In this article the correlation between the average molar mass and the melt flow rate (MFR) is achieved. Based on the example of Polyoxymethylene (POM) it is shown that a high average molar mass is associated with a low MFR (high viscosity). On the basis of this dependency, the mechanical properties of static and dynamic tensile strength, elastic modulus, hardness and notched impact strength are investigated.
It was found that the characteristic values of static tensile strength, elastic modulus and hardness increase with increasing MFR (decreasing viscosity). On the other hand the dynamic long-term properties and notched impact strengths decrease with increasing MFR.
Independent publication of the Technical University Chemnitz and the Univeristy of Applied Sciences Darmstadt, Department Mechanical and Plastics Engineering. Author: Prof. Dr.-Ing. Karsten Faust