Accession Number : ADA618612


Title :   Advanced Single-Polymer Nanofiber-Reinforced Composite - Towards Next Generation Ultralight Superstrong/Tough Structural Material


Descriptive Note : Final rept. 15 Aug 2011-15 Apr 2015


Corporate Author : NEBRASKA UNIV LINCOLN DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Dzenis, Yuris ; Cheng, Stephen Z ; Harris, Frank


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a618612.pdf


Report Date : 29 Apr 2015


Pagination or Media Count : 39


Abstract : The goals of this research were to establish feasibility of manufacturing and to evaluate performance of novel continuous polyimide nanofibers and their nanocomposites. The specific objectives were: (1) demonstrate feasibility of fabrication of continuous nanofibers from a range of specially synthesized soluble polyimides; (2) characterize their mechanical behavior and properties; and (3) fabricate and characterize polyimide nanofiber-reinforced composites. Continuous nanofibers were successfully manufactured from several specially designed polyimides and tested in the broad range of diameters. Significant simultaneous improvements in strength and toughness with the reduction of diameter were observed and analyzed. The best nanofibers were as strong as advanced conventional fibers while maintaining higher toughness. It was shown that chemical structure and processing control nanofiber properties and toughness. Polyimide nanofibers were also successfully incorporated into nanocomposites. It was demonstrated that continuous nanofibers may provide unique advantages for future structural nanocomposites.


Descriptors :   *FIBER REINFORCED COMPOSITES , *NANOMATERIALS , *POLYIMIDE RESINS , FABRICATION , MECHANICAL PROPERTIES , NANOMANUFACTURING , PERFORMANCE(ENGINEERING) , STRENGTH(MECHANICS) , STRUCTURAL PROPERTIES , TOUGHNESS


Subject Categories : Laminates and Composite Materials
      Miscellaneous Materials
      Plastics
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE