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• W2971756044 endingPage "107401" @default.
• W2971756044 startingPage "107401" @default.
• W2971756044 abstract "High stability of low-κ value in a broad temperature region is a critical property for low dielectric constant polymer materials especially when they are served in some harsh conditions. However, most polymer dielectrics always exhibit a significant variation in dielectric property at around Tg or sub-Tg due to the local segment or chains motion, thus, low-κ polymer dielectrics are limited to a relatively narrow working temperature region. Herein, we described a series of novel crosslinked polyimide (PI) thermosets by blending a reactive Cardo-containing diluent into the PI oligomer, the dielectric constants of which were greatly reduced from 3.4 to 2.5 and were surprisingly stable over a temperature region of -150-250 °C. Meanwhile, the cured blended thermosets exhibited a 32–139 °C increase in Tg compared to the pristine PI. Detailed analyses have illustrated that the significantly reduced κ value, highly stable dielectric property and superior stability of these blended samples are originated from the synergistic effects of the large free-volume of Cardo-containing diluent, looser molecule packing resulted from the TR reaction and the highly crosslinked network. This desirable combination of facile processability, attractive dielectric behavior and excellent thermal stability makes them potential utilization in aerospace, microelectronic industries and other harsh environment applications." @default.
• W2971756044 created "2019-09-12" @default.
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• W2971756044 date "2019-11-01" @default.
• W2971756044 modified "2023-10-01" @default.
• W2971756044 title "Preparation of low-κ polyimide resin with outstanding stability of dielectric properties versus temperature by adding a reactive Cardo-containing diluent" @default.
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• W2971756044 doi "https://doi.org/10.1016/j.compositesb.2019.107401" @default.
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