Synergistic effect of polyurethane‐coated carbon fiber and electron beam irradiation on the thermal/mechanical properties and long‐term durability of polyamide‐based thermoplastic composites

To attain thermoplastic polymer composites with enhanced thermal and mechanical properties as well as long‐term durability, in this study, polyurethane‐coated carbon fiber (CF) and electron beam (EB) irradiation are adopted as an effective reinforcing filler and efficient crosslinking process, respe...

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Bibliographic Details
Published in:Polymer composites 2022-03, Vol.43 (3), p.1685-1697
Main Authors: Kim, Soo‐Yeon, Gang, Ha‐Eun, Park, Gyu‐Tae, Jeon, Ha‐Bin, Kim, Hyun Bin, Oh, Seung‐Hwan, Jeong, Young Gyu
Format: Article
Language:English
Subjects:
Adhesion
carbon fiber
Carbon fiber reinforced plastics
Carbon fibers
Coated fibers
Coating effects
composites
Crosslinking
Durability
Dynamic mechanical properties
Dynamic stability
electron beam irradiation
Electron beams
Electron irradiation
Fillers
long‐term mechanical property
Mechanical properties
polyamide
Polyamide resins
Polymer matrix composites
Polyurethane resins
Pressure molding
Radiation dosage
Storage modulus
Superposition (mathematics)
Synergistic effect
Thermal stability
Thermodynamic properties
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Summary:To attain thermoplastic polymer composites with enhanced thermal and mechanical properties as well as long‐term durability, in this study, polyurethane‐coated carbon fiber (CF) and electron beam (EB) irradiation are adopted as an effective reinforcing filler and efficient crosslinking process, respectively. For this purpose, polyamide 6 (PA)‐based composites with different CF contents of 1–10 wt% were fabricated through melt‐compounding and compression molding, and then irradiated with various EB doses of 50–200 kGy. The SEM and FT‐IR data reveal that CFs are well dispersed in the PA matrix with excellent interfacial adhesion via specific intermolecular interactions, which are even enhanced for the composites with crosslinked PA matrices after the EB irradiation. As the result, the thermal stability (initial decomposition temperature and residue at 800°C) and dynamic mechanical properties of PA/CF composites increased noticeably with increasing the CF content and EB irradiation dose. The initial storage modulus of 1.90 GPa for neat PA at 30°C was improved significantly to 2.94 GPa by 10 wt% CF addition and to 4.67 GPa by 200 kGy EB irradiation. In particular, the long‐term mechanical properties of PA/CF composites, which were evaluated using a stepped isothermal method based on the time–temperature superposition principle, were found to be highly enhanced by the synergistic effect of CF filler reinforcement, EB‐induced PA matrix crosslinking, and improved interfacial adhesion. Polyamide 6 (PA)‐based thermoplstic composites reinforced with 1‐10 wt% polyurethane‐coated short carbon fibers (CFs) are fabricated by melt‐mixing and electron beam (EB) irradiation. There exist specific interactions between CFs and PA in the composites. The thermal stability and mechanical property of the composites increase with the CF content and the EB irradiation dose. The long‐term mechanical durability of the composites is highly improved by the synergistic effect of CF filler and EB‐induced crosslinking.
ISSN:0272-8397
1548-0569
DOI:10.1002/pc.26488