Determination of percent glycerol monostearate in polypropylene by infrared spectroscopy Application Note

About this manual

The document outlines a validated analytical method for measuring the percentage of glycerol monostearate (GMS) and chemically identical antistatic additives in polypropylene. The method utilizes the characteristic ester carbonyl band associated with GMS, typically used for process control where the additive package is known.

The procedure involves molding a representative sample into a film or coupon of 0.4 to 0.7 mm thickness and analyzing it using an Agilent Cary 630 FTIR spectrometer equipped with DialPath or TumbllR accessories. The analysis measures absorbance at specific wavenumbers (1739 cm-1 for GMS and 1044 cm-1 for polypropylene) to calculate concentration via a linear regression calibration equation.

What's inside

• Scope
• Summary
• Apparatus
• Calibration
• Procedure
• Sample preparation
• Operating conditions
• Method configuration
• Analysis

Frequently asked questions

What is the valid range for GMS content determination?

The method has been validated over the range of 0.05 to 0.8% GMS content.

Which Agilent accessories are recommended for this analysis?

The Agilent DialPath or TumbllR accessories are used to insert the film into the infrared beam path.

What is the required resolution for the spectrum?

The film should be analyzed at 4 wavenumber resolution or better.