Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites

The article reports on the influence of annealing PVDF in an autoclave process on the PVDF phase composition. DSC, FTIR and XRD measurements serve to observe the phase changes in an already stretched, polarised and β-phase rich film. Annealing was conducted between 90 and 185 <inline-formula>&...

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Autores principales:	Nils Vasic, Julian Steinmetz, Marion Görke, Michael Sinapius, Christian Hühne, Georg Garnweitner
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	pvdf electroactive polymer composite structures Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/07dda8566056480fa04abc47751d3c88
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spelling	oai:doaj.org-article:07dda8566056480fa04abc47751d3c882021-11-25T18:48:07ZPhase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites10.3390/polym132239002073-4360https://doaj.org/article/07dda8566056480fa04abc47751d3c882021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/22/3900https://doaj.org/toc/2073-4360The article reports on the influence of annealing PVDF in an autoclave process on the PVDF phase composition. DSC, FTIR and XRD measurements serve to observe the phase changes in an already stretched, polarised and β-phase rich film. Annealing was conducted between 90 and 185 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi mathvariant="normal">C</mi></mrow></semantics></math></inline-formula> to cover a broad range of curing processes in an autoclave. The β-phase is found to be stable up to near the melting range at 170 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi mathvariant="normal">C</mi></mrow></semantics></math></inline-formula>. At 175 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi mathvariant="normal">C</mi></mrow></semantics></math></inline-formula>, the non-piezoelectric α-phase dominates and the piezoelectric γ- and γ′-phases appear. The γ-phase grows at elevated temperatures and replaces the β-phase. This observation stresses the importance of developing new methods to reactivate the polarisation after annealing, in particular for the integration of PVDF as a sensor in laminated structures, such as CFRP.Nils VasicJulian SteinmetzMarion GörkeMichael SinapiusChristian HühneGeorg GarnweitnerMDPI AGarticlepvdfelectroactive polymercomposite structuresOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3900, p 3900 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pvdf electroactive polymer composite structures Organic chemistry QD241-441
spellingShingle	pvdf electroactive polymer composite structures Organic chemistry QD241-441 Nils Vasic Julian Steinmetz Marion Görke Michael Sinapius Christian Hühne Georg Garnweitner Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites
description	The article reports on the influence of annealing PVDF in an autoclave process on the PVDF phase composition. DSC, FTIR and XRD measurements serve to observe the phase changes in an already stretched, polarised and β-phase rich film. Annealing was conducted between 90 and 185 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi mathvariant="normal">C</mi></mrow></semantics></math></inline-formula> to cover a broad range of curing processes in an autoclave. The β-phase is found to be stable up to near the melting range at 170 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi mathvariant="normal">C</mi></mrow></semantics></math></inline-formula>. At 175 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi mathvariant="normal">C</mi></mrow></semantics></math></inline-formula>, the non-piezoelectric α-phase dominates and the piezoelectric γ- and γ′-phases appear. The γ-phase grows at elevated temperatures and replaces the β-phase. This observation stresses the importance of developing new methods to reactivate the polarisation after annealing, in particular for the integration of PVDF as a sensor in laminated structures, such as CFRP.
format	article
author	Nils Vasic Julian Steinmetz Marion Görke Michael Sinapius Christian Hühne Georg Garnweitner
author_facet	Nils Vasic Julian Steinmetz Marion Görke Michael Sinapius Christian Hühne Georg Garnweitner
author_sort	Nils Vasic
title	Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites
title_short	Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites
title_full	Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites
title_fullStr	Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites
title_full_unstemmed	Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites
title_sort	phase transitions of polarised pvdf films in a standard curing process for composites
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/07dda8566056480fa04abc47751d3c88
work_keys_str_mv	AT nilsvasic phasetransitionsofpolarisedpvdffilmsinastandardcuringprocessforcomposites AT juliansteinmetz phasetransitionsofpolarisedpvdffilmsinastandardcuringprocessforcomposites AT mariongorke phasetransitionsofpolarisedpvdffilmsinastandardcuringprocessforcomposites AT michaelsinapius phasetransitionsofpolarisedpvdffilmsinastandardcuringprocessforcomposites AT christianhuhne phasetransitionsofpolarisedpvdffilmsinastandardcuringprocessforcomposites AT georggarnweitner phasetransitionsofpolarisedpvdffilmsinastandardcuringprocessforcomposites
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Phase Transitions of Polarised PVDF Films in a Standard Curing Process for Composites

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