AGING BEHAVIOR OF POLYMERIC MATERIALS FOR SOLAR THERMAL ABSORBER APPLICATIONS
This paper focuses on the description of the aging behavior of selected polymeric materials for solar thermal absorbers. Based on the experiences with the Solanor?all-polymeric collector stagnation temperatures of 140 癈 in air and maximum operating temperatures of 80 癈 in hot water were assumed. Two amorphous polymers including the currently used absorber material Noryl?(a poly(phenylene ether)/polystyrene (PPE+PS) blend) and a semi-crystalline polymeric material were investigated. The purpose of this paper is to analyze the aging behavior of the selected polymers. Therefore extruded specimens were exposed to hot air at 140 癈 and hot water at 80 癈 for various aging times. The aging behavior was characterized by mechanical (monotonic tensile test) and analytical methods (differential scanning calorimetry (DSC), size exclusion chromatography (SEC) and infrared spectroscopy in attenuated total reflection mode (ATR). It was found that ultimate mechanical properties, oxidation temperatures measured by DSC and molecular weight distributions (measured by SEC) are sensitive parameters indicating degradation. In general, the investigated amorphous polymers showed a more significant degradation behavior than the semi-crystalline polymer.
Susanne Kahlen Gernot M.Wallner
Polymer Competence Center Leoben GmbH Parkstrasse 11 A-8700 Leoben, Austria Institute of Materials Science and Testing of Plastics University of Leoben Franz-Josef Strasse 18 A
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）