| Summary: | 碩士 === 萬能科技大學 === 材料科學與工程研究所在職專班 === 103 === Nonpolar-based Plyurethane compared with polyester- and polyether-baesd Polyurethane, generally have superior hydrolytic stability, lower moisture permeability, higher oxidative stability, and improved low temperature. However, those Nonpolar-based Plyurethanes materials exhibit a lower tensile property because it is lack of strain-induced crystallization. In this study, a Nonpolar-based polyurethane copolymer with hydrolytic and thermal stability will be synthesized using of two- step method. The results shown that the tensile strength of the copolymer was improved by the PCL polyol incorporated in the polyurethane copolymer that used PRIPLAST® as the soft segmen. Furthermore, the copolymers have two characteristics of phase transition including the PRIPLAST® and PCL soft segments, and have three stages of degradation, which are associated with the soft and hard segment compositions for the phase transition and degradation.
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