Crystallization and melting behavior of the crystalline soft segment in a shape-memory polyurethane ionomer

2007 ◽  
Vol 107 (1) ◽  
pp. 599-609 ◽  
Author(s):  
Yong Zhu ◽  
Jinlian Hu ◽  
Ka-Fai Choi ◽  
Kwok-Wing Yeung ◽  
Qinghao Meng ◽  
...  
Keyword(s):  
Shape Memory ◽  
Soft Segment ◽  
Melting Behavior ◽  
Crystallization And Melting Behavior ◽  
Shape Memory Polyurethane ◽  
Polyurethane Ionomer

scholarly journals High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment

2012 ◽  
Vol 2 (2) ◽  
pp. 535-548 ◽  
Author(s):  
Manzoor Ahmad ◽  
Bin Xu ◽  
Hendra Purnawali ◽  
Yongqing Fu ◽  
Weimin Huang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Shape Memory ◽  
High Molecular Weight ◽  
High Performance ◽  
Soft Segment ◽  
Shape Memory Polyurethane

Mechanically strong and resilient shape memory polyurethane with hexamethylene diisocyanate as mixing segment

2020 ◽  
pp. 1045389X2096606
Author(s):  
Jayashree Mohanty ◽  
Hema Garg ◽  
Priyanka Gupta ◽  
Ramasamy Alagirusamy ◽  
Bijay P Tripathi ◽  
...  
Keyword(s):  
Shape Memory ◽  
Soft Segment ◽  
Linear Chain ◽  
Maxwell Model ◽  
Hexamethylene Diisocyanate ◽  
Chain Flexibility ◽  
Elongation At Break ◽  
Entropic Elasticity ◽  
Hard Segments ◽  
Shape Memory Polyurethane

Mechanical robustness and flexibility of shape memory polyurethane (SMPU) make them a prominent candidate in various field. However, the shape memory characteristics are hampered due to the lower breaking stress and strain originating from the slippage of hard segments during deformation and entropic elasticity of the segments. Herein, SMPU is synthesised by modification of Polycaprolactone diol (PCL) based soft segment by introducing a linear chain diisocyante, that is hexamethylene diisocyanate (HDI) as the mixing segment and rigid MDI (4,4′-methylene bis-phenyl diisocyanate) as the hard segment. The HDI based soft segment is expected to improve the chain flexibility, and MDI will retain the strength factor. The SMPU is characterised by chemical, structural and thermal analysis. The stress relaxation behaviour of the film was analysed w.r.t time and correlated with recovery studies using the Maxwell model. The thermomechanical conditions are optimised to attain higher shape fixity (SF) and shape recovery (SR) and the SMPU shows maximum SF (60.8%) and SR (97%) at 70°C temperature and 50% strain condition. Also, SMPU shows the tensile strength of 23.4 MPa with elongation at break of nearly 1270%. Thus, the combination of both diisocyanate and soft segments imparts strength and ductility to the SMPU.

Three-dimensional Graphene Coated Shape Memory Polyurethane Foam with Fast Responsive Performance

2021 ◽  
Author(s):  
Tianjiao Wang ◽  
Jun Zhao ◽  
Chuanxin Weng ◽  
Tong Wang ◽  
Yayun Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Practical Applications ◽  
External Stimuli ◽  
Shape Memory Polyurethane

Shape memory polymers (SMPs) that change shapes as designed by external stimuli have become one of the most promising materials as actuators, sensors, and deployable devices. However, their practical applications...

scholarly journals Thermo-mechanical behavior and structure of melt blown shape-memory polyurethane nonwovens

2016 ◽  
Vol 62 ◽  
pp. 545-555 ◽  
Author(s):  
David L. Safranski ◽  
Jennifer M. Boothby ◽  
Cambre N. Kelly ◽  
Kyle Beatty ◽  
Nishant Lakhera ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Shape Memory ◽  
Shape Memory Polyurethane
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