| Summary: | 碩士 === 逢甲大學 === 紡織工程所 === 90 === Polyurethane (PU) has already found extensive application in many diversified field. One disadvantage of PU is their poor thermal properties in high tempertature. In order to improve the thermal properties of PU, we incorporated three kinds of chain extender contain Bis(4－Aminophenyl) Sulfone [Bisaminol S]、Bis(4－Hydroxyphenyl) Sulfone [Bisphenol S] and 3,3’,4,4’－Diphenylsulfonetetracarboxylic Dianhydride [DSDA] as chain extender separately. All of three different chain extenders have sulfone group and benzene structures, so as to improve their thermal stability. In this study, PTMG is the soft component. MDI and three different chain extenders are the hard component. There were shown different thermal stability among chain extender. There were made a series of polyurethane within different chain extenders by two steps. Both of traditional polyurethane and ameliorative polyurethane will do a series of tests and analyses.
In our experiment, the formation of copolymer were synthesized successfully. There were not only proved by FTIR and H1 NMR spectroscopy.But also the intrinsic viscosity of ameliorative copolymers had rise obviously. For the thermal properties, the initial degradation temperature of ameliorative copolymers were higher than tradition polyurethane and it showed that the second degradation step increased as the hard segment content. Tgs and Tgh were all higher than traditional polyurethane. For the mechanical properties, the tenacity of ameliorative copolymers were all higher than traditional polyurethane.
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