by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, Springfield, VA .
Written in English
|Statement||C. Park ... [et al.].|
|Series||ICASE report -- no. 99-53., [NASA contractor report] -- NASA/CR-1999-209833., NASA contractor report -- NASA CR-209833.|
|Contributions||Park, C., Institute for Computer Applications in Science and Engineering.|
|The Physical Object|
Amorphous polyimides containing polar functional groups have been synthesized and investigated for potential use as high temperature piezoelectric sensors. The thermal stability of the piezoelectric effect of one polyimide was evaluated as a function of various curing and poling conditions under dynamic and static thermal ?doi= Get this from a library! Polarization stability of amorphous piezoelectric polyimides. [C Park; Institute for Computer Applications in Science and Engineering.;] Our research focuses in the electric characterization of three piezoelectric amorphous aromatic polyimides, containing CN groups in different number and positions. The piezoelectricity in amorphous polymers is mainly due to the orientation polarization of the molecular dipoles, which is induced by the application of an external electrical field Molecular modeling of the poling of piezoelectric polyimides J.A. Younga,*, B.L. Farmera, J.A. Hinkleyb aDepartment of Materials Science and Engineering, University of Virginia, Charlottesville, VA , USA bMaterials Division, NASA Langley Research Center, Hampton, VA , USA Received 14 October ; accepted 10 June Abstract The computational method described in this paper
The piezoelectric response was improved after corona poling of the ﬁlms. A maximum d 33 modulus value of 16pCN −1 was obtained for the polymide with two cyano groups (poly 2CN). The polarization also showed time and thermal stability up to °C. Additionally, the thermal stability of the amorphous polyimides, (β-CN) The computational method described in this paper allows the calculation of the dielectric relaxation strength of an amorphous polymer based solely upo A series of amorphous polyimides and copolyimides that contained nitrile were obtained by a two-step procedure. The first step consisted of a polycondensation reaction of 4,4’-oxydiphtalic anhydride (ODPA) with one or two aromatic diamines, namely 1,3-Biscyano(3-aminophenoxy)phenoxybenzene (diamine 2CN) and 1,3-Bis(3-aminophenoxy)benzene (diamine 0CN). 23jM/abstract. The use of polyimides in magnetoelectric (ME) nanocomposites was demonstrated for the first time. Magnetoelectric voltage coefficient was measured in a 0–3 nanocomposite film, prepared via in-situ polymerization method, using spherical cobalt ferrite nanoparticles as fillers and an amorphous copolyimide, as ://
Amorphous polyimides containing polar functional groups have been synthesized and investigated for potential use as high temperature piezoelectric sensors. The thermal stability of the & León, L. M. (). Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications. Smart Materials and Structures, 23(10), Resumo(s): A series of amorphous polyimides and copolyimides containing nitrile were obtained by a two-step :// A detailed study has been made of the thermal cure of two polyimides using infrared analysis. Wenpeng Wang, Shihui Han, Effects of hydrotalcites and tris (1-chloropropyl) phosphate on thermal stability, cellular structure and fire resistance of isocyanate-based Polarization Stability of Amorphous Piezoelectric Polyimides, MRS An amorphous piezoelectric polyimide containing polar functional groups has been developed using a combination of experimental and molecular modeling for potential use in high temperature applications. This amorphous polyimide, (β-CN)APB/ODPA, has exhibited good thermal stability and piezoelectric response at temperatures up to ˚?doi=&rep=rep1&type=pdf.