Journal of Fashion Business (패션비즈니스)

The Korean Society of Fashion Business (한국패션비즈니스학회)
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Comparisons of Electrical Conductivity between Polyester/Polyurethane and Nylon/Polyurethane Woven or Knitted Fabrics with Silver Paste Patterns in Elongation-Strain test

폴리에스터/폴리우레탄 및 나일론/폴리우레탄에 은 문양을 입힌 편직물의 신장-변형 시 전기 전도도 비교

  • Kim, Hyejin (Dept. of Fashion Industry, Ewha Womans University) ;
  • Yun, Changsang (Dept. of Fashion Industry, Ewha Womans University) ;
  • Kim, Jongjun (Dept. of Fashion Industry, Ewha Womans University)
  • 김혜진 (이화여자대학교 의류산업학과) ;
  • 윤창상 (이화여자대학교 의류산업학과) ;
  • 김종준 (이화여자대학교 의류산업학과)
  • Received : 2018.11.30
  • Accepted : 2019.01.27
  • Published : 2019.05.30
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Abstract

The objective of this study was to investigate electrical conductivity of fabrics from polyester (PET) and Nylon (N) containing polyurethane (PU), with silver paste patterns screen-stenciled in three directions. The PET/PU and N/PU fabrics knitted or woven were uniaxially strain-recovered up to 22.5% in three times when each change in electrical resistance was simultaneously measured. This study established four variables that complexly affected electrical conductivity of these specimens; fabric structures, components, cover factors, and the percolation of silver particles. The woven or knitted fabric structures did not distinctively cause the changes in electrical resistance, however, the woven fabrics with the diagonal patterns showed their relatively high electrical resistance. The PET/PU fabrics with increasing the PET proportion generally presented the opposite propensity to its electrical conductivity. The changes in electric resistance of the PET/PU 85/15 2/1 twill and double plain fabrics instantaneously responded to the rate of elongation. The PET/PU group exhibited a reverse correlation between its cover factor and electrical resistivity. The highest electrical conductivity of the PET/PU 95/5 interlock fabric, with very few fluctuations, was attributed to the deep percolation of the silver particles that bridged the gaps between one loop and another. On the other hand, the occurrence of the silver cracks along with the elongated direction led to the immeasurably high change in electrical resistance as the strain increased.

Keywords

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Figure 1. Load-Elongation Graphs of the Three Woven Specimens

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Figure 2. Processes of Image Analyses for Surface Roughness Parameters

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Figure 3. Changes in Electrical Resistivity of the Horizontal PK15 and the Vertical PWt15 Pattern during the Tensile Test

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Figure 4. Microscopic Images (x16) of (a) the Original PK15, (b) the Elongated PK15 in the Course Direction, (c)the Original PWt15, and (d) the Elongated PWt15 in the Warp Direction

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Figure 5. Lateral Microscopic Images of (a) the PKint5, (b) the PK15, and (c) the PWt15

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Figure 6. Changes in Electrical Resistance of the PKint5

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Figure 7. Gaps of the PKint5 between Its Each Loop and Silver Paste (a) before the Tensile Test,(b) after Elongated in Wale Direction, and (c) after Elongated in Course Direction

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Figure 8. Comparisons of Electrical Resistance between PET/PU 85/15 Groups (Left) and N/PU 84/16 Woven and 85/15 Knitted Fabrics (Right) during the Tensile Test up to 3 mm Extension

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Figure 9. Comparisons of Relative Changes in Electrical Resistance between PET/PU 85/15 Groups (Left) and N/PU 84/16 Woven and 85/15 Knitted Fabrics (Right) during the Tensile Test up to 3 mm Extension

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Figure 10. Relative Changes in Electrical Resistance of the PET/PU Groups during the Elongation-Strain

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Figure 11. Relative Changes in Electrical Resistance of the N/PU Groups during the Elongation-Strain

Table 1. Characteristics of Specimens

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Table 2. Elastic Recovery of the Three Woven Specimens

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Table 3. Electrical Resistivity and Resistance of Each Directional Pattern of Silver Paste Before, During, and After the Tensile Tests

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Table 4. Averages of the Surface Roughness Lengths and Parameters

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Table 5. Lengths and Widths of the Knit Loops and Gaps

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Table 6. Differences in the Changes in Electrical Resistance between the PET/PU Groups and the N/PU Groups at 40, 94, 121, 175, 262 Seconds

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