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laminate samples. PPG and Bayer have supplied samples in which UV-absorbing organic clear coats are applied to PC sheet. Such constructions are used in automotive headlamp applications. If a UV-screening film cannot be thermally bonded to • PC sheet as it is extruded, and/or cannot avoid severe adverse thinning during thermoforming, then clear coats could be applied to thermoformed PC to avoid such damaging effects to the screening agent. Long-term testing and evaluation of these new material samples is under way. 3.2 Absorber Materials Solar manufacturers have recently considered unglazed constructions in which the polymeric absorber is exposed to UV sunlight. Consequently, we have emphasized the effect of UV exposure on mechanical properties of polymer absorbers. One candidate material is metallocene-based multi- density polyethylene (MBMDPE). We have measured mechanical properties of this material as a function of exposure to UV light in our Ci5000 WeatherOmeter. The most sensitive parameter is percent strain at break. A threefold loss in percent strain at break is evident after exposure to a cumulative dose of UV irradiance equivalent to 4 years exposure in Miami, Florida (Fig. 2). As long as a reasonable residual strain at break is retained (i.e., does not drop to near zero), the absorber material is useable. For the length of time tested, MBMDPE seems suitable as an absorber material. Longer term testing and evaluation of MBMDPE is being continued. 200 150 100 50 0 polymeric glazing constructions. (09/06) • Measuring impact strength of candidate glazings and comparing with dynamic mechanical analysis results as a function of photothermal exposure. (09/06) • Continuing long-term testing and evaluation of candidate polymeric absorber materials. (09/06) 5. Major FY 2005 Publications B. Carlsson, K. Möller, S. Brunold, M. Heck, M. Köhl, M. Hall, A. Roos, M. Ghaleb, G. Jorgensen, B. Karlsson, M. Lopes Prates, M. Zinzi, “Assessment of Service Life of Some Passive Solar Thermal Materials,” CEEES 2nd European Weathering Symposium EWS, 24th Colloquium of Danubian Countries on Natural and Artificial Ageing of Polymers, Gothenburg, Sweden, June 15-17, 2005. B. Carlsson, S. Brunold, A. Gombert, M. Heck, M. Köhl, V. Kübler, O. Holk, G. Jorgensen, B. Karlsson, M. L. Prate, K.Möller, M. Brogren, A. Roos, A. Werner, M. Zinzi, and M. Ghaleb, “Study on Durability and Service Lifetime Prediction of some Static Solar Energy Materials,” 10th International Conference on Durability of Building Materials and Components, Lyon, France, 17-20 April 2005. M. Köhl, G. Jorgensen, S. Brunold, B. Carlsson, M. Heck, and K. Möller, “Lifetime Estimation of Polymeric Glazing Materials for Solar Applications,” 10th International Conference on Durability of Building Materials and Components, Lyon, France, 17-20 April 2005. A. Gombert, M. Heck, V. Kübler, M. Köhl, B. Carlsson, K. Möller, S. Brunold , B. Chevalier, M. Zinzi, G. Jorgensen, “Results of Durability Testing of Antireflective Glazing,” 10th International Conference on Durability of Building Materials and Components, Lyon, France, 17-20 April 2005. Solar Thermal R&D Solar Heating and Lighting 4. Planned FY 2006 Activities The most significant activities planned for FY 2006 include: Testing UV stability of new candidate 1 Year 2 Years 3 Years 4 Years in Miami, FL in Miami, FL in Miami, FL in Miami, FL 01234567 Time of Ci5000 Exposure (mo) Fig. 2. Strain at break of MBMDPE as a function of Ci5000 exposure. 137 Strain at Break (%)PDF Image | DOE Solar Energy Technologies Program
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