Synthesis and Shape Memory Property of a MDI Based Liquid Crystalline Polyurethane

Abstract:

Liquid crystalline polyurethanes (LCPU) were prepared from 4,4’-methylenediphenyl diisocyanate (MDI), 1,6-hexanediol (HDO), 2,2-dimethylol propionic acid (DMPA) and polytetramethylene ether glycol (PTMG). The experiments synthesized three liquid crystalline polyurethane films with different soft/hard segment ratio. Chemical and structural characterization of the polyurethanes were investigated by Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, differential scanning calorimeter and polarized microscopy respectively. Swelling rate and shape memory property were tested. The results indicated that the polyurethane with 62% soft segment and large group of carboxyl displayed excellent swelling and shape memory properties, and the shape recovery rate reached 100%. It was found that the crystallinity, thermal stability decreased and the temperature flexibility, water absorption and shape recovery rate increased with the increase of polytetramethylene ether glycol.

• Periodical: Materials Science Forum (Volume 848)
• Pages: 132-139
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.132
• Online since: March 2016
• Authors: Yue Ting Li, Hui Qin Lian, Yan Ou Hu, Lei Zu, Xiu Guo Cui, Yang Liu, Yu Peng Liu, Ben Ze Wu
• Keywords: Liquid Crystalline Polyurethane, Shape Memory, Synthesis

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