Morphogenetic Transition in Weak Gelation of Crystallizable Linear Polymers

Area of Science:

• Polymer Science
• Materials Science
• Physical Chemistry

Background:

• Weak gelation in crystallizable linear polymers typically results in two main textures: fibrillar networks and spherulite assemblies.
• Understanding the kinetic pathways governing polymer crystallization is crucial for controlling material morphology.

Purpose of the Study:

• To investigate the morphogenetic transition between fibrillar networks and spherulite assemblies in polymer weak gelation.
• To elucidate the underlying kinetic mechanisms, specifically the roles of spinodal instability and nucleation metastability.
• To characterize the nature of the observed transition, particularly its potential to exhibit mean-field-like behavior.

Main Methods:

• Analysis of polymer crystallization kinetics.
• Morphological characterization of weak gelation textures.
• Theoretical investigation of phase transition phenomena in polymer systems.

Main Results:

• Identified a morphogenetic transition between fibrillar networks and spherulite assemblies.
• Linked the formation of these textures to the kinetic regimes of spinodal instability and nucleation.
• Observed a spinodal singularity at the transition, indicating mean-field-like mesoscopic phase transition behavior.

Conclusions:

• The formation of distinct polymer textures during weak gelation is kinetically controlled.
• A novel mesoscopic phase transition, characterized by a spinodal singularity, governs the shift between different polymer morphologies.