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    <id>61291</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>121</pageFirst>
    <pageLast>133</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Stober Medien GmbH</publisherName>
    <publisherPlace>Eggenstein</publisherPlace>
    <creatingCorporation>Gesellschaft für Umweltsimulation e.V.</creatingCorporation>
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    <title language="eng">Significance of new data pairs for irradiance and (surface) temperature</title>
    <abstract language="eng">There is consent that UV irradiance and temperature at the place of photodegradation are the most important environmental parameters in weathering, along with humidity. This contribution shows how an improvement in the measurement data situation can improve the significance and comparability of outdoor exposures. &#13;
Photooxidative ageing is calculated using sample polymers for which the corresponding modelling data (Exposure Response Functions, ERF) is available. The mean square deviations are estimated, which result from using different spectral irradiances and different spectral sensitivities, both of the sensors and the polymers. It will be shown here how the significance of the irradiance values increases with increasing approximation of the spectral sensitivities of the sensor and polymer. Also, the mean square deviations are estimated, which result from using different activation energies and surface temperatures. A selection of different variables to describe the weathering exposure is created. The potential of either individual values or data pairs is evaluated in terms of significance or correlation to the calculated photooxidative ageing.&#13;
Recording hourly data also enables subsequent evaluations of individual test specimens, adapted to the respective colour or to determine activation energies. An accumulated value, calculated from PIT-radiometer  irradiance and a suited surface temperature, can provide a comparison of different outdoor exposures over different locations or years.&#13;
Thus, a characterisation of the weathering exposure would be related to a reference spectral sensitivity (much closer to a polymer than that of a common UV radiometer), one reference activation energy, and different surface temperature scenarios with, on the one hand, graded solar absorptions (white / grey / black) and, on the other hand, different thermal couplings (coated metal / thick plastic). This results in three values each for plastic samples and coated metals (light / grey / dark). &#13;
It will never be possible to accurately predict the weathering tests for individual samples (with their specific sensitivities), but the proposed approaches can go a long way towards the comparability of outdoor weathering exposures.</abstract>
    <parentTitle language="eng">Natural and artificial Ageing of polymers</parentTitle>
    <identifier type="isbn">978-3-9826129-1-1</identifier>
    <enrichment key="eventName">10th European Weathering Symposium EWS</enrichment>
    <enrichment key="eventPlace">Graz, Austria</enrichment>
    <enrichment key="eventStart">11.09.2024</enrichment>
    <enrichment key="eventEnd">13.09.2024</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Anja Geburtig</author>
    <author>Peter Trubiroha</author>
    <author>Volker Wachtendorf</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Polymer 3R</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Outdoor weathering</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">3 Gefahrgutumschließungen; Energiespeicher</collection>
    <collection role="institutes" number="">3.1 Sicherheit von Gefahrgutverpackungen und Batterien</collection>
    <collection role="institutes" number="">7 Bauwerkssicherheit</collection>
    <collection role="institutes" number="">7.5 Technische Eigenschaften von Polymerwerkstoffen</collection>
    <collection role="themenfelder" number="">Umwelt</collection>
    <collection role="themenfelder" number="">Umwelt-Material-Interaktionen</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
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