Fabrication and capacitive sensing performance of acrylate/nickel/polyaniline conductive composite pressure⁃sensitive adhesive

doi:10.19491/j.issn.1001-9278.2024.11.007

Abstract

Abstract:

In this study， the conductive pressure⁃sensitive adhesive was prepared through multiple solution casting. Chain spherical nickel powders （C⁃Ni）， flake nickel powders （F⁃Ni） and polyaniline （PANI） were incorporated as functional fillers into the resultant acrylic type pressure⁃sensitive adhesive （a⁃PSA）. The results indicated that these fillers were asymmetrically distributed in the thickness direction of the conductive pressure⁃sensitive adhesive due to the effect of gravity. This significantly improved the electrical properties of the resultant composite pressure⁃sensitive adhesive. The a⁃PSA/10 wt% C⁃Ni/1 wt% PANI composite adhesive exhibited the highest conductivity of 0.013 S/m. With increasing the PANI content， there was an increase in the response of the capacitance to bending angle and pressure of the composite adhesives. The most sensitive response to bending angle was observed for the composite adhesives containing 1 wt% PANI. At a pressure of 12.5 kPa， the change rate of capacitance of the composite adhesive reached 1.83. Its tensile strength was 2.88 times as much as that of the a⁃PSA， whereas its adhesion strength decreased with an increase in the filler content. The a⁃PSA/10 wt%C⁃Ni/1 wt% PANI composite adhesive exhibited the best comprehensive performance.

Key words: pressure?sensitive composite adhesive, electrical property, capacitive sensing, adhesion characteristics

CLC Number:

TQ320.7

ZHANG Jiahang, MENG Mengmeng, YANG Jiaxin, LI Yun, ZHANG Yang. Fabrication and capacitive sensing performance of acrylate/nickel/polyaniline conductive composite pressure⁃sensitive adhesive[J]. China Plastics, 2024, 38(11): 41-46.

Figures/Tables 10

样品	a⁃PSA/ g	C⁃Ni/ g	F⁃Ni/g	PANI/g
a⁃PSA/10 %C⁃Ni/0.25 %PANI	10	1	—	0.25
a⁃PSA/10 %C⁃Ni/0.5 %PANI	10	1	—	0.50
a⁃PSA/10 %C⁃Ni/1 %PANI	10	1	—	1.00
a⁃PSA/10 %F⁃Ni/0.25 %PANI	10	—	1	0.25
a⁃PSA/10 %F⁃Ni/0.5 %PANI	10	—	1	0.50
a⁃PSA/10 %F⁃Ni/1 %PANI	10	—	1	1.00

Tab.1. Formula of the a⁃PSA/Ni/PANI composite pressure sensitive adhesives

Fig.1. Morphology and structure of the filler and composite pressure⁃sensitive adhesives

Fig.2. Conductivity of the composite pressure⁃sensitive adhesives

Fig.3. Capacitance change rate curves of the composite pressure⁃sensitive adhesives at different bending angle

Fig.4. Capacitance change curves of the composite pressure⁃sensitive adhesives under different pressure

Fig.5. Capacitance change rate curves of the composite pressure⁃sensitive adhesives under different pressure

Fig.6. Hardness of the composite pressure sensitive adhesives

Fig.7. Capacitance change rate curves of the composite pressure⁃sensitive adhesives under repeated pressure application

Fig.8. Adhesion strength of the composite pressure⁃sensitive adhesives

Fig.9. Tensile strength of the composite pressure⁃sensitive adhesives

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