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RISS 인기검색어
- 검색키워드
- 저자 : Jana Novotna (검색결과 2 건)
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Development of Multilayered Nanocomposites for Applications in Personal Protection
Jana Novotna,Vijay Baheti,Blanka Tomkova,Jiri Militky,Jan Novak 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
The aim of the presented research was to study the influence of surface layer material on improvement of impact, dielectric, EMI shielding and sound absorption properties of sandwich composites. The sandwich composite structure consisted of Kevlar or Carbon woven fabric at the surface layer, recycled high loft nonwoven in the center and a mixture of carbon particles/epoxy matrix as a binder to hold the surface layer and core together. The carbon particles were incorporated in epoxy in order to improve failure mechanism and enhance dielectric properties or electromagnetic shielding of sandwich composites. The biggest improvements on impact properties of sandwich composites were obtained when Kevlar fabric was used as surface layer. However, surface layer of carbon fabric was found to provide better dielectric properties and improve EMI shielding of sandwich composites against Kevlar fabric surface layer.
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Rajesh Mishra,Jakub Wiener,Jiri Militky,Michal Petru,Blanka Tomkova,Jana Novotna 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3
In the present study, flax, jute and glass woven fabric samples were developed as reinforcement for compositeswith bio-epoxy resin. Flax fabrics were developed with plain weave, twill weave (different areal densities) and unidirectional(UD) structure. Jute fabrics were woven with three different structures i.e. plain, matt and twill respectively. For comparisonpurpose, glass woven fabric with plain weave and 3D orthogonal weave were used in this study. Static mechanical propertieslike flexural strength and impact resistance were studied. Dynamic mechanical properties were investigated by DMA 40XTRMI equipment.. Thermal conductivity has been studied for all composite samples. It is observed that the static mechanicalproperties of glass fabrics reinforced composites are superior but the flax & jute fabric reinforced composites are moreflexible. The specific flexural strength as well as specific impact strength of the flax & jute fabric reinforced composites arecompetitive. The dynamic mechanical properties are comparable to that of glass fabric reinforced composites. They can beused in relatively lower load bearing applications as they are a sustainable source of materials for bio-composites whichreduce the environmental burden and reduce the manufacturing cost.
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