Résumé
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•A linear polyacetal based on isosorbide is prepared in one step procedure.•The full cyclization of this linear polymer was successfully achieved.•Cyclic polyacetal presents higher thermal performances.•It is also defined by higher molecular weight characteristics.•This cyclic polymer is the only one that presents entanglements.
A linear biobased polyacetal was prepared from the reaction between isosorbide and methylene chloride according a one step procedure. Cyclic polyacetal was obtained using the previous linear polymer as precursor. The respective architectures of both polymers and their chemical compositions were carefully established using 1H NMR and MALDI-TOF spectroscopies. Their molecular weight characteristics were defined using a triple detection size exclusion chromatography while their thermal characteristics were investigated by the conduction of calorimetric and thermogravimetric experiments. The registering of the thermomechanical properties of each kind of isosorbide-based polyacetal showed that the cyclic polymer was the only one able to show a rubbery plateau. This peculiarity was justified by calculation of the threshold value above which entanglements were possible.