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|Title:||Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications|
San Sebastián, M.
Silva, Marco Aurélio Pinto
Laza, J. M.
Vilas, J. L.
Barandiarán, J. M.
León, L. M.
High temperature sensor
|Publisher:||IOP Publishing Ltd|
|Journal:||Smart Materials and Structures|
|Citation:||Maceiras, 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.|
|Access:||Restricted access (UMinho)|
|Appears in Collections:||CDF - FCD - Artigos/Papers (with refereeing)|
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