Show simple item record

dc.contributor.authorKrauskopf, Alejandro A.
dc.contributor.authorJiménez, Andrew M.
dc.contributor.authorLewis, Elizabeth A.
dc.contributor.authorVogt, Bryan D.
dc.contributor.authorMüller Sánchez, Alejandro Jesús ORCID
dc.contributor.authorKumar, Sanat K.
dc.date.accessioned2021-02-05T08:36:37Z
dc.date.available2021-02-05T08:36:37Z
dc.date.issued2020-07-21
dc.identifier.citationACS Macro Letters 9(7) : 1007-1012 (2020)es_ES
dc.identifier.issn2161-1653
dc.identifier.urihttp://hdl.handle.net/10810/50050
dc.description.abstractZone annealing, a directional crystallization technique originally used for the purification of semiconductors, is applied here to crystalline polymers. Tight control over the final lamellar orientation and thickness of semicrystalline polymers can be obtained by directionally solidifying the material under optimal conditions. It has previously been postulated by Lovinger and Gryte that, at steady state, the crystal growth rate of a polymer undergoing zone annealing is equal to the velocity at which the sample is drawn through the temperature gradient. These researchers further implied that directional crystallization only occurs below a critical velocity, when crystal growth rate dominates over nucleation. Here, we perform an analysis of small-angle X-ray scattering, differential scanning calorimetry, and cross-polarized optical microscopy of zone-annealed poly(ethylene oxide) to examine these conjectures. Our long period data validate the steady-state ansatz, while an analysis of Herman's orientation function confirms the existence of a transitional region around a critical velocity, v(crit), where there is a coexistence of oriented and isotropic domains. Below v(crit), directional crystallization is achieved, while above v(crit), the mechanism more closely resembles that of conventional isotropic isothermal crystallization.es_ES
dc.description.sponsorshipThis work was supported by grants DE-SC0018182, DE-SC0018135, and DE-SC0018111, funded by the U.S. Department of Energy, Office of Science. A.A.K. acknowledges funding from the Gates Millennium Scholars program under Grant No. OPP1202023 from the Bill & Melinda Gates Foundation. A.J.M. acknowledges funding from the Basque Government through grant IT1309-19. We are grateful to Dr. Andrew J. Lovinger for critically reviewing the manuscript and offering multiple comments that have helped us to significantly improve our paper. We would also like to thank Beatrice Bellini for experimental assistance.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Physical Societyes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/*
dc.subjectpoly(ethylene oxide)es_ES
dc.subjecttemperature-gradientes_ES
dc.subjectmicrostructurees_ES
dc.subjectorientationes_ES
dc.subjectspheruliteses_ES
dc.subjectfilmses_ES
dc.subjectmeltes_ES
dc.subjectpolyethylenees_ES
dc.subjectmorphologyes_ES
dc.subjectkineticses_ES
dc.titleMechanisms of Directional Polymer Crystallizationes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.holderThis is an open access article published under a Creative Commons Attribution (CC-BY)License, which permits unrestricted use, distribution and reproduction in any medium,provided the author and source are cited.es_ES
dc.rights.holderAtribución 3.0 España*
dc.relation.publisherversionhttps://pubs.acs.org/page/rightslinkno.jspes_ES
dc.identifier.doi10.1021/acsmacrolett.0c00346
dc.departamentoesCiencia y tecnología de polímeroses_ES
dc.departamentoeuPolimeroen zientzia eta teknologiaes_ES


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

This is an open access article published under a Creative Commons Attribution (CC-BY)License, which permits unrestricted use, distribution and reproduction in any medium,provided the author and source are cited.
Except where otherwise noted, this item's license is described as This is an open access article published under a Creative Commons Attribution (CC-BY)License, which permits unrestricted use, distribution and reproduction in any medium,provided the author and source are cited.