两个二阶非线性光学高分子的合成与性能：改善高分子光学非线性-透明性矛盾的尝试

通过后功能化反应将两个新的非线性光学发色团（1和2）分别作为侧链引入聚芳醚砜主链，得到两个新的非线性光学高分子（P1和P2）。这两个发色团（1和2）被设计为含有相同的电子给体（二烷基氨基）和相同的电子受体（TCF），但含有不同长度的共轭桥，即2包含一个组合共轭桥（苯基二氮烯 + 苯乙烯），而1的共轭桥要短得多（仅为苯乙烯）。研究了P1和P2的线性和非线性光学性质。与P1相比，P2在呈现出相近的非线性光学系数（d₃₃）的同时异乎寻常地达到了更好的光学透明性（最大吸收波长蓝移16 nm）。结果表明：组合共轭桥结构的引入对于在非线性光学高分子的非线性-透明性之间达到某种平衡起到了良好作用。

Synthesis and Properties of Two Second‐Order Nonlinear Optical Polymers: an Attempt toward the Balance between Nonlinearity and Transparence against Intrinsic Trade‐off

Two new poly(arylene ether sulfone)s ( P1 and P2 ) with two new accepting group (TCF)‐based chromophores ( 1 and 2 ) in side chains, respectively, were designed and synthesized. The two chromophores contain the same electron donating group (dialkylamino group) and the same accepting group (TCF), but different conjugation bridges. Compound 2 contains a combined conjugation bridge (phenyl‐diazene plus styrene), but the bridge of 1 is much shorter (styrene only). A variety of optical properties were studied. Compared with P1 , P2 exhibited comparable nonlinear optical coefficient (d₃₃) and better transparency (the maximum absorption was blue‐shifted by 16 nm), though the conjugation bridge of chromophore 2 in P2 was much longer than that of 1 in P1 . This result may help design nonlinear optical polymers achieving the balance between nonlinearity and transparence against the intrinsic trade‐off.