Four Janus NLO dendrimers were intelligently designed and synthesized with largely enhanced NLO performance.

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 d 33 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.

Photo-crosslinkable second order nonlinear AB2-type monomers: convenient synthesis and enhanced NLO thermostability.

A Janus molecule J2 containing five FTC moieties exhibited good thermal stability, excellent electro-optic performance and good temporal stability.

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