Polyoxymethylene (POM) integrity resulting from its dependencies on material geometries and processing methodology

Abstract

POM-copolymer bond breaking leads to change depending with respect to processing methodology and material geometries. This paper present the oversights effect on the material integrity due to different geometries and processing methodology. Thermo-analytical methods with reference were used to examine the degradation of thermomechanical while Thermogravimetric Analysis (TGA) was used to judge the thermal stability of sample from its major decomposition temperature. Differential Scanning Calorimetry (DSC) investigation performed to identify the thermal behaviour and thermal properties of materials. The result shown that plastic gear geometries with injection molding at higher tonnage machine more stable thermally rather than resin geometries. Injection plastic gear geometries at low tonnage machine faced major decomposition temperatures at 313.61˚C, 305.76 ˚C and 307.91 ˚C while higher tonnage processing method are fully decomposed at 890˚C, significantly higher compared to low tonnage condition and resin geometries specimen at 398˚C. Chemical composition of plastic gear geometries with injection molding at higher and lower tonnage are compare based on their moisture and VOC content, polymeric material content and the absence of filler. Results of higher moisture and VOC content are report in resin geometries (0.120%) compared to higher tonnage of injection plastic gear geometries which is 1.264%. The higher tonnage of injection plastic gear geometry are less sensitive to thermo-mechanical degradation due to polymer chain length and molecular weight of material properties such as tensile strength, flexural strength, fatigue strength and creep resistance.