Competitive adsorption and threading behavior in cyclic-linear polymer blend films supported on an attractive...

Area of Science:

• Polymer Science
• Materials Science
• Computational Chemistry

Background:

• Cyclic polymers possess unique topological structures, leading to distinct conformational and interfacial properties compared to linear polymers.
• Understanding the behavior of polymer blends, especially those containing cyclic and linear chains, is crucial for developing advanced materials.

Purpose of the Study:

• To investigate the competitive adsorption and chain threading phenomena in cyclic-linear polymer blend films on an attractive substrate.
• To elucidate the influence of cyclic polymer topology, chain threading, and stiffness on interfacial behavior.

Main Methods:

• Utilizing molecular dynamics simulations to model and analyze the adsorption dynamics of cyclic-linear polymer blends.
• Quantifying adsorption preference, chain conformations (radius of gyration), and the impact of stiffness.

Main Results:

• Cyclic polymer chains exhibit preferential adsorption over linear chains due to a lower entropic penalty.
• The mean square radius of gyration for cyclic chains increases with decreasing cyclic fraction, indicating linear chain threading.
• Increased stiffness enhances the adsorption of cyclic chains, leading to flattened, rubber band-like conformations.

Conclusions:

• The study reveals a complex interplay between polymer topology, chain threading, and stiffness in governing interfacial phenomena.
• Findings provide valuable insights for designing functional polymer films with tailored interfacial properties.