How polymers lose memory with age
| Autor: | Fabienne Grillard, Patrice Gaillard, Wilfrid Neri, Alexander Korzhenko, Cécile Zakri, Philippe Poulin |
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| Přispěvatelé: | Centre de recherches Paul Pascal (CRPP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Arkema, Arkema (Arkema) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Soft Matter Soft Matter, Royal Society of Chemistry, 2014, 10, pp. 8985-8991. ⟨10.1039/c4sm01320d⟩ |
| ISSN: | 1744-683X 1744-6848 |
| DOI: | 10.1039/c4sm01320d⟩ |
| Popis: | International audience; Uniquely in the world of materials, polymers deformed at high temperature and subsequently quenched atlow temperature, memorize the temperature at which they have been processed. Polymers can evenmemorize multiple temperatures. This temperature memory is reflected by a maximum of residual stressrestored at the temperature of initial processing. It has been speculated that this capability could arisefrom the presence of dynamical heterogeneities in glassy domains of polymers. Processing the materialat a given temperature would result in the selection of certain heterogeneities that participate in thestorage of mechanical stress. Because dynamical heterogeneities are associated with particular relaxationtimes, the temperature memory of polymers should depend on the time, for example, the glasstransition temperature depends on the frequency. The first experimental study of temporal effects onthe temperature memory of polymers is presently reported. It is found that aging at high temperatureshifts the maximum of residual stress towards greater temperatures. The corresponding loss of memoryis explained by the relaxation of dynamical heterogeneities with short characteristic times. The presentresults clarify the origin of the temperature memory and provide insights into their efficient exploitation in applications. |
| Databáze: | OpenAIRE |
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