Real-time correlation of crystallization and segmental order in conjugated polymers

Area of Science:

• Materials Science
• Polymer Chemistry
• Condensed Matter Physics

Background:

• Segmental order in conjugated polymers is crucial for electronic and mechanical properties.
• Crystallization often leads to rigid, brittle domains, hindering precise morphological control.
• Understanding segmental order evolution during crystallization is essential but currently limited.

Purpose of the Study:

• To develop a method for real-time monitoring of segmental order and crystallinity.
• To investigate the relationship between segmental order and polymer crystallinity.
• To provide insights for designing conjugated polymers with tailored optoelectronic and mechanical properties.

Main Methods:

• Utilized stage-type fast scanning calorimetry and micro-Raman spectroscopy.
• Captured specimens with a continuum of polymer percent crystallinity.
• Detected segmental order in real-time during the crystallization process.

Main Results:

• Observed that segmental order degree saturates before maximum crystallinity is reached.
• Demonstrated that this disparity allows for good charge carrier mobility and segmental dynamic mobility.
• Established that optimal segmental order crystallization temperature can be predicted using glass transition (Tg) and melting (Tm) temperatures.

Conclusions:

• Provides fundamental insights into segmental order evolution during conjugated polymer crystallization.
• Highlights a method to achieve high performance by controlling the crystallization process.
• Aids in the rational design of conjugated polymers for specific optoelectronic and mechanical applications.