A Comparison Study on Toughening Vinyl Ester Resins Using Different Nanocarbon Materials

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Vinyl ester resins are widely used but can be brittle.
• Enhancing fracture toughness is crucial for many applications.
• Nanocarbon materials offer potential for polymer reinforcement.

Purpose of the Study:

• To evaluate and compare the toughening effects of graphene, graphene oxide (GO), single-walled carbon nanotubes (SWCNTs), and multi-walled carbon nanotubes (MWCNTs) on vinyl ester resins.
• To investigate the influence of these nanocarbon fillers on resin properties.
• To identify optimal nanocarbon additives for improved toughness.

Main Methods:

• Dispersion of four nanocarbon materials (graphene, GO, SWCNTs, MWCNTs) in vinyl ester resin using high-speed stirring and probe sonication.
• Observation of dispersion states via optical microscopy.
• Systematic investigation of viscosity, thermal, tensile, and fracture toughness properties of modified resins.

Main Results:

• Nanocarbon materials enhanced toughening in the order: SWCNTs > GO > MWCNTs > graphene.
• 0.2 wt% graphene addition resulted in 45% and 54% increases in critical stress intensity factor (KIC) and critical strain energy release rate (GIC), respectively.
• No significant changes in glass transition temperatures were observed for any modified resins.

Conclusions:

• Different nanocarbon materials exhibit varying degrees of toughening efficacy in vinyl ester resins.
• SWCNTs and graphene are particularly effective for enhancing fracture toughness.
• This research provides guidance for selecting nanocarbon additives to improve vinyl ester resin toughness.