Abstract
This experimental study is associated with the modification of glass fibers with efficient, organic, functional, thermoelectrically enabled coatings. The thermoelectric (TE) behavior of the coated glass fiber tows with either inherent p semiconductor type single wall carbon nanotubes (SWCNTs) or the n-type molecular doped SWCNTs were examined within epoxy resin matrix in detail. The corresponding morphological, thermogravimetric, spectroscopic, and thermoelectric measurements were assessed in order to characterize the produced functional interphases. For the p-type model composites, the Seebeck coefficient was +16.2 μV/K which corresponds to a power factor of 0.02 μW/m∙K2 and for the n-type −28.4 μV/K which corresponds to power factor of 0.12 μW/m∙K2. The p–n junction between the model composites allowed for the fabrication of a single pair thermoelectric element generator (TEG) demonstrator. Furthermore, the stress transfer at the interphase of the coated glass fibers was studied by tow pull-out tests. The reference glass fiber tows presented the highest interfacial shear stress (IFSS) of 42.8 MPa in comparison to the p- and n-type SWCNT coated GF model composites that exhibited reduced IFSS values by 10.1% and 28.1%, respectively.
Highlights
During the last decades, the growing demand for the utilization of lightweight, high-performance structural composite materials has rapidly increased in various commercial sectors, such as the aerospace and automotive industries
Contact angle (CA) measurements and scanning electron microscopy (SEM) were employed in order to assess the specific morphological characteristics of the produced nanocoated glass fibers (GFs), while their thermal stability was investigated via thermal gravimetric analysis (TGA)
single wall carbon nanotubes (SWCNTs) coated GFs were acquired at ambient conditions, as well as at temperature differences of 50 ◦ C and 100 ◦ C by performing measurements at 75 ◦ C and 125 ◦ C
Summary
The growing demand for the utilization of lightweight, high-performance structural composite materials has rapidly increased in various commercial sectors, such as the aerospace and automotive industries. The material in relation to both its structural and non-structural services is an inherent ability of advanced composites and is rapidly emerging technology for their generation. Understanding their mechanical behavior requires the study of the interface, the common physicochemical areas between the distinct phases (reinforcing and matrix materials) [1,2]. This is a prerequisite for the design of a composite material, as its behavior is most of the times governed by its interfacial properties [3].
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