Explosive dissolution and trapping of block copolymer seed crystallites

Area of Science:

• Polymer Science
• Materials Science
• Supramolecular Chemistry

Background:

• Crystallization-driven self-assembly (CDSA) of block copolymers yields complex structures.
• Polymer crystallites are fundamental to CDSA processes.
• Controlling crystallite behavior is key to precise structure formation.

Purpose of the Study:

• To develop a method for observing changes in one-dimensional (1D) polymer crystallite length during annealing.
• To model the dissolution behavior of polymer crystallites in solution.
• To investigate the influence of seed core crystallinity on crystallite dissolution.

Main Methods:

• A trapping technique was employed to monitor 1D polymer crystallite length changes.
• Annealing experiments were conducted at various temperatures in solution.
• A model was developed based on analogies with 1D polymeric micelles and bottle-brush polymers.

Main Results:

• The study successfully tracked length variations in polymer crystallites during annealing.
• A model was established predicting crystallite dissolution to a critical size, independent of annealing temperature.
• A cooperative "explosion" mechanism for crystallite breakdown was identified.
• The distribution of seed core crystallinity was shown to impact crystallite dissolution.

Conclusions:

• The developed trapping technique allows for dynamic observation of polymer crystallites.
• The proposed model accurately describes crystallite dissolution and cooperative breakdown.
• Seed core crystallinity plays a crucial role in the stability and dissolution of polymer crystallites in CDSA.