A second-order nonlinear optical dendronized hyperbranched polymer containing isolation chromophores： achieving good optical nonlinearity and stability simultaneously  

作　　者：Haitao Yang Ziyao Cheng Cheng Liu Wenbo Wu Ke-Nan Zhang Shengang Xu Yingliang Liu Shaokui Cao Zhen Li 

机构地区：[1]School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China [2]Department of Chemistry, Wuhan University, Wuhan 430072, China

出　　处：《Science China Chemistry》2018年第5期584-591,共8页中国科学（化学英文版）

基　　金：supported by the Startup Research Fund of Zhengzhou University(1411320006);the National Natural Science Foundation of China(21325416,21274133)

摘　　要：Large nonlinear optical(NLO) coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept of "isolation chromophore", "isolation group" and dendritic structure, a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship. For the small dendritic molecule D-NS, it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 °C, which extremely limits its real application. After introducing D-NS into a dendronized hyperbranched polymer chains, the obtained DHP-NS also shows a high d33 value of101 pm/V, but much better stability than D-NS. Even when its thin film was heated to 120 °C, no obvious decay can be observed in the d33 value of DHP-NS. This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.Large nonlinear optical（NLO） coefficient and good stability, two essential factors to evaluate second-order NLO materials, are difficult to be achieved in one molecule simultaneously. Herein, by utilizing the concept of ＂isolation chromophore＂, ＂isolation group＂ and dendritic structure, a dendritic molecule D-NS and a dendronized hyperbranched polymer DHP-NS are prepared to investigate their structure-property relationship. For the small dendritic molecule D-NS, it exhibits a high d33 value of 140 pm/V.But this value can be easily dropped when the temperature is higher than 50 °C, which extremely limits its real application. After introducing D-NS into a dendronized hyperbranched polymer chains, the obtained DHP-NS also shows a high d33 value of101 pm/V, but much better stability than D-NS. Even when its thin film was heated to 120 °C, no obvious decay can be observed in the d33 value of DHP-NS. This work demonstrates an effective strategy to realize both large NLO effect and good stability simultaneously.

关 键 词：nonlinear optical dendritic structure dendronized hyperbranched polymer 

分 类 号：O631[理学—高分子化学]