Heating-responsive shape-memory effect in thermoplastic polyurethanes with low melt-flow index

• Main Authors: Sun, Li, Huang, Wei Min, Lu, Haibao, Lim, Kok Jiak, Zhou, Ye, Wang, Tao Xi, Gao, Xiang Yang
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Aeronautical engineering::Materials of construction
• Online Access: https://hdl.handle.net/10356/103956; http://hdl.handle.net/10220/24653
• Institution: Nanyang Technological University

The heating-responsive shape-memory effect (SME) based on melting in two thermoplastic polyurethanes (TPUs) with low melt-flow index is experimentally investigated. It is revealed that after severe deformation in either tension or impression at room temperature, upon heating to the melting temperature, significant shape recovery is achieved. The underlying mechanism for the heating-responsive shape recovery (based on melting) in such a type of polymers without crosslinking is proposed. This mechanism is generic and should be applicable to most thermoplastic polymers with a low melt-flow index.