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TitleSynthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications
Author(s)Maceiras, A.
Martins, P.
San Sebastián, M.
Lasheras, A.
Silva, Marco Aurélio Pinto
Laza, J. M.
Vilas, J. L.
Gutierrez, J.
Lanceros-Méndez, S.
Barandiarán, J. M.
León, L. M.
High temperature sensor
Issue dateOct-2014
PublisherIOP Publishing Ltd
JournalSmart Materials and Structures
CitationMaceiras, A., Martins, P., San Sebastián, M., Lasheras, A., Silva, M., Laza, J. M., ... & León, L. M. (2014). Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications. Smart Materials and Structures, 23(10), 105015.
Abstract(s)A series of amorphous polyimides and copolyimides containing nitrile were obtained by a two-step procedure. The first step consists on a polycondensation reaction of the 4,4’-oxydiphtalic anhydride (ODPA) with one or two aromatic diamines, namely 1,3-Bis-2-cyano-3-(3-aminophenoxy)phenoxybenzene (diamine 2CN) and 1,3-Bis(3-aminophenoxy)benzene (diamine 0CN). In the second step a thermal cyclodehydration converts each poly(amic acid) or copoly(amic acid) into their corresponding polyimide films. The piezoelectric response was improved after corona poling of the films. A maximum d33 modulus value of 16 pC·N-1 was obtained for the polymide with two cyano groups (poly 2CN) Polarization also showed time and thermal stability up to 160°C. Additionally, the thermal stability of the amorphous polyimides, (β-CN)APB/ODPA, was studied by determining the glass transition temperature (Tg) and thermal decomposition, through Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TG), respectively. The high piezoelectric response (1-16 pC·N-1), Tg (160-180ºC) and degradation temperature (315-450ºC) make such polyamides excellent candidates for their use as high temperature sensors.
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AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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