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Propyl methyl cellulose is synthesized through the chemical modification of cellulose, replacing hydroxyl groups with propoxy and methoxy groups. The degree of substitution of these groups determines the physical and chemical properties of the resulting polymer. PMC is known for its solubility in water, forming a gel-like consistency that can be manipulated based on the concentration used. Additionally, it is non-ionic, making it compatible with various other substances, including electrolytes, which enhances its versatility in formulations.