Improved mechanical properties of shape-memory polyurethane block copolymers through the control of the soft-segment arrangement

2004 ◽  
Vol 93 (5) ◽  
pp. 2410-2415 ◽  
Author(s):  
Jae Whan Cho ◽  
Yong Chae Jung ◽  
Yong-Chan Chung ◽  
Byoung Chul Chun
Keyword(s):  
Mechanical Properties ◽  
Block Copolymers ◽  
Shape Memory ◽  
Soft Segment ◽  
Shape Memory Polyurethane

Effect of Block Molecular Weight on the Mechanical Properties of PA1010-b-PEG Segmented Block Copolymers

2012 ◽  
Vol 512-515 ◽  
pp. 2127-2130
Author(s):  
Li Huo ◽  
Cai Xia Dong
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Block Copolymers ◽  
Microphase Separation ◽  
Soft Segment ◽  
Mechanical Measurements ◽  
Wide Range ◽  
Hard Block ◽  
Higher Temperature ◽  
Hard Segments

The mechanical properties were investigated of a series of PA-PEG thermalplastic elastomer based on PA1010 and polytetramethylene glycol (PEG) with varying hard and soft segment content. Dynamic mechanical measurements of these polymers have carried out over a wide range of temperatures. The block copolymers exhibit three peaks, designated as α, β and γ in the tanδ-temperature curve. The α transition shifts to higher temperature with increasing hard block molecular weight. However, at a constant hard molecular weight, the α transition shifts to higher temperature and the damping increases on increasing the soft segment molecular weight. DMA results show that the block copolymers exhibit a microphase separation structure and both soft and hard segments were found to be crystallizable. The degree of phase separation increases with increasing hard block molecular weight.

Electrospun nonwovens of shape-memory polyurethane block copolymers

2005 ◽  
Vol 96 (2) ◽  
pp. 460-465 ◽  
Author(s):  
Dong Il Cha ◽  
Hak Yong Kim ◽  
Keun Hyung Lee ◽  
Yong Chae Jung ◽  
Jae Whan Cho ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Shape Memory ◽  
Shape Memory Polyurethane

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
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