Accelerated Weathering Tests of Linseed and Passion Fruit Oil-Based Polyurethanes
Source abstract
Abstract
The accelerated weathering of polyurethanes (PUs) is a process induced by exposure to ultraviolet (UV) radiation, resulting in the breakdown of chemical bonds and consequent changes in the material’s properties. The reason for this phenomenon is the oxidation, by free radicals, of the polymeric structure, caused by the absorption of energy by the chromophores present in it. This paper studies the accelerated weathering of PU foams synthesized by linseed and passion fruit oil (OL and PFO, respectively), prepared with 0.8 and 1.2 [NCO]/[OH] ratios. After weathering, the samples were analyzed by Fourier transform infrared spectroscopy (FTIR), stereomicroscopy, thermogravimetry (TG), and derivative thermogravimetry (DTG). After the accelerated weathering process, changes were observed in the FTIR spectra of the PU samples compared to the spectra of the original PUs, indicating that the process occurred, even if partially. TG/DTG analysis of the photoaged PUs showed that the degradation process had started, as these materials presented lower thermal stability than the original PUs.
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Research context
OpenAlex topics: Polymer composites and self-healing · Lignin and Wood Chemistry · Natural Fiber Reinforced Composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Faculdade do Gama, Universidade de Brasília, Brasília 72444-240, Brazil
Chemistry Department, Georgia Southern University, Statesboro, GA 30458, USA
Departamento de Engenharia, Universidade da Região de Joinville, Joinville 89219-710, Brazil
Instituto de Química, Universidade de Brasília, Brasília 70910-900, Brazil
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