Size-Exclusion Chromatography: A Twenty-First Century Perspective

Area of Science:

• Polymer Science
• Analytical Chemistry
• Materials Science

Background:

• Size-exclusion chromatography (SEC) is a foundational technique in macromolecular science, established for over 50 years.
• It is widely used for determining molar mass averages and distributions in natural and synthetic polymers.

Purpose of the Study:

• To review the extensive applications and advantages of SEC in characterizing macromolecules.
• To address the inherent challenges and potential pitfalls associated with SEC practice.
• To provide an outlook on future directions and expansion opportunities for SEC.

Main Methods:

• SEC coupled with various detectors (e.g., light scattering, viscometry) for comprehensive analysis.
• Application of SEC in determining physicochemical properties beyond molar mass, including branching and chain rigidity.
• Integration of SEC as a second-dimension separation in two-dimensional chromatography for detailed sample analysis.

Main Results:

• SEC accurately determines molar mass averages and distributions for diverse macromolecules.
• SEC characterization extends to branching, chain rigidity, fractal dimension, and heterogeneity.
• Two-dimensional SEC provides combined chemical composition and molar mass distributions.

Conclusions:

• SEC remains the premier method for macromolecular characterization due to its versatility and detector compatibility.
• Awareness of SEC's limitations and careful practice are crucial for reliable results.
• Continued development and application of SEC hold significant potential for advancing polymer science and analysis.