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2. Hydroxypropylation The next step involves reacting the methylated cellulose with propylene oxide. This reaction introduces hydroxypropyl groups into the cellulose structure, enhancing the hydrophilicity of the polymer. The hydroxypropylation process is typically conducted under alkaline conditions and requires careful control of the reaction parameters to achieve the desired degree of substitution. The combination of both methyl and hydroxypropyl groups accounts for the unique properties of HPMC, including its water retention and film-forming capabilities.
hpmc synthesis

2. Emulsion Polymerization In this critical phase, the prepared monomers are subjected to a polymerization process, typically in a reactor. Under controlled temperatures, catalysts initiate the reaction, leading to the growth of polymer chains within the aqueous medium. This step requires careful monitoring of temperature, pH, and reaction time to ensure optimal polymerization and limit the formation of undesirable by-products.
redispersible polymer powder manufacturing process
