Development of a morphological-based predictive model for mechanical properties of binary immiscible polymer blends...

Area of Science:

• Materials Science
• Polymer Science
• Mechanical Engineering

Background:

• Predicting mechanical properties of immiscible polymer blends is challenging due to complex phase-separated structures.
• Existing models often do not fully account for the influence of the polymer-polymer interface on material behavior.

Purpose of the Study:

• To develop a morphological-based model for predicting Young's modulus and tensile strength in phase-separated polymer blends.
• To incorporate the effects of interfacial layers and morphological variations into mechanical property predictions.

Main Methods:

• Utilized the geometrical approach of the knotted and interconnected skeleton structural (KISS) model.
• Incorporated morphological variations and percolation thresholds of polymer blend components.
• Assumed a thin interfacial layer to account for polymer/polymer interface effects on mechanical properties.

Main Results:

• The developed model demonstrated reasonable agreement with experimental data for iPP/PA, PP/PET, and LDPE/PP blends.
• Model predictions showed validity when compared against established models for tensile strength and Young's modulus.
• The inclusion of the interfacial region improved compatibility with the actual polymer blend microstructure.

Conclusions:

• The proposed morphological-based model effectively predicts mechanical properties of immiscible polymer blends.
• The model's strength lies in its consideration of interfacial effects and its use of simple mathematical calculations.
• This approach offers a valuable tool for understanding and designing polymer blend materials with desired mechanical performance.