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Analysis of Solvent Effect on the Mechanical Properties of Poly (ether ether ketone) (PEEK) Using Nano-indentation
Tanveer Iqbal
Author NameAffiliationE-mail
Tanveer Iqbal Department of Chemical, Polymer & Composite Materials Engineering, University of Engineering & Technology, Lahore, KSK Campus, 54890 Pakistan tanveer@uet.edu.pk 
Abstract:
Poly (ether ether ketone) (PEEK) is a high-performance semi-crystalline thermoplastic polymer. Exposure of the polymeric surface to solvents can have a strong effect like softening/swelling of polymeric network or dissolution. In this study, nano-indentation analysis was performed to study the effect of acetone on the surface mechanical properties of PEEK using different exposure times. The experiments were performed with a constant loading rate (10 nm/sec) to a maximum indentation displacement (1000 nm). A 30-second hold segment was included at the maximum load to account for any creep effects followed by an unloading segment to 80% unloading. The indentation hardness and the elastic modulus were computed as a continuous function of the penetration displacement in the continuous stiffness mode (CSM) indentation. The experimental data showed that the peak load decreased from ≈ 5.2 mN to ≈ 1.7 mN as exposure time in solvent environment increased from 0 to 18 days. The elastic modulus and the hardness of PEEK samples also displayed a decreasing trend as a function of exposure time in the solvent environment. Two empirical models were used to fit the experimental data of hardness as a function of exposure time which showed a good agreement with the experimental values.
Key words:  Solvent, Nano-indentation, PEEK, Modulus, Hardness
FundProject:
Analysis of Solvent Effect on the Mechanical Properties of Poly (ether ether ketone) (PEEK) Using Nano-indentation
Tanveer Iqbal
摘要:
Poly (ether ether ketone) (PEEK) is a high-performance semi-crystalline thermoplastic polymer. Exposure of the polymeric surface to solvents can have a strong effect like softening/swelling of polymeric network or dissolution. In this study, nano-indentation analysis was performed to study the effect of acetone on the surface mechanical properties of PEEK using different exposure times. The experiments were performed with a constant loading rate (10 nm/sec) to a maximum indentation displacement (1000 nm). A 30-second hold segment was included at the maximum load to account for any creep effects followed by an unloading segment to 80% unloading. The indentation hardness and the elastic modulus were computed as a continuous function of the penetration displacement in the continuous stiffness mode (CSM) indentation. The experimental data showed that the peak load decreased from ≈ 5.2 mN to ≈ 1.7 mN as exposure time in solvent environment increased from 0 to 18 days. The elastic modulus and the hardness of PEEK samples also displayed a decreasing trend as a function of exposure time in the solvent environment. Two empirical models were used to fit the experimental data of hardness as a function of exposure time which showed a good agreement with the experimental values.
关键词:  Solvent, Nano-indentation, PEEK, Modulus, Hardness
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