The Application of Polymer/Inorganic Nano-Composites (NCs) for Greenhouse Cladding Material

• Main Authors: Chia-Hsin Liu, 劉佳炘
• Other Authors: Maw-Tien Lee
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/07696491933309000307

碩士 === 國立嘉義大學 === 應用化學系研究所 === 105 === Currently, greenhouse is widely used on cultivation of various crops. However the high temperature of the greenhouse has been a major problem needs to be solved. Therefore developing a possible method to adjust the temperature in the greenhouse is a critical problem. There are many methods to regulate the temperature in the greenhouse such as ventilation, evaporative cooling system, fluid-roof and so on, but these methods have some restrictions. Nearly half of the solar radiation consists of near-infrared (NIR) radiation (700-1100nm) which is a direct source of heat, therefore, many studies were focused on improving covering materials of the greenhouse . Blocking infrared light was one of methods to achieve the cooling effect. Covering materials are mainly divided into three categories: glass, plastic, shielding. The main objective of this study is to improve plastic film of covering materials. The copolymer of PE and Vinyl Acetate (EVA) was chosen as the matrix. Particulates, such as TiO2, ZnO, Fe2O3, metal Al, and pigments, were blended with PE or EVA to produce the composites plastic films. Finally, AFM was used to measure the roughness of the surface of EVA films. The average surface roughness of EVA films was 30-90 nm, within the region of N1-N3 (25-100 nm). It is believed that the light transmittance of these films will not be affected by the roughness of the surface. use UV-VIS spectrometer to observe the reflectance spectra of films and integral area to obtain reflectance. Scanning Electron Microscope (SEM) was applied to observe dispersion of particulates in the EVA matrix. After a series of experiments, we find that metal Al、Fe2O3 and SiO2 are effective in increasing infrared reflectance.