Effects of fluoropolymer addition to an epoxy on scratch depth and recovery |
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| Authors: | Witold Brostow Bernard Bujard Patrick E Cassidy Haley E Hagg Pablo E Montemartini |
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| Affiliation: | (1) Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science, University of North Texas, P.O. Box 305310, Denton, TX 76203-5310, USA,;(2) The Shell Center for Polymer Science & Technology, Department of Chemistry, Southwest Texas State University, San Marcos, TX 78666, USA, |
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| Abstract: | Samples were prepared by addition of a fluorinated poly(aryl ether ketone) (12F-PEK) to a commercial epoxy resin and curing
at either 24 °C or 70 °C. The concentrations of fluoropolymer in the samples were 0, 5, 10, 20, 30, 40, and 50%. Phase inversion
facilitates the formation of more and more smooth surfaces for scratch testing with increasing fluoropolymer concentration.
A progressively increasing load from 0.03 N to 12 N was administered with a diamond tip to the surfaces of the samples; depths
were determined within ±7.5 nm. The original scratch depth is a function of the fluoropolymer concentration. Scratch recovery
(healing) reaches values up to 95%. Plots of the residual depth versus concentration of the fluoropolymer at 4, 6, 8, and
10 N reveal minima for all forces and both temperatures. Addition of only 5% or 10% 12F-PEK improves the scratch recovery
significantly. The results are explained by changes of material morphology with the fluoropolymer concentration.
Electronic Publication |
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| Keywords: | Scratch resistance Scratch depth polymer wear Epoxy surfaces Fluoropolymer |
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