Preparation of ZnO Nanorods and Shape Memory OBC/PCL/Silicone Blends

• Main Authors: Ting-Yin Lai, 賴亭茵
• Other Authors: Jung-Liang Liu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/brs25c

碩士 === 國立宜蘭大學 === 化學工程與材料工程學系碩士班 === 103 === Zinc oxide synthesized with two different sol-gol methods. Firstly, put zinc nitrate solution (Zn(NO3)2), PEG-b-PPG-b-PEG (poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)) and NH3OH (ammonium hydroxide solution) into a 250 mL beaker, heated to 65 oC until 1/3 solution left. Vigorous stirring was maintained throughout the entire process, and then calcinating the white powder at 600 oC. Secondly, zinc nitrate aqueous solution (Zn(NO3)2) and sodium hydroxide aqueous solution (NaOH) were added into alcohol, and then ethylenediamine (EDTA) was added. After the solution stirred, put into a sonication bath at room temperature for 60 minutes. The solution was dried onder ambient conditions, then washed with water and alcohol, and dried in the air. The morphology of the ZnO was bundle of needle shape. The OBC (olefin block copolymer) was mixed with DCP (dicumyl peroxide), PCL (polycaprolactone), and silicone rubber to form OBC/PCL/silicone blends at 135 oC. The system of OBC/PCL/silicone was fixed at 60/40/20, and the ratio of the reagent A and reagent B of silicone was chosen as 20：1, as the degree of crosslinking and gel content were the most uniform and reproducible. FT-IR curves proved that after silicone added as useful. From the result of SEM (Scanning electron microscope), the etched OBC/PCL/silicone revealed the OBC/PCL domains. The result of DSC (Differential scanning calorimetry) indicated that when the degree of crosslinking increased, the degree of crystallization decreased. The results of DMA (Dynamic mechanical analysis) showed that the Tg of OBC/PCL/silicone 60/40/20 and OBC/PCL 60/40 was -59.2 oC and -49.8 oC, respectively, indicating an increased low temperature flexibility for silicone-filled system. The results of the recovery fixity (Rf) and recovery ratio (Rr) showed limited difference between OBC/PCL 60/40 and OBC/PCL/silicone 60/40/20. The results of TGA (Thermogravimetric analyzer) analysis indicated a significant increase in the thermal stability for silicone-filled system.