Engineering

Materials science

Ultimate tensile strength

Polymer

Thermodynamics

Physics

Industrial engineering

Polyoxymethylene

Young's modulus

Production rate

Composite material

Modulus

Atmospheric temperature range

The tensile drawing behaviour of polyoxymethylene has been studied, with particular reference to the production of ultra-high modulus oriented material. The influence of molecular weight and draw temperature, and the comparative effectiveness of single-stage and two-stage drawing processes have also been examined. In addition to the molecular weight range it appears that both draw temperature and drawing rate must be specified within very narrow limits, if ultra-high modulus material is to be produced. It is tentatively suggested that this is because effective high draw requires a suitable coincidence of rate processes involving both the crystalline and non-crystalline regions of the polymer.

Study of the production of ultra-high modulus polyoxymethylene by tensile drawing at high temperatures