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Materials (Basel). 2017 Aug 25;10(9). pii: E990. doi: 10.3390/ma10090990.

Improvement of Interaction in a Composite Structure by Using a Sol-Gel Functional Coating on Carbon Fibers.

Author information

1
Department of Mechanics, Materials Science and Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 25 Smoluchowskiego, 50-370 Wroclaw, Poland. anna.szczurek@pwr.edu.pl.
2
Department of Mechanics, Materials Science and Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 25 Smoluchowskiego, 50-370 Wroclaw, Poland. michal.barcikowski@pwr.edu.pl.
3
Department of Environmental Engineering, Wroclaw University of Science and Technology, 9 Grunwaldzki Square, 50-377 Wroclaw, Poland. karol.leluk@pwr.edu.pl.
4
Department of Mechanics, Materials Science and Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 25 Smoluchowskiego, 50-370 Wroclaw, Poland. bartosz.babiarczuk@pwr.edu.pl.
5
Department of Mechanics, Materials Science and Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 25 Smoluchowskiego, 50-370 Wroclaw, Poland. jerzy.kaleta@pwr.edu.pl.
6
Department of Mechanics, Materials Science and Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 25 Smoluchowskiego, 50-370 Wroclaw, Poland. justyna.krzak@pwr.edu.pl.

Abstract

The modification of carbon fibers for improving adhesion between fibers and an epoxy resin in composite materials has become the focus of attention. In this work the carbon fiber coating process has been devised in a way preventing the stiffening and clumping of fibers. To improve interactions between coated fibers and a resin in composites, four types of silica coatings with different organic functional groups (3-aminopropyl-coating 1, 3-mercaptopropyl-coating 2, 2-(3,4-epoxycyclohexyl) ethyl-coating 3, methyl-coating 4) were obtained. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to distinguish the changes of a carbon fibers surface after coating deposition. The thickness of the obtained coatings, including the diversity of thickness, was determined by transmission electron microscopy (TEM). The increase in surface free energy (SFE) of modified fibers, including the distinction between the polar and dispersive parts, was examined by wettability measurements using a tensometric test. The developed coating preparation process allowed to cover fibers separately with nanoscale silica layers, which changed their morphology. The introduction of organic functional groups resulted in surface free energy changes, especially an increase in specific polar surface energy components.

KEYWORDS:

adhesion; composite; silica; thin layer; wettability

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