Textile Finishing by K. L. Mittal Thomas Bahners & Thomas Bahners

Author:K. L. Mittal,Thomas Bahners & Thomas Bahners
Language: eng
Format: epub
ISBN: 9781119426851
Publisher: John Wiley & Sons, Inc.
Published: 2017-07-21T19:21:00+00:00

As mentioned before, the above discussion does not refer to layer deposition by means of photo-grafting, but refers to a simple chemical modification following the addition of ambient oxygen. Layer deposition nevertheless has significant importance in the design of fiber-coating or fiber-matrix adhesion, as explained in the following.

Fiber composite materials are generally manufactured by embedding textile structures made of organic or inorganic fibers in a polymer matrix. Mechanical properties of a fiber-reinforced composite are governed by the construction of the textile and fiber-matrix adhesion, but also by the relation of elastic moduli and tensile strengths of fiber and matrix polymers. Even if adhesion is strong, an abrupt change in mechanical properties at the fiber-matrix interface will result in reduced tenacity and insufficient damping of the composite. In contrast, many composite plant structures exhibit graded transitions of mechanical properties at the interfaces of fibers and fibrils and matrix.

Given this background, the scope of a recent study by the authors was to deposit organic thin-layers on reinforcement fibers by photopolymerization, thus mimicking natural structures, in order to increase adhesion as well as damping behavior in fiber composites. The results indicate a favorable effect on the properties of trend-setting composites made of polyolefins reinforced with regenerated cellulose if, e.g., PETA is used as the monomer [25]. Besides the hydrophobic nature of the deposited poly-PETA layers, it was known, too, that their high degree of cross-linking and homogeneity yield distinctive mechanical and thermo-mechanical properties [23]. Fiber-matrix adhesion – characterized by pull-out tests as well as interfacial shear strength – and damping of composite structures were found to be influenced by parameters of the photo-chemical process, with monomer concentration and UV exposure time being the main factors.

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