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<p>Turbostratic carbon materials with high electrical conductivity are important for electronic applications, yet conventional precursors require complex processing while yielding suboptimal performance. We introduce poly(m-phenyl benzophenone) (PBMP) copolymers with rigid-rod p-phenylene architecture as superior carbon precursors that combine excellent processability with enhanced carbonization performance. Three copolymers with varying monomer ratios, PBMP-0, PBMP-0.15, and PBMP-0.5, were synthesized. The PBMP copolymers display exceptional thermal stability (<i>T</i><sub>5%</sub> &gt; 540&#xa0;°C) and high carbonization yields (72–78%) at 1000&#xa0;°C without requiring preprocessing steps, substantially outperforming conventional precursors like polyacrylonitrile (PAN, ~ 50%) and polyimide (PI, ~ 40%). Spectroscopic and structural analyses revealed that the carbonized PBMP films exhibit enhanced local structural ordering within a turbostratic carbon framework, together with a well-developed sp<sup>2</sup> carbon network. This structural optimization resulted in electrical conductivity of carbonized PBMP-0.5 of 468.1 ± 65.4&#xa0;S/cm compared to 95.0 ± 6.5&#xa0;S/cm for PAN. The exceptional performance is attributed to the precursor’s high aromaticity, rigid-rod backbone, and reduced heteroatom content, which collectively minimize structural disorder during carbonization. These findings establish PBMP copolymers as promising precursors for next-generation carbon materials in applications requiring high electrical conductivity and dimensional stability.</p>

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p-Phenylene rigid-rod polymer precursor architecture for superior carbonization yield and electrical conductivity

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Kiyong Kim,
  • Hojae Kim,
  • Jaedo Nam,
  • Jaeuk Sung

摘要

Turbostratic carbon materials with high electrical conductivity are important for electronic applications, yet conventional precursors require complex processing while yielding suboptimal performance. We introduce poly(m-phenyl benzophenone) (PBMP) copolymers with rigid-rod p-phenylene architecture as superior carbon precursors that combine excellent processability with enhanced carbonization performance. Three copolymers with varying monomer ratios, PBMP-0, PBMP-0.15, and PBMP-0.5, were synthesized. The PBMP copolymers display exceptional thermal stability (T5% > 540 °C) and high carbonization yields (72–78%) at 1000 °C without requiring preprocessing steps, substantially outperforming conventional precursors like polyacrylonitrile (PAN, ~ 50%) and polyimide (PI, ~ 40%). Spectroscopic and structural analyses revealed that the carbonized PBMP films exhibit enhanced local structural ordering within a turbostratic carbon framework, together with a well-developed sp2 carbon network. This structural optimization resulted in electrical conductivity of carbonized PBMP-0.5 of 468.1 ± 65.4 S/cm compared to 95.0 ± 6.5 S/cm for PAN. The exceptional performance is attributed to the precursor’s high aromaticity, rigid-rod backbone, and reduced heteroatom content, which collectively minimize structural disorder during carbonization. These findings establish PBMP copolymers as promising precursors for next-generation carbon materials in applications requiring high electrical conductivity and dimensional stability.