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• W1996165447 abstract "Biomedical polymers that are designed to degrade faster at slightly acidic pH values may potentially be developed for use in drug delivery, pharmaceutical formulation and regenerative medicine. Water-soluble polyacetals derived from two well known pendent functionalised tyrosine-based diphenol monomers were prepared. Acid catalysed copolymerisation of triethylene glycol divinyl ether with the diphenol was first used to confirm the 1H-NMR signals for the acetal moieties. A ter-polymerisation process employing the divinyl ether and the diphenol with poly(ethylene glycol) (PEG, 3?400 g mol-1) gave the desired water-soluble polyacetals with weight average molecular weights ranging from 24?000–71?000 g mol-1 (PDI 1.6–2.9). Diphenol incorporation into the polymer mainchain was less efficient than aliphatic hydroxyl incorporation from PEG. Thermal properties positively correlated with the relative amount of PEG that was incorporated into the polymer mainchain. The ter-polyacetals displayed enhanced rates of hydrolysis at pH 5.5 with little hydrolysis occurring at pH 7.4 over a 4 day period. Degradation was faster overall than that observed for polyacetals derived from aliphatic monomers only. Air–water contact measurements were lower for the ter-polyacetals than for PEG alone. Overall the properties of the ter-polyacetals were influenced more by the characteristics of PEG in the polymer mainchain than the structure of the two pendent chains that were examined." @default.
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• W1996165447 date "2005-01-01" @default.
• W1996165447 modified "2023-10-11" @default.
• W1996165447 title "Water-soluble polyacetals derived from diphenols" @default.
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• W1996165447 doi "https://doi.org/10.1039/b414803g" @default.
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