The Production of Chemically Resistant Thermoplastic Elastomers by the Reactive Extrusion of Polyamide and Butyl Rubber Polymers


  1. Gnatowski, M.
  2. Koutsandreas, A.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Polymer Engineering Co Ltd, Burnaby BC (CAN)
The presented report contains a summary of research work conducted by Polymer Engineering Company Ltd. And Trinity Western University under contract to W7702-8-R706-001/EDM with DRDC Suffield. This work explored the use of nylon/butyl as barrier materials to chemical warfare agents. The project was broken into two distinct sections. In the first part, work was focused on nylon/butyl rubber blends with rubber as a continuous phase. Unsaturated acrylic monomers and maleic anhydride grafted EP rubber were used as additives to promote post moulding radiation vulcanization and improve mechanical properties of the blend, likely by increased density of cross-linking and promotion of a coupling effect with nylon. It was found that this approach to thermoplastic rubber materials limited the storage and heat stability of the blends as seen as a decrease in melt index with increasing heating time. A study of a possible inhibitor to improve stability was only partially successful. The second part of the project focused on blends with nylon as a continuous phase and with butyl rubber most likely dispersed in the form of small particles. The majority of experiments were conducted with the addition of a variety of vulcanizing agents to blends in a process called "dynamic vulcanization". Thermoplastic blends with good mechanical properties and excellent warfare agent resistance were obtained. This method resulted in increased hardness of the material.
Dynamic vulcanization
Report Number
DRDC-SUFFIELD-CR-2003-141 — Contractor Report
Date of publication
01 Nov 2003
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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