Poly(styrene
-co-maleic anhydride)s were modified with poly(propylene oxide (PO)
-co-ethylene oxide (EO)) side chains (Jeffamine
®) with different EO/PO molar ratios, varying between 0.11 and 3.60. These copolymers were then further functionalized with a
β-mercapto ketone of
δ-damascone.
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Poly(styrene
-co-maleic anhydride)s were modified with poly(propylene oxide (PO)
-co-ethylene oxide (EO)) side chains (Jeffamine
®) with different EO/PO molar ratios, varying between 0.11 and 3.60. These copolymers were then further functionalized with a
β-mercapto ketone of
δ-damascone. The obtained poly(maleic acid monoamide)-based
β-mercapto ketones were then studied as delivery systems for the controlled release of
δ-damascone by retro 1,4-addition. The release of
δ-damascone, a volatile, bioactive molecule of the family of rose ketones, was studied by dynamic headspace analysis above a cotton surface after deposition of a cationic surfactant containing fabric softening formulation, as a function of the ethylene oxide (EO)/propylene oxide (PO) molar ratio of the grafted copolymer side chains. The polarity of the EO/PO side chain influenced the release efficiency of the damascone in a typical fabric softening application. PO-rich copolymers and the corresponding poly(styrene
-co-maleic anhydride) without Jeffamine
® side chains were found to be less efficient for the desired fragrance release than the corresponding bioconjugate with a EO/PO ratio of 3.60 in the side chain. This copolymer conjugate seemed to represent a suitable balance between hydrophilicity and hydrophobicity to favor the release of the
δ-damascone and to improve the deposition of the conjugate from an aqueous environment onto a cotton surface.
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