Rheological and Electrical Study of a Composite Material Based on an Epoxy Polymer Containing Cyclotriphosphazene

Area of Science:

• Materials Science
• Polymer Chemistry
• Composite Materials

Background:

• Epoxy resins like Diglycidyl Ether of Bisphenol A (DGEBA) are versatile polymers.
• Reinforcement of epoxy matrices is crucial for tailoring material properties.
• Cyclotriphosphazene derivatives offer unique structural and functional attributes for composite development.

Purpose of the Study:

• To investigate the effect of hexaglycidyl cyclotriphosphazene (HGCP) reinforcement on DGEBA epoxy composites.
• To characterize the rheological and electrical behavior of DGEBA-HGCP-MDA composite materials.
• To understand the relationship between HGCP content and material properties.

Main Methods:

• Preparation of DGEBA-HGCP-MDA epoxy composites with varying HGCP content (5-10% by weight) via molten state mixing.
• Morphological analysis using Scanning Electron Microscopy (SEM).
• Rheological characterization through small deformation rheology.
• Electrical characterization via capacitance-frequency measurements (1 Hz to 100 KHz) at room temperature.

Main Results:

• Rheological and electrical behaviors are strongly dependent on HGCP concentration in the DGEBA matrix.
• The modulus of elasticity (G') of the epoxy composite directly correlates with the amount of HGCP.
• Capacitance-frequency measurements indicate a distribution of localized states within the band gap of the DGEBA-HGCP blends.

Conclusions:

• HGCP is an effective reinforcing agent for DGEBA epoxy resins, significantly modifying their viscoelastic and electrical properties.
• The study provides insights into the structure-property relationships of DGEBA-HGCP-MDA composites.
• The findings suggest potential applications for these tailored epoxy composites in areas requiring specific electrical and mechanical performance.