Preparation and characterization of waterborne Polyurethane with fumed silica composites

• Main Authors: CyongWun- Jhang, 張瓊文
• Other Authors: 段葉芳
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/z9hv87

碩士 === 國立臺北科技大學 === 化學工程研究所 === 101 === Segmented Polyurethane is a kind of block copolymer. From the structure , we could separated into two parts, the soft property and hard property .The soft property of polyurethane is built up by the soft part and the hard part of the ploy because of the hydrogen bond results stiffness by Isophorone diisocyanate and chain extender and hydrophobic Fumed Silica. Hence,this class of materials has received wide attention for their synthesis morphology chemical and mechanical properties, and in environmental awareness, the water-based PU is using water to replace volatile solvents dramatically reducing the use of solvents. This paper studies the dispersible polyurethanes were prepared from IPDI、1, 4-BDA、DMPA with different polyol compound types of PTMEG、PCDL and followed by adding different content hydrophobic Fumed Silica prepare WPU/silica hybrids. The hybrid was characterized by using Fourier-Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance Spectroscopy (NMR) was used to identify the chemical structure of polyurethane. The thermal properties were investigated using Thermogravimetric Analysis and Differential Scanning Calorimetry. The effect of hydrophobic Fumed Silica contents was studied on degradation temperature、glass transition temperature and stability. The degradation temperature of hybrid film slightly increasing with hydrophobic Fumed Silica contents and the glass transition temperature of pure WPU glass transition temperature of greater than adding the hydrophobic fumed silica. While the observed molecular weight by gel permeation chromatography (GPC) the degree of polymerization and using contact angle (CA) for the synthesis of the material and the wetting properties of the water. Finally, Scanning Electron Microscope (SEM) examinations hydrophobic films indicated that the Fumed Silica were well dispersed in the matrix.