Thiol–ene grafting from polylactic acid, polycaprolactone, and polyhydroxybutyrate

Rheological study of quaternary ammonium‐containing star‐shaped polylactic acid

“…As indicated in the previous work, for PLA‐Q, the molecular weight was not measurable by SEC, the obtained results were variable from one test to another and largely higher than the expected value. This fact was suspected to be a consequence of an ionic association between the PLA‐Q molecules (giving larger entities) and prompted the current study.…”

“…The synthesis of this polymer and its characterizations were detailed in previous works. [45][46][47][48] PLA-Q mean molecular weight was 6900 g.mol −1 , each branch was made of a linear chain of PLA of about 1000 g.mol −1 , the three branches were linked to a glycerol node to make the starshaped design. Quaternary ammonium compound with chloride as counter ion was grafted on chain ends of the star-shaped PLA, with a ratio of 4 molecules per branch, to make quaternary ammonium end-functionalized structures, with glass transition and melt temperatures of, respectively, 49.5 and 154.9 C.…”

“…Three branches star‐shaped polylactic acid bearing quaternary ammonium pendant groups (PLA‐Q) was studied, its chemical structure is shown in Scheme . The synthesis of this polymer and its characterizations were detailed in previous works . PLA‐Q mean molecular weight was 6900 g.mol −1 , each branch was made of a linear chain of PLA of about 1000 g.mol −1 , the three branches were linked to a glycerol node to make the star‐shaped design.…”

Polyphosphoesters: New Trends in Synthesis and Drug Delivery Applications

“…Needless to say that the post-polymerization reactions that can be applied to polymer sensitive toward hydrolytic degradation such as PPEs are quite restricted to reactions occurring quickly in mild conditions. Click chemistry, especially Huisgens alkyn-azide cycloaddition, [28] thiol-Michael type addition, [29] and thiol-ene addition [30] has already been evidenced as a highly efficient tool for post-polymerization chemical modifications of aliphatic polyesters. [31] They are particularly interesting since today thiol and azide compounds are readily available.…”

“…Click chemistry, especially Huisgens alkyn–azide cycloaddition, thiol–Michael type addition, and thiol–ene addition has already been evidenced as a highly efficient tool for post‐polymerization chemical modifications of aliphatic polyesters . They are particularly interesting since today thiol and azide compounds are readily available.…”