Abstract
The hydrolytic controlled release behavior of copolymers with pendent esters of the plant growth regulators naphthaleneacetic acid and indoleacetic acid have been studied utilizing reversed phase liquid chromatography with ultraviolet spectrometric detection. The release profiles for copolymers of acrylamide (AM) with 2-(1-napthylacetyl) ethyl acrylate (NAEA), 4-(1-napthylacetyl) butyl acrylate (NABA), 2-(1-napthylacetyl) ethyl acrylate (NAEMA), and 2-(indole-3-acetyl) ethyl acrylate (IAEA) were shown to depend upon the nature of the auxin monomer structure and its composition, molecular weight, and copolymer microstructure. Increasing the mean sequence lengths of the hydrophilic sections of the copolymers was shown quantitatively to result in higher rates of hydrolytic release.
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