Accession Number:

AD0656190

Title:

A TECHNICAL PAPER ON THE IRRADIATION INDUCED ELASTIC MEMORY OF POLYMERS.

Descriptive Note:

Technical rept.,

Corporate Author:

RAYCHEM CORP REDWOOD CITY CALIF

Personal Author(s):

Report Date:

1960-01-01

Pagination or Media Count:

11.0

Abstract:

One of the most interesting and novel applications has resulted from a study of the irradiation induced elastic memory of polymers. A typical example is the work that has been done with polyethylene. A most interesting feature of irradiated cross-linked polyethylene is that it behaves as a semi-crystalline polymer below its crystalline melting point, and as a rubber above its crystalline melting point, due to the irradiation induced three-dimensional gel network. It is possible to irradiate cross-link polyethylene in the solid state to form a three-dimensional gel network and then deform i.e. expand or contract polyethylene parts in the molten state. The deformation is accomplished because of the rubber-like extensibility and strength of the polymer when molten. It is then possible to freeze the particular part in the deformed state resulting in a stable configuration due to recrystallization of the polymer. This stable configuration will persist until the polymer is reheated to a temperature above its crystalline melting point, whereupon the polyethylene part will return to its original predetermined dimension. The unique combination of plastic-rubber-like properties permits one to use irradiated polyethylene in many and varied forms where crystalline melting through heat causes the polymer part to return precisely to its original cross-linked geometry. Author

Subject Categories:

  • Plastics
  • Radioactivity, Radioactive Wastes and Fission Products

Distribution Statement:

APPROVED FOR PUBLIC RELEASE