Van Lijsebetten, Filip published the artcileReprocessing of Covalent Adaptable Polyamide Networks through Internal Catalysis and Ring-Size Effects, Name: Dimethyl adipate, the publication is Journal of the American Chemical Society (2021), 143(38), 15834-15844, database is CAplus and MEDLINE.
Here, we report the introduction of internally catalyzed amide bonds to obtain covalent adaptable polyamide networks that rely on the dissociation equilibrium between dicarboxamides and imides. While amide bonds are usually considered to be robust and thermally stable, the present study shows that their dynamic character can be activated by a smart choice of available building blocks without the addition of any external catalyst or other additives. Hence, a range of polyamide-based dynamic networks with variable mech. and viscoelastic properties were obtained in a systematic study, using a straightforward curing process of dibasic ester and amine compounds Since the dissociation process involves a cyclic imide formation, the correlation between ring size and the thermomech. viscosity profile was studied for five- to seven-membered ring intermediates, depending on the chosen dibasic ester monomer. This resulted in a marked temperature response with activation energies in the range of 116-197 kJ mol-1, yielding a sharp transition between elastic and viscous behavior. Moreover, the ease and versatility of this chem. platform were demonstrated by selecting a variety of amines, resulting in densely cross-linked dynamic networks with Tg values ranging from -20 to 110°C. With this approach, it is possible to design amorphous polyamide networks with an acute temperature response, allowing for good reprocessability and, simultaneously, high resistance to irreversible deformation at elevated temperatures
Journal of the American Chemical Society published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C12H13F2N3O4S, Name: Dimethyl adipate.
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