Controlled patterning of crystalline domains by frontal polymerization.

Area of Science:

• Materials Science
• Polymer Chemistry
• Manufacturing

Background:

• Hierarchical materials with combined soft and hard domains exhibit superior properties.
• Current manufacturing methods like 3D printing require complex design and intervention for multiscale architectures.

Purpose of the Study:

• To autonomously fabricate patterned crystalline domains in poly(cyclooctadiene) with multiscale organization.
• To explore a novel rapid, dissipative processing method for advanced material design.

Main Methods:

• Harnessing frontal polymerization spin mode dynamics.
• Utilizing the interplay between reaction kinetics, thermochemistry, and boundary conditions to control domain formation.
• Investigating the impact of initial conditions and front propagation on microstructure.

Main Results:

• Autonomous fabrication of patterned crystalline domains with multiscale organization in poly(cyclooctadiene).
• Formation of amorphous and semi-crystalline domains controlled by internal interfaces and cure front propagation.
• Demonstrated control over domain size, spacing, and arrangement.

Conclusions:

• Frontal polymerization offers a pathway to autonomously create advanced multiscale materials.
• Mechanical properties (strength, elastic modulus, toughness) can be tuned by controlling initial fabrication conditions and front propagation mode.
• This method represents a significant advancement in designing and manufacturing high-performance polymers.