Study of Carbonate-based Thermoplastic Polyurethane in Shape Memory Property

• Main Authors: GUO,LI-YIN, 郭俐吟
• Other Authors: RWEI, SYANG-PENG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/fxp5q5

碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 107 === This work is use poly carbonate-ether based polyol (PCE-based) and poly carbonate-based polyol(PCDL) with 4,4-Methylene diphenyl diisocyanate (MDI) and 1,4-Butane diol to synthesis thermoplastic polyurethane (TPU) by one-step method. Use DSC to test thermoplastic polyurethane's glass transition temperature (Tg), and We Observe when CO2 ratio increase in the poly carbonate-ether based polyol and Tg will increase too, when CO2 ratio is 30 % , Tg is 47.8 ℃ and CO2 ratio is 40 %, Tg is 55.0 ℃ and PCDL's Tg is 12.4 ℃ Td,5% of PCE-based TPU is 216.1 ℃, compare with Td,5% PCDL-TPU is 302 ℃. It is known that the thermoplastic polyurethane of PCE has poor thermal stability. After the thermoplastic polyurethane to from film by solvent casting and annealing the film at 80 ℃ with different time, it's observe that PCE that the Tg of PCE increased from 14.6 °C to 59.6 °C with increasing annealing time. because the PCE-Polyol has side methyl group,result in free volume rotation obstacle is high, so the Tg will increase. Another factor is the PCE-polyol include three oxygen atoms that bring six long pairs, and the lone pairs will mutually repel each other and the configuration will be affected. It can be observe from PCDL that bring three oxygen atoms in the structure which will result in Tg increased from -3.6 °C to 5.5 °C. After the thermoplastic polyurethane to from film by solvent casting,and tset shape memory property.It’s fixing ratio is over 97 %,at third round the recovery ratio will over 91 %. Therefore, the film of PCE can be applied to high temperature (50-60 °C) shape memory film, and PCDL can be applied to low temperature (20 °C) shape memory film, and hope to utilized in fabric to form a new composite in the future.