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Thermal expansion of semi-crystalline polymers: Anisotropic thermal strain and crystallite orientation

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dc.title Thermal expansion of semi-crystalline polymers: Anisotropic thermal strain and crystallite orientation en
dc.contributor.author Van Dorp Ramakers, Esther Dorothea Victoria
dc.contributor.author Möginger, Bernhard
dc.contributor.author Hausnerová, Berenika
dc.relation.ispartof Polymer
dc.identifier.issn 0032-3861 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2020
utb.relation.volume 191
dc.type article
dc.language.iso en
dc.publisher Elsevier Ltd
dc.identifier.doi 10.1016/j.polymer.2020.122249
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0032386120300914
dc.subject Thermal expansion en
dc.subject Ultimate coefficient of thermal expansion en
dc.subject Modelling en
dc.subject Crystallinity en
dc.subject Lamellae structure en
dc.subject Orientation averaging en
dc.description.abstract Performance demands on injection- and blow-molded parts are steadily increasing. As a dimensional stability depends largely on shrinkage and warpage during/after processing, the process-induced changes should be taken into account in a mold design. To predict shrinkage, this study introduces an approach to model the thermal expansion based on an elementary volume unit cell consisting of stacked crystalline and amorphous layers. Its validation is performed with the help of the thermal expansions of injection- and blow-molded polyethylene parts measured with respect to the process directions by a dynamic mechanical analyzer in a tension mode. Differential scanning calorimetry measurements are carried out to obtain crystallinity as a function of temperature of the PE parts as an input parameter to calculate the thermal expansion. The additional utilization of the phase specific coefficients of thermal expansion (CTE) and Young's moduli taken from literature for the model showed that the measured thermal expansion lies between the calculated ultimate coefficient of thermal expansion. To adjust the ultimate CTE, the process-dependent tilting and rotation angles are fitted, and it seems that relaxation processes at elevated temperatures (which are not considered in the model yet) cause a deviation. Thus, the model yields a good agreement with the measured data up to a temperature of 70 °C. © 2020 Elsevier Ltd en
utb.faculty Faculty of Technology
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1009577
utb.identifier.obdid 43881580
utb.identifier.scopus 2-s2.0-85079229160
utb.identifier.wok 000523300600030
utb.identifier.coden POLMA
utb.source j-scopus
dc.date.accessioned 2020-03-02T12:28:38Z
dc.date.available 2020-03-02T12:28:38Z
dc.description.sponsorship German Ministry of Education and ResearchFederal Ministry of Education & Research (BMBF) [03FH051PX4]; Graduate Institute, Bonn-Rhein-Sieg University of Applied Sciences; Ministry of Education, Youth, and Sports of the Czech Republic - Program NPU I [LO1504]
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Van Dorp Ramakers, Esther Dorothea Victoria
utb.contributor.internalauthor Hausnerová, Berenika
utb.fulltext.affiliation Esther Ramakers-van Dorp a,b, Bernhard Möginger a, Berenika Hausnerova b,c* a Bonn-Rhein-Sieg University of Applied Sciences, von-Liebig-Straße 20, 53359, Rheinbach, Germany b Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, 76001, Zlin, Czech Republic c Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, nam. T.G. Masaryka 5555, 76001, Zlin, Czech Republic * Corresponding author. Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, nam. T.G. Masaryka 5555, 76001, Zlin, Czech Republic. E-mail address: hausnerova@utb.cz (B. Hausnerova).
utb.fulltext.dates Received 28 November 2019 Received in revised form 31 January 2020 Accepted 1 February 2020 Available online 5 February 2020
utb.fulltext.sponsorship This study was supported by the German Ministry of Education and Research . Grant No.: 03FH051PX4 . The author E. R-vD. also thanks the Graduate Institute, Bonn-Rhein-Sieg University of Applied Sciences for supporting this work by granting a scholarship. The author B.H. was supported by the Ministry of Education, Youth, and Sports of the Czech Republic - Program NPU I ( LO1504 ).
utb.wos.affiliation [Ramakers-van Dorp, Esther; Moeginger, Bernhard] Bonn Rhein Sieg Univ Appl Sci, von Liebig Str 20, D-53359 Rheinbach, Germany; [Ramakers-van Dorp, Esther; Hausnerova, Berenika] Tomas Bata Univ Zlin, Fac Technol, Vavreckova 275, Zlin 76001, Czech Republic; [Hausnerova, Berenika] Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Nam TG Masaryka 5555, Zlin 76001, Czech Republic
utb.scopus.affiliation Bonn-Rhein-Sieg University of Applied Sciences, von-Liebig-Straße 20, Rheinbach, 53359, Germany; Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, Zlin, 76001, Czech Republic; Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, nam. T.G. Masaryka 5555, Zlin, 76001, Czech Republic
utb.fulltext.projects 03FH051PX4
utb.fulltext.projects LO1504
utb.fulltext.faculty Faculty of Technology
utb.fulltext.faculty Faculty of Technology
utb.fulltext.faculty University Institute
utb.fulltext.ou Centre of Polymer Systems
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