By Jinlian Hu
Form reminiscence fabrics are immensely valuable as a result of their strength to recuperate their unique shapes upon publicity to an exterior stimulus resembling warmth, moisture, mild or a magnetic box. This booklet reports key fresh study match reminiscence polymers, their houses and purposes. themes comprise the connection among morphological buildings and form reminiscence homes; excessive functionality Tg and Tm style form reminiscence polymers; buildings 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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Extra resources for Advances in shape memory polymers
Wrue, M. , Anthamatten, M. (2007), Shape-memory effects in polymer networks containing reversibly associating side-groups, Adv. , 19, 2851–5. Li, W. , Ding, E. Y. (2007), Preparation and characterization of cross-linking PEG/MDI/ PE copolymer as solid–solid phase change heat storage material, Solar Energy Materials & Solar Cells, 91, 764–8. , Rogers, C. A. (1997), One-dimensional thermomechanical constitutive relations for shape memory materials, J. Intel. Mat. Syst. , 8, 285–302. , Rogers, C.
Since their Tg can be improved to above the ambient temperature, many polyols with low Mn are also used for the Tg-type SMPU, such as PBAG with Mn of 600, and PTMG with Mn of 250 or 650. % in the PBA600-based SMPU. % in the PTMG650-based SMPU. It seems that the polyols with higher Mn need higher HSC. Hence, an SMPU of desired Ttrans can be synthesized by controlling the SSL and HSC. Shape memory properties of SMPU are adjustable by controlling the SSLs and HSCs. In the Tm-type SMPU, as the SSL increases, the Xc of the soft segment will increase.
9 Demonstration of the effect of hard phase morphology on shape recovery. polyurethanes at the recovery temperature Trec = Tm + 20°C. 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.