
10.1016/0040-6090(92)90338-C
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Absorption properties and structures are investigated as a function of pre-annealing temperature for PDA LB films. Absorption spectra of PDA LB films without pre-annealing have main peaks at 640 nm, while the pre-annealed 10-8 PDA LB films have new absorption peaks at 704 nm, i.e. a new blue phase. X-Ray diffraction measurements show that the pre-annealed films have extremely ordered layer structures. However, main peaks are observed at 640 nm for the pre-annealed 14-8 PDA LB films and the peaks only decrease with pre-annealing. because the layer spacing increases with pre-annealing and the polymerization is disturbed. Properties of the 12-8 PDA LB films depend upon the deposition temperature. The films, deposited at 20-degrees-C and at 13-degrees-C, have similar properties to the 10-8 PDA LB films and the 14-8 PDA LB films, respectively. The films having 704 nm peaks exhibit strong reversible color phase transitions between the new blue phase and the red phase. Pre-annealing is thought to be an important technique for controlling and improving characteristics of LB films.
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页码:548 / 550
页数:3
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