2.2 Porous Hydrogel Synthesis
PEGDA (weight-average molecular weight 3400g=mol) was purchased from SunBio (Anyang City, South Korea). The photoinitiator 2-hydroxyl-1-[4-(hydroxyethoxy)phenyl]-2-methyl-1-propanone (Irgacure 2959) was supplied by Ciba Specialty Chemicals (Basel, Switzerland). Both were used as received.