Synthesis and properties of polyurethane microcapsule with PCL-PEG-PCL triblock copolymer

• Main Authors: Kuan-chou Chen, 陳冠州
• Other Authors: Ming- hsiung yen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/5tb6d4

碩士 === 國立臺灣科技大學 === 高分子系 === 94 === In this study, first, we synthesized the triblock ester-ether copolydiol (PCL-PEG-PCL) presenting hydrophilic and hydrophobic properties. Secondary, the polyurethane (PU) microcapsule content Lavender oil is produced by interfacial polycondensation and varied the composition of the triblock ester-ether copolydiol as the soft segment；Namely, change the PEG molecular weight and CL/PEG molar ratio. The different kinds of hard segment are used and varying the NCO/OH molar ratio, Diethlenetriamine (DETA) is employed as the chain extender. We discuss the relationship of the structure physical properties, formation and release properties of the PU microcapsule. The release properties of cotton fabrics treated by PU microcapsule dipping are discussed. The result of the different NCO/OH molar ratio of the PU microcapsule, the highest (7E) has greater particle size, formation properties and slower release. The largest PEG molecular weight (2000 series) has smaller particle size, irregular shape of microcapsule phase separation and faster release caused by greater phase separation. The highest CL/PEG molar ratio and high molecular weight PEG (E2000C4) of the soft segment has bigger particle size better formation and faster release. In addition, within result of the different kinds of hard segment, the aromatic hard segment like TDI and MDI has a slow release speed, a wider particle distribution, rougher microcapsule surfaces and greater thickness of the microcapsule wall than the microcapsule of aliphatic hard segment. The aliphatic PU microcapsule (H12MDI) to form a smooth and thin spherical surfaces process a fast release and has greater crystallization. The result of finish fabrics treated by PU microcapsule show the same release behavior as the microcapsule before adhesion.