Abstract
This paper describes the preparation and second-order NLO properties of stilbazolium benzimidazolate covalently bound to a polyurea or a polyamic acid backbone. Polyureas PU1-3 were obtained by polyaddition reaction using 2-[4-(2-{4-[3- (3,5-diaminobenzoyloxy)propyloxy]phenyl}ethenyl) pyridinio]benzimidazolate (DA1), 1,4-piperazine and 2,4-toluenediisocyanate. From the second-harmonic generation (SHG) measurements using a Q-switched Nd:YAG laser (1064 nm) as an exciting beam after corona-poling at 140°C, PU3, which contained the smallest amount of stilbazolium benzimidazolate unit, exhibited the largest d33 value of 3.8 pm/V in the present series. Polyamic acid PA1 or PA2 was obtained by condensation polymerization between 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6-FDA) and DA1 or 2-[4-(2-{4-[3-(3,5-diaminobenzoyloxy) hexyloxy]phenyl}-ethenyl)pyridinio]benzimidazolate (DA2), respectively. PA2 exhibited the relatively large d33 value, 25 pm/V.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 47-50 |
| Number of pages | 4 |
| Journal | Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics |
| Volume | 22 |
| Issue number | 1-4 |
| State | Published - Dec 1 1999 |
| Event | Proceedings of the 1998 4th International Conference on Organic Nonlinear Optics (ICONO'4) - The 8th IKETANI Conference - Chitose, Jpn Duration: Oct 12 1998 → Oct 15 1998 |
ASJC Scopus subject areas
- Control and Systems Engineering
- Condensed Matter Physics