Tough, Shape-Changing Materials: Crystallized Liquid Crystal Elastomers
| Autor: | Cameron D. Lee, Hyun Kim, Taylor H. Ware, Jennifer M. Boothby, Sarvesh Ramachandran |
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| Rok vydání: | 2017 |
| Předmět: |
Toughness
Shape change Materials science Polymers and Plastics Organic Chemistry Isotropy Liquid crystal elastomer 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Elastomer 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallinity Polymerization Liquid crystal Materials Chemistry Composite material 0210 nano-technology |
| Zdroj: | Macromolecules. 50:4267-4275 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b00567 |
| Popis: | Approaches for the synthesis and processing of responsive materials that combine robust mechanical properties and the ability to undergo shape change in response to a stimulus are of intense interest. Here, we report an approach to integrate these properties by synthesizing liquid crystal elastomers (LCEs) that can be aligned and subsequently crystallized. We polymerize LCEs in the isotropic and nematic states and characterize the resulting actuation and mechanical properties. After polymerization, each of these materials can be reversibly crystallized. By crystallizing LCEs, we demonstrate stiffer and tougher shape changing materials. Notably, crystallized samples exhibit moduli 2 orders of magnitude higher and toughness 5 times higher than nematic elastomers. Heating melts the crystallinity and then induces shape change via melting of the liquid crystalline phase. These LCEs are capable of high load bearing during actuation, up to 1.3 MPa, and high work capacity, up to 730 kJ/m3. These aligned and cryst... |
| Databáze: | OpenAIRE |
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