Comprehensive two-dimensional liquid chromatography for the characterization of functional acrylate polymers

Area of Science:

• Polymer Chemistry
• Analytical Chemistry
• Chromatography

Background:

• Characterizing functional polymers requires simultaneous determination of molar-mass and functionality distributions.
• Traditional methods often struggle to provide comprehensive analysis of complex polymer architectures.
• Poly(methyl methacrylate) (PMMA) is a widely used polymer whose functional variants present analytical challenges.

Purpose of the Study:

• To investigate comprehensive two-dimensional liquid chromatography-size-exclusion chromatography (LC x SEC) for characterizing functional PMMA.
• To develop a simple method for quantifying evaporative light-scattering detection (ELSD) data in LC x SEC.
• To assess the applicability of LC x SEC for determining mutually dependent molar-mass distributions (MMD) and functionality-type distributions (FTD).

Main Methods:

• Utilized two-dimensional liquid chromatography-size-exclusion chromatography (LC x SEC).
• Employed ultraviolet-absorbance and evaporative light-scattering detection (ELSD).
• Developed and applied experimental calibration curves for quantitative ELSD data analysis.

Main Results:

• Demonstrated LC x SEC's capability for qualitative and quantitative analysis of functional PMMA.
• Successfully determined mutually dependent MMD and FTD for representative PMMA samples.
• Observed that critical conditions for retention independence from molar mass varied with polymer end-groups, aligning with theoretical predictions.

Conclusions:

• LC x SEC is a powerful tool for comprehensive characterization of functional polymers like PMMA.
• A straightforward quantification method for ELSD data enhances the utility of LC x SEC.
• Near-critical conditions in LC x SEC are often sufficient for determining coupled MMD and FTD, offering practical advantages.