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In free radical polymerisation used for the preparation of hydrogels, specific chemical components are required to initiate polymer growth, create cross links, and form the polymer network. Commonly used free radical initiators include ammonium persulfate and potassium persulfate. These initiators decompose upon heating or in the presence of suitable activators to generate free radicals, which start the polymerisation _______ ____ ____ _____ ________ __________ ___ ____.
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