Download Advances in shape memory polymers by Jinlian Hu PDF

By Jinlian Hu

Form reminiscence fabrics are immensely necessary as a result of their power to get better their unique shapes upon publicity to an exterior stimulus similar to warmth, moisture, gentle or a magnetic box. This e-book reports key fresh examine fit reminiscence polymers, their homes and functions. subject matters comprise the connection among morphological constructions and form reminiscence homes; excessive functionality Tg and Tm variety 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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Porod’s law is given by Eq. 6 One- dimensional correlation function γ 1(r) vs r. where K is the Porod’s law constant. 3] The background corrected intensity is therefore equal to Iobs(q)-IB. 4] where σ is a measure of the interfacial boundary thickness. 7] where φ1 and φ2 refer to the theoretical volume fractions of the soft and hard phase, respectively. 4. It is found that hard domain size generally increases with the increase of HSC. But at the point HSC = 45%, it slightly decreases. This is also due to the discontinuity–continuity transition of hard domains.

Zhou, H. F. (2005), Shape-memory behaviors of sensitizing radiation-cross-linked polycaprolactone with polyfunctional poly(ester acrylate), J. Appl. Polym. , 95, 634. , Hu, J. , Yeung, K. , Fan, H. , Liu, Y. Q. (2006a) Shape memory effect of PU ionomers with ionic groups on hard segments, Chin. J. Polym. , 24, 173–86. , Hu, J. , Yeung, K. , Liu, Y. , Liem, H. M. (2006b), Influence of ionic groups on the crystallization and melting behavior of segmented polyurethane ionomers, J. Appl. Polym. , 100, 4603–13.

The SAXS experimental results of the segmented polyurethanes were therefore mathematically analyzed based on two-phase models. However, for the segmented polyurethanes with a crystalline soft phase, twophase models are not appropriate because at room temperature the segmented polyurethanes contain a great deal of crystallites of soft segments which contribute to X-ray scattering. Hence the morphology of a hard phase cannot be properly derived. In this study, the SAXS tests of the segmented polyurethanes were performed at Tm + 20°C, in order to ensure the complete melt of the crystalline soft phase.

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