4.7 Article

Thermally stable and highly recyclable carbon fiber-reinforced polyketone composites based on mechanochemical bond formation

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.106251

关键词

Polymer-matrix composites; Carbon fibre; Recycling; Thermal properties

资金

  1. Technology Innovation Program - Ministry of Trade, Industry AMP
  2. Energy (MOTIE, Korea) [20011439]
  3. Korea Institute of Science and Technology internal project [2E31162]
  4. KUKIST Graduate School
  5. Korea Evaluation Institute of Industrial Technology (KEIT) [20011439] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The study proposed a novel method to improve the thermal stability of PK-based carbon fiber-reinforced polymers using plasma-assisted mechanochemistry. The processed CFRPs showed higher glass transition temperatures and storage moduli, leading to improved thermal stability. After annealing at 150 degrees C for 1000 hours, the tensile strength remained above 90%.
Compounding polyketone (PK) with carbon fibers (CFs) can provide composites that exhibit excellent properties. However, the thermal stability of PK itself is poor, limiting practical applications at high temperatures. Herein, a novel process is proposed to improve the thermal stability of PK-based carbon fiber-reinforced polymers (CFRPs). The plasma-assisted mechanochemistry (PMC) process creates mechanochemical bonds between materials under dry conditions, reducing polymer chain mobility at high temperatures and increasing the stiffness. Compared with conventional PK-based CFRPs, PMC-processed CFRPs have significantly higher glass transition temperatures and storage modulus, resulting in improved thermal stability. The tensile strength remained >90% after annealing at 150 degrees C for 1000 h. Moreover, despite repeated thermal hysteresis, the recycled PK-based CFRPs showed tensile strength, Young's modulus, and elongation at break that were >90% of initial values. This work provides a feasible and ecofriendly strategy to expand the applications and promote repeated recycling of PK-based CFRPs.

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