Abstract
Shape memory polymers are attractive for both science and industrial application. In this article, a series of pyridine-containing supramolecular shape memory polyurethanes (Py-SMPUs) with various diphenylmethane diisocyanate-butanediol (MDI-BDO) contents are synthesized from the 1,6-hexamethylene diisocyanate (HDI), N,N-bis(2-hydroxylethyl) isonicotinamide (BINA), BDO, and MDI. Then, they are investigated systematically using FT-IR, DSC, DMA, WAXD, and shape memory testing. The results show that the addition of MDI-BDO segment improves the strength of hydrogen bonding of Py-SMPUs. It promotes the formation of hard domains, but not influences the phase-separation structure, the intensity, and distribution of physical netpoints. In addition, the MDI-BDO segment improves the rubber modulus and drops the energy loss of Py-SMPUs. However, it does not influence the shape memory behaviors which are mainly influenced by the BINA content. If the BINA content is beyond 30 wt%, good shape memory effect can be achieved in the BINA-HDI-BDO-MDI system; and high shape recovery force can be obtained by increasing the MDI-BDO segment.
Original language | English |
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Pages (from-to) | 5294-5304 |
Number of pages | 11 |
Journal | Journal of Materials Science |
Volume | 46 |
Issue number | 15 |
DOIs | |
Publication status | Published - 1 Aug 2011 |
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering