Accession Number : ADA309562

Title :   Preparation and Characterization of Low DP End-Capped Pyrrone Moldings.

Descriptive Note : Contractor rept. 16 Jun 67-16 Jan 70,

Corporate Author : AVCO CORP LOWELL MA

Personal Author(s) : Hughes, C. T.

PDF Url : ADA309562

Report Date : AUG 1970

Pagination or Media Count : 99

Abstract : Pyrrone polymers were studied to determine their utility as structural molding resins. Because of the problems previously associated with the molding of these resins, a major portion of the work was in a novel synthesis route. This route based on the idea of making short chain fully cyclized precursor molecules which are then chain extended and the newly formed bonds cyclized during the mold cycle. The molding process was studied in considerable detail with over 175 moldings made for physical, mechanical and/or thermal characterization as well as delivery to NASA-Langley. The mechanical properties of the best moldings were exceptional in high temperature properties. Filled moldings were made with particulate fillers including colloidal silica, carbon, graphite, MoS2 powder, and industrial diamonds. Flexural tests were obtained on some of these composites.

Descriptors :   *POLYMERS, *MOLDINGS, TEST AND EVALUATION, MECHANICAL PROPERTIES, SILICON DIOXIDE, STRUCTURAL PROPERTIES, HIGH TEMPERATURE, POLYMERIZATION, DIAMONDS, GRAPHITE, MOLYBDENUM, CARBON, CYCLES, CHAINS, ORGANIC COMPOUNDS, PARTICULATES, COLLOIDS, PLASTICS, FLEXURAL PROPERTIES, SILICIDES, FILLERS, MOLDING TECHNIQUES.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE