Preliminary Evaluation of the Properties of Dynamically Vulcanised Thermoplastic Rubbers


  1. Van Dyke, J.D.
  2. Gnatowski, M.
  3. Burczyk, A.F.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Polymer Engineering Co Ltd, Burnaby BC (CAN)
The report presents work on five types of dynamically vulcanized thermoplastic rubber blends made from chlorobutyl and nitrile rubbers and polypropylene, nylon 12, and PPT resins. The project objective was to establish a correlation between blend composition and properties such as microstructure swelling index, tensile strength, elongation at break, hardness, and resistance to penetration/reemission of chemical warfare agents. The method of blend preparation and materials testing was described. Results were reviewed and conclusions were drawn. The results confirm that dynamic vulcanization can produce a variety of rubber plastic blends, many with elastomeric properties. Both rubber and plastic phases seems to be affected during the dynamic vulcanization process. Under exposure to solvents, both vulcanized rubber and rubber/plastic blends underwent a rapid approach to equilibrium swelling. It was found that swelling index values of blends were significantly less that the expected “theoretical” values, based strictly on composition in the blend. This was attributed to a caging effect of the thermoplastic phase on the rubber phase at the higher thermoplastic composition. In blends of rubber and thermoplastic, the minimum elongation at break seems to be reached at phase inversion. With respect to re-emission values for the five blends systems studied, from best to worst, the order is PA/CIIR > PP/CIIR > PA/NBR > PP/NBR > PBT/NBR. Selected results were presented during the IUP
Report Number
DRDC-SUFFIELD-CR-2007-240 — Contractor Report
Date of publication
01 Nov 2004
Number of Pages

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