Through a controllable “reactivate” ”graft” synthetic route, two asymmetrical “Janus” dendronized polymers (DPs) were successfully synthesized. Dendrons were grafted to a linear polymer motherboard by a story-by-story construction method. Due to the heterogenetic “Janus” structure, with orderly arranged chromophore moieties, the polymers demonstrated extremely large second-order nonlinear optical (NLO) coefficients and excellent NLO thermal stability. DP-4l and DP-6l had high d33 values of 232 and 227 pm/V, respectively, which reached the highest value reported so far for linear-based polymers containing simple azo-chromophore moieties. The controllable synthesis sheds light on the structure–property relationships of NLO polymers and other dendronized-structure functional polymers.

中文翻译：

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外部功能化树枝状聚合物的可控合成

通过可控制的“重新活化”“接枝”合成途径，成功合成了两种不对称的“ Janus”树枝状聚合物（DPs）。通过逐层构建方法将树突嫁接到线性聚合物母板上。由于异质的“ Janus”结构，发色团部分排列有序，聚合物表现出极大的二阶非线性光学（NLO）系数和出色的NLO热稳定性。DP-4l和DP-6l的d33值分别很高，分别为232和227 pm / V，达到了迄今为​​止报道的含简单偶氮发色基团的线性聚合物的最高值。可控制的合成揭示了NLO聚合物和其他树枝状结构功能聚合物的结构-性质关系。