| Autor: |
Sunkyu Kim, Yeongje Lee, Jongmin Park, Yujin So, Hee-Tae Jung, Min Jae Ko, Jong Chan Won, Sunho Jeong, Yun Ho Kim |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
ACS applied materialsinterfaces. |
| ISSN: |
1944-8252 |
| Popis: |
Here, we proposed an eco-friendly synthetic method for synthesizing hybrid composites with ultralow dielectric properties at high frequencies up to 28 GHz for true 5G communication from aqueous aromatic polyimide (PI) polymers and dual-porous silica nanoparticles (DPS). The "one-step" water-based emulsion template method was used to synthesize the macroporous silica nanoparticles (MPS). A substantially negative ζ potential was produced along the surface of MPS by the poly(vinylpyrrolidone)-based chemical functionalization, enabling excellent aqueous dispersion stability. The water-soluble poly(amic acid) (PAA), as a precursor to PI, was also "one-step" polymerized in an aqueous solution. The MPS were dispersed in a water-soluble PAA matrix to create the hybrid composite films using an entirely water-based approach. The compatibility between the PAA matrix and MPS was elucidated by investigating relatively diverse end-terminated PAAs (with either amine or carboxyl group). It was also discovered that, during a thermally activated imidization reaction, the MPS are in situ converted into the DPS with macro- and microporous structures (with a surface area of 1522.4 m |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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