Dynamic Mechanical Behavior of Photo-Cross-linked Shape-Memory Elastomers

Autor:	Jiahui Li, Darcy Chen, Christopher L. Lewis, Mitchell Anthamatten
Rok vydání:	2011
Předmět:	Materials science Polymers and Plastics Organic Chemistry Elastic energy Dynamic mechanical analysis Plateau (mathematics) Elastomer Inorganic Chemistry chemistry.chemical_compound Chemical engineering chemistry Covalent bond Polymer chemistry Materials Chemistry Copolymer Benzophenone Spectroscopy
Zdroj:	Macromolecules. 44:5336-5343
ISSN:	1520-5835 0024-9297
Popis:	Cross-linked elastomers containing reversibly binding side groups are capable of storing elastic energy on multiple time-scales, giving rise to shape-memory and self-healing properties. Photo-cross-linkable benzophenone side groups were incorporated into linear macromers containing reversible (2-ureido-4-pyrimidinone, UPy) side groups. This method enables melt-processing of shape-memory elastomers into complex permanent shapes, and samples can be prepared with much higher UPy-content. UV–vis spectroscopy was applied to study the efficacy of the cross-linking process. Resulting elastomer networks with variable densities of covalent cross-links and reversibly associating side groups were systematically prepared and studied. Dynamic mechanical analysis revealed the presence of two storage modulus plateaus: a high-temperature plateau attributed to covalent cross-links, and a lower temperature plateau attributed to both reversible and covalent cross-links. Results also show that dynamic cross-links behave near...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::029803b3c8a046e4bb1f7777f94541fc https://doi.org/10.1021/ma2004019 Zobrazit plný text záznamu