Synthesis, Processing, and Performance of a Furan-Based Glycidyl Amine Epoxy Resin

Area of Science:

• Polymer Chemistry
• Organic Synthesis
• Materials Science

Background:

• Epoxy resins are versatile polymers with tunable properties.
• Furan-containing epoxies offer unique reactivity for network formation.
• Controlling synthesis to yield specific epoxy structures is crucial for property optimization.

Purpose of the Study:

• To synthesize and characterize furan diepoxy (FDE) and its α-chlorohydrin derivative.
• To investigate the network formation and thermomechanical properties of cured FDE and α-chlorohydrin FDE.
• To establish a structure-property relationship for these novel epoxy systems.

Main Methods:

• Synthesis of FDE and α-chlorohydrin FDE using furfuryl amine and epichlorohydrin.
• Characterization via gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR).
• Curing studies using differential scanning calorimetry (DSC), FTIR, ¹H and ¹³C NMR, and dynamic mechanical analysis (DMA).

Main Results:

• Simultaneous formation of FDE and α-chlorohydrin FDE during synthesis, with α-chlorohydrin FDE becoming predominant.
• α-chlorohydrin FDE exhibited a higher storage modulus (4.4 GPa vs. 2.9 GPa) and glass transition temperature (129 °C vs. 80 °C) compared to FDE.
• Improved properties of α-chlorohydrin FDE are attributed to additional cross-links formed by furan ring-opening.

Conclusions:

• The synthesis yields a mixture of FDE and α-chlorohydrin FDE, with reaction time influencing product distribution.
• α-chlorohydrin FDE offers significantly enhanced thermomechanical performance over FDE.
• The furan moiety's participation in cross-linking is key to improving the material's properties.