Study on microcosmic properties and temperature simulation of foamed polypropylene composites

Area of Science:

• Materials Science
• Polymer Engineering
• Manufacturing Processes

Background:

• Foamed polypropylene composites offer unique material properties.
• Understanding the influence of processing parameters like temperature is crucial for optimizing foam structure.
• Existing methods for analyzing foam morphology require detailed experimental and numerical approaches.

Purpose of the Study:

• To investigate and compare the injection molding and compression molding procedures for foamed polypropylene composites.
• To analyze the effect of temperature distribution on the foamed properties of polypropylene composites.
• To determine the optimal processing zones for achieving desired pore diameter and pore density.

Main Methods:

• Experimental analysis of pore diameter, pore density, and microscopic topography using sliced samples.
• Numerical simulation employing the virtual boundary meshfree Galerkin method (VBMGM) with radial basis function interpolation for temperature distribution analysis.
• Comparative study of experimental and numerical temperature data across different zones in both molding procedures.

Main Results:

• Injection molding: Ideal foamed properties observed in zone c, with an average pore diameter of 26.5 µm and pore density of 2.43×10^9 cells·cm⁻³.
• Compression molding: Ideal foamed properties observed in Md zone, with an average pore diameter of 131.2 µm and pore density of 6.3×10^4 cells·cm⁻³.
• Temperature reduction observed from 406.35 K to 311.63 K (injection molding) and 326.35 K to 309.14 K (compression molding) across studied zones.

Conclusions:

• Foamed temperature significantly impacts the properties of foamed polypropylene composites.
• Specific zones in injection and compression molding yield optimal foamed properties, characterized by distinct pore structures.
• The findings provide critical data for advancing the foam molding of polypropylene composites.