| 초록 |
Spiropyran which has unique optical properties due to reversible ring opening isomerization, have advantages when introduced to mechano chromic polymeric materials However, introducing spiropyran as a hydrophobic molecule, has limitation conjugating with hydrophilic polymer In this study, a novel spiropyran cross linker was synthesized by grafting poly(ethylene glycol)diacrylate (PEGDA) on both side of spiropyran to form SP PEGDA modulator Therefore, SP-PEGDA would allow us to cross link hydrogel possessing mechano responsiveness The properties of SP-PEGDA cross linked hydrogel, such as swelling ratio and elastic modulus, was controlled by varying concentration of SP PEGDA In addition, SP-PEGDA cross linked hydrogel generates internal stress due to 3D deformation in swelling process As a result, SP PEGDA cross linked hydrogel undergoes mechano chromic activation and shows color changes from yellow to purple responses to internal stress. |
