The effect of the type and the concentration of polyol and isocyanate on the physical properties of hydrophilic polyurethane foam

• Main Authors: CHEN,WEI-TA, 陳威達
• Other Authors: 張有義
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/87412163014145845397

碩士 === 東海大學 === 化學工程與材料工程學系 === 102 === The conventional Polyurethane foam (PU Foam) appears hydrophobic and the water affinity is therefore poor. This thesis investigates the polymerization reaction at room temperature when different compositions of MDI (NCO=20%) was reacted with polyether polyol. Methods adopted for analyzing the present PU Foam 1. Used SEM(Scanning Electron Microscope) to observe the PU Foam’s pore size and internal structure 2. Used TGA(Thermogravimetric Analysis) to analyze thermal decomposition temperature(Td) and dehydration rate of the PU Foam. 3. Testing the PU Foam's hardness 4. Used the Instron to test the mechanical properties of the PU Foam. 5. Used DMA(Dynamic Mechanical Analyzer) to analyze the glass transition temperature of the PU Foam. From the results of the experimental results, we find that when two types of polyether polyol react with MDI (NCO=20%), the number of the close-type pore is less than that of using one type polyether polyol. Then, when more MDI (NCO=20%) was added, in addition both the Tg (Glass transition temperature) and modulus swelled up, and more pores were formatted which caused a faster dehydration rate. Finally, from the results of TGA analysis, we find that the PU foam’s Td is only affected by the amount of MDI used, not affected by the amount of polyether polyol used.