Study on degradable characterization of polyurethane blend with degradable materials

• Main Authors: Zong-Ching Lin, 林宗慶
• Other Authors: Wen-Chang Shih
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/41383153799948051413

碩士 === 國立勤益科技大學 === 化工與材料工程系 === 98 === Degradable polymer materials were prepared by two method: the first one was blended thermoplastic polyurethane (TPU) with various contents of polylactic acid (PLA) and polycaprolactone (PCL) of high molecular weight respectively, and then the cellular material were prepared with constant content of microsphere. The second method was performed by prepolymer with various content of low molecular weight of PLA and PCL respectively and a few blowing agent. Besides, degradation rate and mechanism of all materials mentioned above after aging condition were investigated by Universal Testing Machine and ATR-FTIR. The test result with 90℃ and 100RH% condition in this research revealed: (I) TPU blended materials: TPU/PLA blended materials had higher degradation extent in alkaline and neutral condition; TPU/PCL blended materials had higher degradation extent in acidic and neutral condition. (II) Thermosetting PU cellular materials: the physical properties were decreased with PLA content, when the PLA of linear low molecular weight introducing into PU molecular chain of higher crosslinking degree; that the physical properties were increased with PCL content, and most of the tensile retention of samples after degradation condition was decreased to lower than 20% within 14 days. It was speeded up degradation rate due to the auto-catalytic effect, when both of PLA and PCL were introduced into PU molecular chain of lower corsslinking degree. Besides, the tensile retention of these samples after degradation condition was decreased to lower than 20% within 3 days, when PLA content above 10wt%. (III) Ester type TPU cellular materials: the physical properties were increased with the content of degradable materials, and tensile retention was decreasing to lower than 20% with in 7 days, whatever PLA, PCL or both them were introduced. (IV) Ether type TPU cellular materials: the tensile retention of pure TPU and introducing PLA, PCL, both of them after degradation condition for 56 days were decreased to 57%, 32%, 19% and 38% respectively. There are have higher hydrolysis stabilization and hydrophobic of ether type TPU due to non-carbonyl group in structure of itself.