Accession Number : ADA190301
Title : Development of Polymeric Films with Piezoelectrical Properties from Polypeptides; Low, Odd Nylons; or Polyureas.
Descriptive Note : Final rept. 15 Sep 84-14 Jun 87,
Corporate Author : SOUTHERN RESEARCH INST BIRMINGHAM AL
Personal Author(s) : English, James P ; Vanderbilt, David P ; McNeely, Gerald W
PDF Url : ADA190301
Report Date : Sep 1987
Pagination or Media Count : 91
Abstract : A 33-month project was undertaken to study piezoelectricity in low, odd nylons; odd, odd nylons; polyureas; and polypeptides. The commercially available polypeptides poly(L alanine), poly(L valine), and poly(L asparagine) were apparently not of sufficiently high molecular weight to provide usable films for piezoelectric testing. Likewise, the polyureas we synthesized-poly(trimethyleneurea), poly(pentamethyleneurea), and poly(1,2-propylene diisocynate)-were also poor film-forming materials. Consequently, we devoted most of our efforts to synthesizing film-forming nylons. High molecular-weight nylon 5 was prepared via anionic ring-opening polymerization of piperidone. Films of high quality were solvent cast from trifluoroethanol, and these films were poled in the presence and absence of a plasticizer (2-ethyl-1,3-hexanediol). The highest values of the piezoelectric strain (d31) and stress (e31) constants obtained were for plasticized nylon 5-1.3 pC/N and 2.8 mC/m2 respectively. Keywords: Piezoelectricity, Polyamides, Polypeptides, Poly(Amino Acids), Polyureas, Nylon.
Descriptors : *PIEZOELECTRIC MATERIALS, *POLYMERIC FILMS, AMINO ACIDS, ANIONS, MATERIALS, MOLECULAR WEIGHT, NYLON, PEPTIDES, PIEZOELECTRICITY, PLASTICIZERS, POLYMERIZATION, POLYMERS, SYNTHESIS, TEST AND EVALUATION, PIEZOELECTRIC TRANSDUCERS
Subject Categories : Plastics
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE