Preparation and characterization of triple shape memory composite foams
| Autor: | Hossein Birjandi Nejad, R. M. Baker, Patrick T. Mather |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Soft Matter. 10:8066-8074 |
| ISSN: | 1744-6848 1744-683X |
| DOI: | 10.1039/c4sm01379d |
| Popis: | Foams prepared from shape memory polymers (SMPs) offer the potential for low density materials that can be triggered to deploy with a large volume change, unlike their solid counterparts that do so at near-constant volume. While examples of shape memory foams have been reported in the past, they have been limited to dual SMPs: those polymers featuring one switching transition between an arbitrarily programmed shape and a single permanent shape established by constituent crosslinks. Meanwhile, advances by SMP researchers have led to several approaches toward triple- or multi-shape polymers that feature more than one switching phase and thus a multitude of temporary shapes allowing for a complex sequence of shape deployments. Here, we report the design, preparation, and characterization of a triple shape memory polymeric foam that is open cell in nature and features a two phase, crosslinked SMP with a glass transition temperature of one phase at a temperature lower than a melting transition of the second phase. The soft materials were observed to feature high fidelity, repeatable triple shape behavior, characterized in compression and demonstrated for complex deployment by fixing a combination of foam compression and bending. We further explored the wettability of the foams, revealing composition-dependent behavior favorable for future work in biomedical investigations. |
| Databáze: | OpenAIRE |
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