Degradation by Other Forms of Radiation

Wypych, George

doi:10.1016/b978-1-895198-85-0.50009-1

Cited by 1 publication

(2 citation statements)

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“…It is well-known that polymers form polyenes (compounds with conjugated double bonds) during thermal, photochemical, and chemical degradation . However, the formation of conjugated bonds during laser ablation is fundamentally different from other degradation methods, namely thermal and UV . At first, the PVC sample undergoes a homolytic scission during the exposure of the IR laser beam (Figure ).…”

Section: Resultsmentioning

confidence: 99%

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Colored Poly(vinyl chloride) by Femtosecond Laser Machining

Ahmmed

Mafi

Kietzig

2018

Ind. Eng. Chem. Res.

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Colored poly(vinyl chloride) (PVC) was fabricated by femtosecond laser micromachining without the addition of chemical colorants, eliminating the concern of leaching dyes and pigments. We determined that the changes in surface chemistry and surface topography both contribute to the observed yellow, brown, and black color formation. X-ray photoelectron spectroscopy (XPS) on the machined samples showed that conjugated double bonds are liable for the yellow and brown colors, whereas the presence of oxidized carbon and surface topography contribute to the black color. Fourier transform infrared spectroscopy (FTIR) indicated that laser irradiation altered the material’s properties only near the surface, which left the bulk properties unaltered. Furthermore, chemical resistance tests showed that some of the samples were able to withstand the influence of aggressive chemicals and their color did not fade. Finally, we showed that the fabrication of colored PVC highly depends on its ablation energy threshold which is affected by the laser pulse duration and wavelength.

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Section: Resultsmentioning

confidence: 99%

“…28 However, the formation of conjugated bonds during laser ablation is fundamentally different from other degradation methods, namely thermal and UV. 29 At first, the PVC sample undergoes a homolytic scission during the exposure of the IR laser beam (Figure 8).…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%