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

Report Date:

1987-09-01

Pagination or Media Count:

91.0

Abstract:

A 33-month project was undertaken to study piezoelectricity in low, odd nylons odd, odd nylons polyureas and polypeptides. The commercially available polypeptides polyL alanine, polyL valine, and polyL asparagine were apparently not of sufficiently high molecular weight to provide usable films for piezoelectric testing. Likewise, the polyureas we synthesized-polytrimethyleneurea, polypentamethyleneurea, and poly1,2-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 pCN and 2.8 mCm2 respectively. Keywords Piezoelectricity, Polyamides, Polypeptides, PolyAmino Acids, Polyureas, Nylon.

Subject Categories:

  • Plastics
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE