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- W4367835838 abstract "To determine the comparative thermal resistance of polydimethylsiloxane, polymaleimide, and pyromellitidiimide (PYRO) under different temperature constraints (scan, high isotherms, thermal shocks), four materials varying in their content of these different units and cross-linking density were synthesized and characterized. For this, two bismaleimide precursors, which are liquid at room temperature, were developed and polymerized by solvent-free radical polymerization. Two other polymaleimide-free materials with cross-linking densities comparable to those of the above materials were studied for comparison. Thermomechanical analysis of these materials showed that they were all elastomers (storage moduli between 1 and 10 MPa and Shore A hardness between 30 and 65). Their thermal stability was studied under temperature scan in air and in argon, at the 250 °C isotherm, and under thermal shocks. The nature of the cross-linking node (cyclosiloxane or maleimide), as well as the presence of PYRO, was decisive for the thermal stability of these materials. These conclusions were then confirmed by TGA-FTIR analyses. Finally, p(D4-PY-RSi) material (containing PYRO units and no polymaleimide) was the most stable of the four materials for long ageing times at 250 °C. However, during thermal shocks the stability of p(BMI-RSi) (with polymaleimide and without PYRO) became comparable to that of p(D4-RSi) (without polymaleimide or PYRO) (equivalent to 340 h at 240 °C)." @default.
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- W4367835838 date "2023-08-01" @default.
- W4367835838 modified "2023-09-27" @default.
- W4367835838 title "Contribution of polymaleimide, pyromellitidiimide and polydimethylsiloxane units to the thermal stability of polyimide-silicone materials" @default.
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- W4367835838 doi "https://doi.org/10.1016/j.polymdegradstab.2023.110392" @default.
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