Tuning the polymer thermal conductivity through structural modification induced by MoS₂ bilayers.

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Polymer-MoS2 nanocomposites offer tunable properties for advanced applications.
• Understanding nanoconfinement effects on polymer behavior is crucial for material design.

Purpose of the Study:

• To investigate the thermal conductivity of nanoconfined polymers within MoS2 bilayers.
• To explore the influence of MoS2 interlayer distance and surface charge on polymer thermal properties.

Main Methods:

• Utilized reverse nonequilibrium molecular dynamics (RNEMD) simulations.
• Analyzed structural modifications including chain elongation, alignment, and packing density.
• Quantified the number of hydrogen bonds (HBs) within confined polymer chains.

Main Results:

• Thermal conductivity of polymers is significantly enhanced when confined by MoS2 sheets, especially on charged surfaces.
• MoS2 surfaces induce polymer chain elongation and parallel alignment, leading to denser packing.
• Increased hydrogen bonding and structural ordering cooperatively enhance phonon transport and thermal conductivity.

Conclusions:

• Nanoconfining polymers within MoS2 structures is an effective strategy to improve thermal conductivity.
• The observed enhancement is attributed to combined structural modifications and increased hydrogen bonding.
• These findings provide a pathway for designing high-performance polymer-MoS2 composites for thermal management applications.