THERMOTROPIC RESIN SYSTEMS: RELATIONSHIPS BETWEEN FORMULATION PARAMETERS, MATERIAL STRUCTURE AND OPTICAL PROPERTIES
This paper focuses on a comprehensive characterization of various thermotropic resins under polymer physical aspects. Numerous thermotropic layers were produced under systematic variation of resin base, thermotropic additives and additive concentration. A detailed investigation of optical properties, switching temperature, switching process and residual transmittance was performed with a UV/Vis/NIR spectrophotometer. Switching temperatures are compared with thermal transitions in the material determined by Differential Scanning Calorimetry (DSC). Whereas the different film types show a direct solar transparency between 64 and 83％ in the clear state, the direct solar transmittance decreases to values of about 27％ to 80％ above the switching temperature. In general the thermotropic resins are characterized by a steep and rapid switching process. The switching temperature can be adapted by varying the additives. The comparison of films thermal transitions with the switching performance reveals a good correlation.
Katharina Resch Gernot M.Wallner
Polymer Competence Center Leoben GmbH Parkstrasse 11 Leoben 8700, Austria University of Leoben Franz-Josef-Strasse 18 Leoben 8700, Austria
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）