Facile synthesis of new NLO‐functionalized polyimides via Mitsunobu reaction
作者:Chong‐Bok Yoon、Hong‐Ku Shim
DOI:10.1039/a904598h
日期:——
Three polyimides containing a nonlinear optical (NLO) chromophore were prepared through a new synthetic pathway. Coupling of dihydroxy and diimide compounds yielded the polyimide. Due to the mild conditions of polymerization, a chemically labile hemicyanine dye could be incorporated in the polyimide backbone successfully. The molecular weights of the polyimides obtained ranged from 8200 to 14 400, and the glass transitions occurred between 135 °C and 198 °C. The second-order NLO properties were characterized by using the second harmonic generation (SHG) technique. The second-order NLO coefficients (χ
(2)
) of the polyimides were 82 pm V
–1
and 122 pm V
–1
with reference to quartz crystal, and the nonlinearity of those polymers was stable at 100 °C without large loss.
通过一种新的合成途径,制备了三种含有非线性光学(NLO)发色团的聚酰亚胺。将二羟基和二酰亚胺化合物偶联得到聚酰亚胺。由于聚合条件温和,化学不稳定的半花菁染料成功地并入聚酰亚胺主链中。所得聚酰亚胺的分子量范围在8200至14400之间,玻璃化转变温度介于135°C至198°C之间。通过二次谐波产生(SHG)技术表征了其二阶非线性光学性能。相对于石英晶体,聚酰亚胺的二阶非线性光学系数(χ
(2)
)分别为82 pm V
–1
和122 pm V
–1
,且这些聚合物在100°C时非线性特性保持稳定,无明显损失。
Polyurethanes prepared from non-linear optical active diols
申请人:Akzo Nobel N.V.
公开号:EP0350112A1
公开(公告)日:1990-01-10
Polyurethanes prepared from non-linear optical active diols (NLO-diols) of the formula according to claim 1, of which the essence is that they have a delocalized π electron system to which both an electron donor group and an electron acceptor group are coupled directly (DπA system). The polyurethanes have high hyperpolarizability densities and other favourable properties and can be easily prepared. They are to be used in optical waveguides.
The invention pertains to a non-linear optically active (NLO) side chain polycarbonate and to NLO active waveguides containing said polycarbonate. Waveguides containing this NLO polycarbonate have a low loss of signal. Polycarbonates based on bischloroformates of hexafluorobisphenol A , hexafluorotetrabromobisphenol A and bisphenol S or deuterated bisphenol A or sulphonylbiphenol are especially preferred within the framework of the invention: they were found to give an exceptionally low loss of signal. The invention further pertains to cross-linkable and already cross-linked polycarbonates. Especially preferred polycarbonates according to the invention are those where the diol comprises a rigid donor group. These polycarbonates have a high Tg, which renders them thermally stable.
本发明涉及一种非线性光学活性(NLO)侧链聚碳酸酯和含有上述聚碳酸酯的 NLO 活性波导。含有这种 NLO 聚碳酸酯的波导具有较低的信号损失。在本发明的框架内,基于六氟双酚 A、六氟四溴双酚 A 和双酚 S 的双氯甲酸酯或氘代双酚 A 或磺酰基联苯酚的聚碳酸酯尤为可取:因为发现它们的信号损失特别低。本发明还涉及可交联和已交联的聚碳酸酯。根据本发明,二元醇包含刚性供体基团的聚碳酸酯尤其受青睐。这些聚碳酸酯具有较高的 Tg,使其具有热稳定性。
An optical article containing a polymeric matrix exhibiting a high level of second order polarization susceptibility
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0313476B1
公开(公告)日:1992-12-23
NON-LINEAR OPTICALLY ACTIVE POLYURETHANES HAVING HIGH GLASS TRANSITION TEMPERATURES