Study on medical polyvinyl alcohol (PVA) / polyvinyl pyrrolidone (PVP) hydrogel burns dressing

Polyvinyl alcohol (PVA)/polyvinyl pyrrolidone (PVP) hydrogel burns dressing has been prepared using freezing-thawing method. PVA content was chosen as 15%, the basic properties were tested, such as water content, the rate of water absorption and pH value, the mechanical properties and water transmissivities of hydrogels were analyzed when the PVP contents were difference. Experiments results show that the hydrogels diaphaneity is better, the biggest value of water contents are close to 90 percent; water transmissivity of hydrogels are over 120 percent; the pH value closes to the level of human body, the highest pH value reaches to 6.8; the tensile strength of hydrogel is 0.85 MPa when PVP content is 6 percent, reaches to the largest value; all water transmissivities is over 700 g·m^-2 ·24h^-1, PVA/PVP hydrogels property is better.