4.7 Article

Polyarylene ether nitrile composites film with self-reinforcing effect by cross-linking and crystallization synergy

期刊

POLYMER
卷 262, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2022.125457

关键词

Polyarylene ether nitrile; Crystallization; Crosslinking; Self -reinforced polymer; Dielectrics

资金

  1. National Natural Science Foundation of China
  2. [51903029]
  3. [52073039]
  4. [51773028]

向作者/读者索取更多资源

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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