The search result changed since you submitted your search request. Documents might be displayed in a different sort order.
  • search hit 1 of 32
Back to Result List

Nanostructural changes in crystallizable controlling units determine the temperature-memory of polymers

  • Temperature-memory polymers remember the temperature, where they were deformed recently, enabled by broad thermal transitions. In this study, we explored a series of crosslinked poly[ethylene-co-(vinyl acetate)] networks (cPEVAs) comprising crystallizable polyethylene (PE) controlling units exhibiting a pronounced temperature-memory effect (TME) between 16 and 99 °C related to a broad melting transition (∼100 °C). The nanostructural changes in such cPEVAs during programming and activation of the TME were analyzed via in situ X-ray scattering and specific annealing experiments. Different contributions to the mechanism of memorizing high or low deformation temperatures (Tdeform) were observed in cPEVA, which can be associated to the average PE crystal sizes. At high deformation temperatures (>50 °C), newly formed PE crystals, which are established during cooling when fixing the temporary shape, dominated the TME mechanism. In contrast, at low Tdeform (<50 °C), corresponding to a cold drawing scenario, the deformation led preferably to aTemperature-memory polymers remember the temperature, where they were deformed recently, enabled by broad thermal transitions. In this study, we explored a series of crosslinked poly[ethylene-co-(vinyl acetate)] networks (cPEVAs) comprising crystallizable polyethylene (PE) controlling units exhibiting a pronounced temperature-memory effect (TME) between 16 and 99 °C related to a broad melting transition (∼100 °C). The nanostructural changes in such cPEVAs during programming and activation of the TME were analyzed via in situ X-ray scattering and specific annealing experiments. Different contributions to the mechanism of memorizing high or low deformation temperatures (Tdeform) were observed in cPEVA, which can be associated to the average PE crystal sizes. At high deformation temperatures (>50 °C), newly formed PE crystals, which are established during cooling when fixing the temporary shape, dominated the TME mechanism. In contrast, at low Tdeform (<50 °C), corresponding to a cold drawing scenario, the deformation led preferably to a disruption of existing large crystals into smaller ones, which then fix the temporary shape upon cooling. The observed mechanism of memorizing a deformation temperature might enable the prediction of the TME behavior and the knowledge based design of other TMPs with crystallizable controlling units.show moreshow less

Export metadata

Additional Services

Search Google Scholar Statistics
Metadaten
Author details:Ulrich NöchelGND, Chaganti Srinivasa Reddy, Ke Wang, Jing CuiGND, Ivo Zizak, Marc BehlORCiDGND, Karl KratzORCiD, Andreas LendleinORCiDGND
DOI:https://doi.org/10.1039/c4ta06586g
ISSN:2050-7488
ISSN:2050-7496
Title of parent work (English):Journal of Materials Chemistry A, Materials for energy and sustainability
Publisher:Royal Society of Chemistry
Place of publishing:Cambridge
Publication type:Article
Language:English
Date of first publication:2015/03/03
Publication year:2015
Publishing institution:Universität Potsdam
Release date:2015/09/24
Volume:16
Issue:3
First page:8284
Last Page:8293
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
DDC classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Peer review:Referiert
Publishing method:Open Access
License (English):License LogoCreative Commons - Namensnennung - Nicht-kommerziell - Weitergabe unter gleichen Bedingungen 3.0 Unported
External remark:Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 194
Accept ✔
This website uses technically necessary session cookies. By continuing to use the website, you agree to this. You can find our privacy policy here.