Preparation of high-performance transparent glass-fiber reinforced composites based on refractive index-tunable epoxy-functionalized siloxane hybrid matrix

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Fiber reinforced polymer composites (FRPs) are widely utilized in various industrial fields due to their remarkable mechanical properties and low cost fabrication. However, typical FRPs cannot concurrently fulfill optical transparency and high mechanical strength, which are essential for transparent electronics and automotive applications. Here, we report a transparent FRP (GFRH) that exhibits high opto-mechanical properties by incorporating reinforced glass-fibers into refractive index-tunable epoxy-functionalized siloxane hybrid materials. To achieve transparent composites, we precisely control the refractive index of the siloxane matrix by adding an epoxy cross-linkable hardener. We compare the opto-mechanical properties of the GFRP according to various conditions in terms of curing method (thermaland UV-curing), fiber content (from 0 to 25 wt% of matrix), fiber length (from 0.08 to 3 mm), and fiber type (filament mat, glass-fabric, chopped strands glass-fibers, and milled glass). Finally, to obtain high-performance GFRP, we further optimize the composite structure with short fiber (5 wt% of chopped strands glass-fibers) and long fiber (10 layers of glass-fabric). The optimized composite exhibits high optical transparency (80% @ 550 nm) and mechanical properties (251 MPa flexural strength, 9 GPa flexural modulus and 3 H pencil hardness). Our transparent composite has significant potential for the application of FRPs to transparent electronics and automotive devices.
Publisher
ELSEVIER SCI LTD
Issue Date
2021-01
Language
English
Article Type
Article
Citation

COMPOSITES SCIENCE AND TECHNOLOGY, v.201, pp.108527

ISSN
0266-3538
DOI
10.1016/j.compscitech.2020.108527
URI
http://hdl.handle.net/10203/280022
Appears in Collection
MS-Journal Papers(저널논문)
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