The prediction of the polymers’ long term durability is both necessary for industry and almost impossible on a conceptual point of view. All the approaches proposed by professionals consist; (i) to expose samples in geographical sites where most weather parameters are controlled (irradiance, temperature, humidity, …). In most cases several years are necessary even if some accelerated tests, by increasing irradiance by Fresnel mirrors, are sometimes possible; (ii) to expose samples in laboratory devices with the aim to simulate or to accelerate the photoageing. These instruments, by continuous exposure of samples (nights and days), allow currently to reduce the exposure time to 1 200 and 300 hours respectively, for a climate corresponding roughly at one year in the South of Europe at 45° south exposure.
Today, many industries are asking for higher acceleration factors, the main reasons being : (i) the time needed for the evaluation of a new material, a new color ; it is particularly the case in the car industry even if the acceptable lifetime is usually 8 to 10 years ; Agriculture, Construction /Public Works and many other industrial sectors are also concerned ; (ii) the necessity to ensure quality on very long exposure times (20-25 years) as it is the case in photovoltaïc, eolian, sustained bridges …
The aim of the meeting is to present various approaches of accelerated and ultraaccelerated photoageings with the necessary control of their natural ageing’s relevancy, this being ensured by the physico chemical approach of the ageing according to NF ISO 10640* (2011) largely developped by CNEP.
The meeting is organised by CNEP, ATLAS MTT and RENAULT, however a round table will allow other constructors of devices to participate actively.
* “Plastics: Methodology for assessing photoageing by FTIR and UV-visible spectroscopy”
The event will take place on 16 June 2016, in Aubiere, France.