Mechano-responsive Fluorescence Property Of Hyperbranched Poly(aimdo Amine) And Its Application

In recent years,mechano-responsive fluorescent polymers had become the frontier in the field of polymer mechanical chemistry.Mechanical stimuli could change the molecular assembly of polymers and induce certain reactions,moreover,the application of these polymers in sensors,fluorescent switches and data storage had attracted people's attention.At present,most of the mechano-responsive fluorescent polymers were based on conjugated fluorescent dyes,and the reports on non-conjugated systems are still relatively few.However,the mechano-responsive fluorescence behavior of hyperbranched poly(amido amine)has not been reported.In the first part,the hyperbranched poly(amido amine)films were prepared by solution casting and explored the change of fluorescence intensity under different strain conditions.The results showed that:1)the fluorescence intensity of hyperbranched poly(amido amine)increased linearly with the increasing of tensile strain;2)the fluorescence intensity of hyperbranched poly(amido amine)could quickly return to the initial state without any external stimuli after releasing the tension;3)hyperbranched poly(amido amine)mechano-responsive fluorescence could be multiple reversible.In the second part,we prepared a hyperbranched poly(amido amine)film capable of emitting white light and studied its mechanochromic behavior.The results showed that:1)the hyperbranched poly(amido amine)white film underwent a transition from white light to blue light under the tension condition;2)the hyperbranched poly(amido amine)film would be able to quickly return from blue to white light state without external stimuli after releasing the tension;3)this mechanochromic behavior could be reversible many times.In conclusion,we had made some achievements in the research of mechano-responsive fluorescent functional materials based on hyperbranched polymers.These mechano-responsive films have good application prospects in the fields of force sensors and displays.We believed that based on hyperbranched polymers can create more and more interesting mechano-responsive fluorescent functional materials.