480600 Taking the Light out of Photopolymerization: Using a Central Composite Design to Optimize Transferable Shadow Cure

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Kathryn Classon, Dr. Sage Schissel and Dr. Julie L. P. Jessop, Chemical and Biochemical Engineering, The University of Iowa, Iowa City, IA

The mobility of long-lived active centers in cationic ring-opening photopolymerization facilitates polymer formation in areas never exposed to light, a process known as shadow cure. Additionally, a recently discovered method has found that these long-lived active centers can be moved before complete cure is achieved. This new method is called transferable shadow cure, and allows for increased polymer applications with the ability to polymerize thick and pigmented samples of virtually any geometry. Current understanding of this new transferable method is limited. To gain insight, a central composite design was created with four key experimental parameters: effective irradiance, sample depth, exposure area, and exposure time. These parameters were explored to optimize curing conditions in a commercially available epoxide by measuring the conversion of monomer to polymer. The design enabled the accurate prediction of conversion based on the four parameters. It was also shown that an optimum conversion could be reached within the ranges investigated of both effective irradiance and exposure time.

Extended Abstract: File Not Uploaded