Shape memory fibers

Ahir SV, Tajbakhsh AR, Terentjev EM (2006) Self-assembled shape-memory fibers of triblock liquid-crystal polymers. Adv Eunct Mater 16 556... 

Presently, the study of shape memory polyurethane (SMPU) has been widely conducted. For common elastic fibers, the elasticity should be defined as the instant recoverability of the length on release of the deforming stress. The recovery in shape memory fibers is the ability of deformed fibers to recover under external stimulus such as heat or chemicals. In this case, the external stimulus is a must. Figure 3.1 shows the net-points and switches which response to the stimulus (Hu et al., 2012). The elongation of shape memory polymer fiber are a little less than spandex, but mechanical... 

Due to the requirement of exact control of elastic yams in producing fabrics with repeatable stretch recovery and modulus, care should be taken to store the yams as close to the conditions of manufacturing as possible, particularly for spandex. Lycra, and XLA and shape memory fiber. Proper warping for the elastic yams is essential. Uniform tension and draft of yams are suggested for each package. All yam beams should be in an identical set with the same length of yams. 

New elastic fibers like comfort Lycra, XLA, polyester-based bicomponent fiber, and shape memory fibers provide a fit that is more relaxed than traditional spandex (Figure 3.10). Wearers feel less compressive force fighting against their movements in garments made of these fibers and blends than when wearing the same garment made with lower stretch textured yams and common spandex. 

Meng, Q.H. and Hu, J.L. (2008) The influence of heat treatment on properties of shape memory fibers I. CrystaUinity, hydrogen bonding and shape memory effect. Journal of Applied Polymer Science, 109, 2616—2623. 

Smart compression system using shape memory fibers... 

Hu J., Zhu Y., Lu J., Yeung L.Y and Yeung K.W. (2007), Uniqueness of Shape Memory Fibers in Comparison with Existing Man-made Fibers, in The 9th Asian Textile Conference. Federation of Asian Professional Textile Associations. Taiwan. 

Hu J, Zhu Y. and Lu J. (2008), Self Adjustable, Self Repairable Textiles with Shape Memory Fibers US Patent. 

Kaursoin, J., Agrawal, A. K. (2007), Melt spun thermoresponsive shape memory fibers based on polyurethanes Effect of drawing and heat-setting on fiber morphology and properties, J. Appl. Polym. Set, 1(13,2172-82. 

Meng, Q. H., Hu, J. L., Yeung, L. Y. (2007a), An electro-active shape memory fiber by incorporating multi-walled carbon nanotubes. Smart Materials and Structures, 16, 830-6. 

Key words shape memory fiber, shape memory polyurethane, shape memory hollow fiber, shape memory effect. 

T -type shape memory fibers prepared by melt spinning... 

Ahir, S. V., Tajbakhsh, A. R.,Terentjev, E. M. (2006), Self-assembled shape-memory fibers of tri-block liquid-crystal polymers,. Advanced Functional Materials, 16,556-60. Alteheld, A., Feng, Y. K., Kelch, S., Lendlein, A. (2005), Biodegradable, amorphous copolyester-urethane networks having shape-memory properties, Angewandte Chemie - International Edition, 44,1188-92. 

Multi-stimuli responsive shape memory fibers 323... 

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