Studies on Synthesis and Properties of Poly(urethane-co-oxalate)

• Main Authors: yung-fang Shiao, 蕭詠方
• Other Authors: Cheng-Chien Wang
• Format: Others
• Language: zh-TW
• Published: 100
• Online Access: http://ndltd.ncl.edu.tw/handle/90483860697512512496

碩士 === 南台科技大學 === 化學工程與材枓工程系 === 99 === In our studies, we use oxalic acid as the source of the biomass material. The advantages of oxalic acid can benefit the energy saving as well as carbon reduction. In our process, we simulate industrial polyester synthesis process by melt poly-condensation polymerization to prepare polyoxalate. 1,4-CHDM was used to replace EG to prepare polyoxalate (PCOX) in this study. The thermal stability temperature of PCOX can significantly improve from 209 ℃ rise to 309 ℃ from the TGA measurement and the Mw of PCOX is about 5,000(g/mol) from the GPC analysis. Further, MDI was introduced into the PCOX chain to prepare high molecular weight of biomass marerials. Addition 14 wt% MDI could effectively extend the molecular chain to 54,100(g/mol) after GPC dectection. In addition, the result of DSC and POM shown MDI inhibited the crystallization of PCOX. However, added 14 wt% MDI blended with PCOX can improve the toughness of PCOX. The elongation at break and the tensile strength of PCOX is 37.6% and 41.5 Mpa, respectively. The 1,3-POD was used to prepare polyoxalate, the result of DSC shown significantly Tg at -9 ℃. Further, PPOX as the soft segment to prepared PU, the Mw of PU is about 50,000-56,000 (g/mol) from the GPC analysis and the Tg shift to high temperature with increased the hard segment. Further, MDI was introduced into the PPOX chain, the elongation at break and the tensile strength of polyester is 580% and 17 Mpa, respectively.