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The solubility of PVA in water is significantly impacted by several factors, including molecular weight, degree of hydrolysis, and temperature. Generally, PVA can be classified into different grades based on these parameters. Higher molecular weight PVA tends to have lower solubility in water due to the increased size of the polymer chains, which can create entanglement that restricts solvation. On the other hand, PVA with a higher degree of hydrolysis, which indicates more hydroxyl groups, exhibits better solubility in water.