The issue of reduced flavor after neutralization of acidic polymers
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Polymer emulsions containing -COOH groups are known to have a strong odor. After neutralization with sodium hydroxide, the odor was significantly reduced. Could the previous odor have been caused by residual acid-containing monomers? If so, how can it be removed? Lab-scale feasible methods: Additionally, for an acid-containing monomer approximately, adding alkali solution for neutralization results in a strong acidic taste even when the pH value is >8. Theoretically, the odor of organic acids is mainly caused by H+, so there should be no odor after neutralization
A method to reduce residual acrylic monomers in polymers involves the continuous addition of a higher concentration of initiator or an initiator with greater activity, which can reduce the residual amount to below 100 ppm; at this level, the odor of acrylic acid is almost undetectable.