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。
Polyimide blends, methods of making each and methods of use
申请人:King Abdullah University of Science and Technology
公开号:US11319439B2
公开(公告)日:2022-05-03
Embodiments of the present disclosure describe polyimide blend compositions, methods of making polyimide blend compositions, methods of using polyimides, membranes including polyimide blends, methods of making membranes including polyimide blends, methods of separating mixtures using the membranes including polyimide blends, and the like.