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The degradation behaviour of a new class of multi-block copolymers containing poly(d,l-lactic-glycolic acid) (PLGA) and poly(ethylene glycol) (PEG) segments was studied under conditions mimicking those found in biological fluids. The dissolution times of the new PLGA-PEG multi-block copolymers mainly depend on the length of the PEG segments present in their structure, i.e., on their PEG content on...
A synthetic process for obtaining high-molecular-weight block copolymers containing poly(lactic-glycolic acid) and poly(ethylene glycol) segments has been established. This process involves the reaction of poly(ethylene glycols) with phosgene, followed by polycondensation of the resulting α,ω-bis(chloroformates) with poly(lactic-glycolic acid) oligomers. The copolymers have been characterized for...
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