Novel design and synthetic methodologies in developing electrooptically active organic polymers. - Page 135 |
Save page Remove page | Previous | 135 of 159 | Next |
|
small (250x250 max)
medium (500x500 max)
Large (1000x1000 max)
Extra Large
large ( > 500x500)
Full Resolution
All (PDF)
|
This page
All
|
HO
“ h OCN
\I
tri-linJcer
NLÔ segment NCO
HO
NHCO O.
QQ
U nfortunately, polymers resulted from both Scheme 3.9 and Scheme 3 . 1 0
exhibited very poor optical quality, the film s were generally non-uniform and phase
separation is so severe that can be viually observable. Both the monomers have very poor
so lu b ility in dioxane, thus more suitable solvents are needed to accomdate the solubility o f
dis-isocyanate monomer and optical quality o f the thin film s.
3.3.3 O p tic a l p ro p e rtie s o f N LO chro m o phores
Since all o f the r^^ measurements were taken at 1.064 nm, in order to assure
whether the obtained results is resonantly enhanced due to the chromophore absorption, it
was necessary to scan the absorption o f monomer over IR region. This is also necessary to
pre-determine the sources o f the later measured optical loss o f polym er film , if the
polymers exhibit no absorption at the operating wavelength ( 1.3 pm ), a conclusion can be
drawn that the optical loss is caused by light scattering due to chromophore aggregation or
phase separation. A ll the chromophores were dissolved in chloroform (generally,
absorptions o f high pP chromophores are red shifted in CHCI3, the Xmax’ s o f TCN and
SDZ in CHCI3 are comparable to their dried polymer thin film s), and the concentration o f
123
Reproduced with permission of the copyright owner. Further reproduction prohibited without permission.
Object Description
Description
| Title | Novel design and synthetic methodologies in developing electrooptically active organic polymers. - Page 135 |
| Repository email | cisadmin@lib.usc.edu |
| Full text | HO “ h OCN \I tri-linJcer NLÔ segment NCO HO NHCO O. QQ U nfortunately, polymers resulted from both Scheme 3.9 and Scheme 3 . 1 0 exhibited very poor optical quality, the film s were generally non-uniform and phase separation is so severe that can be viually observable. Both the monomers have very poor so lu b ility in dioxane, thus more suitable solvents are needed to accomdate the solubility o f dis-isocyanate monomer and optical quality o f the thin film s. 3.3.3 O p tic a l p ro p e rtie s o f N LO chro m o phores Since all o f the r^^ measurements were taken at 1.064 nm, in order to assure whether the obtained results is resonantly enhanced due to the chromophore absorption, it was necessary to scan the absorption o f monomer over IR region. This is also necessary to pre-determine the sources o f the later measured optical loss o f polym er film , if the polymers exhibit no absorption at the operating wavelength ( 1.3 pm ), a conclusion can be drawn that the optical loss is caused by light scattering due to chromophore aggregation or phase separation. A ll the chromophores were dissolved in chloroform (generally, absorptions o f high pP chromophores are red shifted in CHCI3, the Xmax’ s o f TCN and SDZ in CHCI3 are comparable to their dried polymer thin film s), and the concentration o f 123 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. |
