Switching temperature, spectral and radiation transmittance of a novel kind of thermotropic material

To investigate the properties of thermotropic material, Spectral and radiation transmittance and thermally induced switching temperature of a novel kind of thermotropic material developed by a different mixing proportion of hydroxypropyl methyl cellulose (HPMC), Sodium Chloride (NaCl) and pure water were measured. Measurements shows that thermally induced switching temperatures of four samples of such material are between 25 °C ∼40 °C. Radiation transmittance was tested on samples of thermotropic double glazing window, double glazing window and Low-E double glazing window. Results show that thermotropic double-glazed window with the optimum mixing proportion of HPMC, NaCl and pure water of 2∶10∶100 by mass reduces radiation transmittance at fully turbid state by up to 72% and 32%, respectively, compared to the ordinary double-glazed window and Low-E double-glazed window which do not have adjustable radiation transmittance, and its radiation transmittance changed from transparent state to light scattering state is up to 60%.