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Cutting Edge Technologies (1984) / Chapter Skim
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Exploring the Limits of Polymer Properties: Structural Components From Rigid- and Flexible-Chain Polymers
Pages 109-116

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From page 109...
... The rapid growth in use of polymers and their substitution for other materials has led to the design and evaluation of new polymer products. Short-term polymer tests designed to accelerate degradation have been commonly used.
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From page 110...
... From a positive perspective, this paper first illustrates several recent polymer applications, particularly those in construction and transportation. Among advanced uses for bulk polymer is the Bethlehem Steel Corporation process for making biaxially oriented polypropylene that is tough enough to stop a bullet.
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From page 111...
... MITI and Japanese industry look forward to this development project as a conclusive factor for the revitalization of the fiber industry, now suffering from recession, and for increasing the value-added for polymer products. At present the closest fiber to this third-generation fiber is Du Pont's Aramid (a grade known as "Kevlar-49")
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From page 112...
... In the second category, flexible-chain polymers are converted into highly oriented and chain-extended conformation, with substantially increased tensile moduli, by drawing from dilute flowing solution or from a gel state or by extruding a supercooled melt by solid-state extruding or by drawing below the polymer melting point under controlled conditions. FLEXIBLE-CHAIN POLYMERS New and successful drawing techniques for flexible-chain polymers have been recently developed by workers in several countries—in the United States at the University of Massachusetts and elsewhere, and in Japan.
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From page 113...
... and followed with tensile pulling. RIGID-ROD POLYMERS Carbon and graphitic fibers produced from polymeric precursors exhibit some of the highest performance characteristics of materials available to date.
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From page 114...
... Air Force Office of Scientific Research (Ordered Polymer Research Programed is currently evaluating the nature of novel rigid-rod macromolecules. The University of Massachusetts is playing a major part in this activity.
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From page 115...
... For these reasons, since 1978 the emphasis has centered on its development. PBT is soluble only in strong acids.~4 i5 The viscosity of such solutions passes through a maximum with increasing polymer concentration, indicating formation of a lyotropic liquid crystal phase.
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From page 116...
... 6. Materials for Lightweight Military Combat Vehicles, NMAB-396, National Materials Advisory Board, National Research Council, Washington, D.C., 1982.
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Key Terms

  • polymer science
  • materials advisory
  • national materials
  • draw ratio
  • polymer applications

  • tensile modulus
  • reinforced plastics
  • wholly aromatic
  • practical application
  • polymer research

  • graphitic fibers
  • fiber industry
  • lyotropic liquid
  • tensile moduli
  • fibers produced

  • bruce black
  • produce carbon
  • stable extrudate
  • experimental vehicle
  • metric tons

  • lighter weight
  • military combat
  • maximum modulus
  • fibers possess
  • ltd equipped

  • exceptional mechanical
  • polymer techniques
  • pont kevlar
  • third generation
  • ultradrawn polyethylene


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