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A New Class of Photoresponsive Polymers that Undergo Controlled and Complete Polymer Chain Scission Upon Irradiation at 300nm
Event Date: 05/16/2012 11:00 AM Eastern Daylight Time
Stimuli responsive materials are of interest in a number of applications. Of these, photoresponsive materials have a unique advantage since their response can be temporally controlled. We have developed a series of photodegradable phenacyl based polycarbonates. Hydroxyphenacyl based phototriggers, developed by Givens and coworkers, have been demonstrated to be a very efficient photoactivated protecting group for the release of esters, phosphates and thiols. We have incorporated this photoactive unit in the polymer backbone and irradiation of this polymer at 300 nm leads to polymer chain scission that results in substantial decrease in molecular weight. These polymers undergo photoinitiated degradation in both solution and the solid state. Well defined 2D patterns can be formed from films of these polymers by the use of simple masks. These polymers also have the potential for controlled release applications. As a model, the release of dyes such as rhodamine 6G or therapeutics such as indomethacin indicate controlled release upon irradiation of polymer films encapsulated with these molecules.
Moderator: Laura Bush Editorial Director LCGC North America Speakers: Abraham Joy Assistant Professor Department of Polymer Science The University of Akron
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