| As an important part of nonlinear optical?NLO?materials,organic/polymeric second-order nonlinear optical ones play an important role in optical information processing,data storage,etc.Recently,scientists introduced dendronized hyperbranched polymers with highly branched structure into second-order nonlinear optical materials,and studied their relationship between structure and properties.Based on their excellent work,six new dendronized hyperbranched polymers were designed and synthesized in this contribution,and their second-order nonlinear optical properties were also studied.The main contents and our conclusions are listed as follows:1.Dendronizedchromophoreswereintroducedintodendronized hyperbranched polymer chains by simple atom transfer radical polymerization,to construct main chain dendronized hyperbranched polymers P1-P3.As a consequence,the stability of NLO coefficients of the obtained dendronizerd hyperbranched polymers were improved.P1-P3 exhibited excellent second-order nonlinear optical properties,their second harmonic generation coefficients(d33values)were tested as 105 pm/V,97 pm/V,and 93 pm/V,with the onset tempreratures for decays in d333 values of 72°C,80°C,88°C,respectively.In comparison with the dendronized hyperbranched polymers with the same type of chromophores,P1-P3 exhibited better stability2.By the substitution reaction,azo reaction and esterification,AB2-type monomers M1 and M2 with nonlinear optical chromophores were successfully synthesized.Subsequently,hyperbranched polymers with degree of branching of 1is tried to prepared by Suzuki polymerization.3.The concept of“dendronized hyperbranched polymers”was used to design polymeric photorefractive materials.By cationic polymerization,the nonlinear optical chromophores were introduced to the periphery of dendronized hyperbranched polymers to enhance their degree of freedom.The results demonstrated excellent photorefractive effect,and the coupling gain coefficient??value?of P6 reached 131.8 cm-1. |
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