Development of Removable Visual Impact Indicator or Polymer Composite Materials

Vidinejevs, Sergejs; Bulderberga, Olga; Aniskevich, Andrey

doi:10.5755/j02.ms.27206

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…Thanks to relatively simple manufacturing conditions, the use of microcapsulefilled polymers is advantageous compared to other methods, such as the embedding of sensors or other complicated methods. The reaction on various triggers, like applied force [3,4], elevated temperatures [5], or ultraviolet (UV) light [6] could be integrated into polymers. By this simple approach, smart structures with extended applications could be developed.…”

Section: Introduction mentioning

confidence: 99%

The Effect of UV Exposure on the Service-life of Thermochromic Microcapsules Integrated into the Epoxy Matrix

Bulderberga¹,

Aniskevich²

2022

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The effect of ultraviolet (UV) exposure on the service-life of thermochromic microcapsules integrated into the epoxy matrix was investigated. The microcapsules of the formaldehyde shell contain the core of thermochromic leuco dye. Seven sets of epoxy resin samples filled with concentrations from 0 to 10 wt.% of microcapsules were investigated. The composite samples were exposed to UV for approximately 1000 h. For the quantitative evaluation of colour change under UV, a fast and simple original procedure based on samples’ image treatment was developed. With the exposure time intervals of 50 h, samples were taken out from the UV light chamber to evaluate the exposure effect on their reversible thermochromic ability and mechanical properties. Periodical evaluation of the UV light effect on mechanical properties during the exposure was performed by microhardness tests. Tensile tests of the samples till the fracture were performed every 200 h. The critical time under the exposure of the UV lamp that destroys the reversible thermochromic reaction of the microcapsules was defined as 200 h. At the same time, it has been found that the mechanical properties of the epoxy resin under the same UV source were not strongly affected after 1000 h of irradiance and changed in the frame of ~ 10 %.

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