Advances in shape memory polymers by Jinlian Hu

By Jinlian Hu

Form reminiscence fabrics are immensely invaluable due to their power to get better their unique shapes upon publicity to an exterior stimulus equivalent to warmth, moisture, mild or a magnetic box. This booklet experiences key fresh learn suit reminiscence polymers, their homes and functions. issues comprise the connection among morphological buildings and form reminiscence homes; excessive functionality Tg and Tm variety form reminiscence polymers; constructions of form reminiscence polymers with supramolecular switches; and the thermally-active and moisture-active form reminiscence influence of supermolecular form reminiscence polymers.

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Peng, Y. (2004), Shape memory of hydrogen-bonded polymer network/poly(ethyleneglycol) complexes, Macromolecules, 37, 2228. , Hu, J. , Lu, J. (2007b), Shape memory behavior of SMPU knitted fabric, Journal of Zhejiang University SCIENCE A, 8, 830–4. , Du, S. 016. , 69, 2064–8. , Wang, D. , Ying, S. K. (1996), Crystallinity and hydrogen bonding of hard segments in segmented poly(urethane urea) copolymers, Polymer, 37, 3577–83. , Wang, D. , Ying, S. K. (1997), Hydrogen-bonding properties of segmented polyether poly(urethane urea) copolymer, Macromolecules, 30, 4405–9.

The effect of the morphological change on shape recovery is demonstrated in Fig. 9. In the evaluation of the SME, thermo-mechanical cyclic tensile tests were extensively employed. This method can provide highly reproducible experimental results. As described previously, the values of shape fixity are obtained in the unloading process. However, we found that if the segmented polyurethanes were continuously kept at Tfix, their shape fixity would decrease gradually after unloading. , 2001). In the present study, the shape fixity of the segmented polyurethanes changing with time after unloading is presented in Fig.

Tirrell, D. A. (2004), Designing materials for biology and medicine, Nature, 428, 487–92. Laroche, F. E. F. , Mantovani, D. (2002), Shape memory materials for biomedical applications, Advanced Engineering Materials, 4, 91–104. Lee, B. , Chun, B. , Sul, K. , Cho, J. W. (2001), Structure and thermomechanical properties of polyurethane block copolymers with shape memory effect, Macromolecules, 34, 6431–7. , Kelch, S. (2002), Shape-memory polymers, Angew. Chem. Int. , 41, 2034–57. , Schmidt, A. , Langer, R.

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