Photo and oxide ageing of polyamide
М. К. Paktera, А. I. Seredab, V. I. Bratchunc, V. L. Bespalovc, L.А. Gorbanovaa
a Ukrainian Scientific Research Institute of plastic masses
a Company «Netlayn»
c Donbas National Academy of Civil Engineering and Architecture
Annotation: Using the complex of experimental researches methods (the devise artificial weather of IP1-3, machine being under test on axial tension UTS-10 with diagram «tension (?р) construction is deformation (?в)», the method of DSK is a scanning calorimetry (the temperature increasing speed 10/K minute), infra red spectroscopy, electronic microscopy) a photo oxidation ageing of polyamide polymers. It is set that for the initial stabilized and unstabilized polyamide specimens of (before photoamyde ageing) the depence diagram ?-? has three natural areas: the first area is the linear dependence between ? and ?; the second area is the plastic flow; the third area is the brittle destructions of polyamide. While the increasing of light display intensity, that is light quantity H at Н=2,02·106 lk hour both stabilized and non-stabilized PA-6,6 becomes rigid and brittle. It’s essentially, that while polyamide radiation with ultraviolet rays in presence of oxygen of air with temperature of 60°C, the durability of specimens of PA-6,6 increases at first, and then goes down. It has been confirmed that shortly waved U.V. radiation in combination with oxygen of air, the temperature and moisture causes the serious changes in the surface layer. In this case photochemical reaction leading to the brittleness first of all of amorphous areas of polymer, which is the factor of decreasing relative elongation while breaking. It ha been set that the quantity of oxidating products decreases from the surface into the film depth. While the increasing the radiation duration amount of cracks increases in specimens, turning yellow no stabilized polyamide. For PA while radiation action of small wave-length U. V. (<300 нm) the break of chain is dominant between the atoms of carbon and nitrogen. Because of high reaction ability of nitrogen containing end radicals there is formation of amynogroups and the oxide of carbon is emussed.
Keywords: a photo is the oxidizing ageing, polyamide, nonstabilized and stabilized PAS-6,6, radiation of polyamide, Ultra Viole is radiation, temperature, photo chemical reactions.
Pages: 43-52.
Link for citation: Pakter, М. К.; Sereda, А. I.; Bratchun, V. I. [et al.]. Photo and oxide ageing of polyamide. – Text : electronic. – In: Modern Industrial and Civil Construction. – 2009. – Vol. 5, N 1. – Р. 43-52. – URL: https://donnasa.ru/publish_house/journals/spgs/2009-1/06_pakter_sereda_bratchun_bespalov_gorbanova.pdf (date of access: 19.09.2024). (in Russian)
Vol. 5, N 1 (2009)Journal: Modern Industrial and Civil Construction
Publish house: Donbas National Academy of Civil Engineering and Architecture