Fig. 4
From: Preparing a microemulsion-loaded hydrogel for cleaning wall paintings and coins
a Strain dependence, b frequency dependence, c curves of stress–strain of microemulsion-loaded PVA/PEI hydrogel prepared with the weight ratio change of PVA:PEI of 65:35, 70:30, 75:25, and 80:20. d Young’s Modulus and strain of microemulsion-loaded PVA/PEI hydrogel prepared with the weight ratio change of PVA:PEI of 65:35, 70:30, 75:25, and 80:20
