Journal
POLYMER
Volume 262, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.125457
Keywords
Polyarylene ether nitrile; Crystallization; Crosslinking; Self -reinforced polymer; Dielectrics
Categories
Funding
- National Natural Science Foundation of China
- [51903029]
- [52073039]
- [51773028]
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In this study, self-reinforced cross-linked polyarylene ether nitrile films were fabricated and their properties were finely tuned by controlling the crystallinity of PEN-OH. The CPEN films exhibited excellent performance and offered a new approach for designing high-performance polymeric dielectric materials.
Polymer dielectrics with outstanding temperature resistance and mechanical properties are expected to be used in 5G communication systems. Here, self-reinforced cross-linked polyarylene ether nitrile (CPEN) films were rationally designed and fabricated by introducing polyarylene ether nitrile terminated with hydroxyl (PEN-OH) into phthalonitrile end-capped polyarylene ether nitrile (PEN-Ph) and applying post-solid phase chemical reaction. For the catalytic effect on cross-linking reaction and crystallization enhancement of PEN-OH, the comprehensive performance of composite had been greatly improved, which showed a synergistic effect of crosslinking-crystallization. Intriguingly, properties of CPEN films can be finely tuned with the increase of PENOH crystallinity. The results show that CPEN films have excellent overall performance with a Tg of 390 degrees C, a long service life at 300 degrees C (4.05 x 102 min, 95 wt% residual weight), and low dielectric constant of 2.9. More commendably, CPEN film possessed a higher tensile modulus (3.6 GPa) of over 194% compared to the untreated film due to the crystals immobilized by chemical crosslinking reaction. Tuning the properties of composites by modulating the crosslinking-crystallization behavior opens up a new way to design high-performance polymeric dielectric materials.
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