Accession Number:

ADA012207

Title:

Synthesis and Ballistic Evaluation of Selected Transparent Polyurethane Block Copolymers, Part II. Further Changes in Formulation

Descriptive Note:

Final rept.

Corporate Author:

ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA

Report Date:

1975-03-01

Pagination or Media Count:

18.0

Abstract:

In an extension of previous work on polyurethane block copolymers for transparent armor applications, several additional variations of the basic 2,4- toluene diisocyanatepolytetramethylene oxide1,4-butanediol formulation have been investigated. It has been found that excess diisocyanate in a given formulation improves ballistic resistance and that decreasing the amount of polyether soft segment has the same effect. More generally, it has been found that increased sample hardness Shore D parallels improved ballistic performance. High-speed photographic data have shown that these materials continue to absorb large amounts of ballistic energy, with relatively little of this energy manifested as fragment kinetic energy. A technique for the preparation of void-free ballistic test specimens involving the use of a polytetrafluoroethylene mold is also described.

Subject Categories:

  • Polymer Chemistry
  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE