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Coloration of Ethyleneamine-Diacrylate-Based Porous Polymer-Toluene Systems Induced by the Christiansen Effect: Color
Naofumi Naga1,2, Risako Nakai2, Masafumi Yamato3
1Department of Applied Chemistry, College of Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
Abstract:
The aza-Michael addition reaction of ethyleneamine, diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), or pentaethylenehexamine (PEHA) with poly-(ethylene glycol) diacrylate (PEGDA) in ethanol at 20 °C yielded the corresponding porous polymers. The surface morphology of the porous polymers was composed of connected particles or cocontinuous monolithic structure, which were induced by phase separation. The TETA- and TEPA-PEGDA porous polymers turned half transparent and colored in toluene through the Christiansen effect. The transmission peak top (λmax) of the porous polymer-toluene system showed a blue shift with an increase in the observation temperature, and the complementary colors of the transmission peak were observed as the scattered light. The porous polymers based on TEPA/PEGDA/mono- or diacrylate with ethylene glycol or propylene glycol linkage and TEPA/diacrylate systems in toluene also showed the coloration. These polymers showed blue- or red-shifts of λmax depending on the molecular structure of mono- or diacrylate monomers. Effects of the molecular structure of the polymer networks on the coloration behavior were discussed.
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