Quality Control of Polyamides
Applications | 2020 | MetrohmInstrumentation
Quality control of polyamides is essential in industries such as automotive and textiles to ensure material performance and reliability. Conventional laboratory methods for determining viscosity, end-group functionality, and moisture are time-consuming and involve chemical reagents.
This study demonstrates the use of visible-near infrared (Vis-NIR) spectroscopy with a DS2500 Solid Analyzer to simultaneously measure relative viscosity, amine and carboxylic end-group content, and moisture in polyamide pellets in under one minute without sample preparation.
Calibration models showed excellent agreement with reference methods:
Vis-NIR analysis offers:
Potential developments include inline process monitoring, machine learning-driven model improvement, expansion to other polymer systems, and integration into process analytical technology (PAT) frameworks.
Vis-NIR spectroscopy with the DS2500 Solid Analyzer provides a fast, accurate, and chemical-free method for comprehensive quality control of polyamides, significantly reducing analysis time and costs.
Metrohm AG, AN-NIR-060: Quality Control of Polyamides using Vis-NIR Spectroscopy.
NIR Spectroscopy
IndustriesEnergy & Chemicals
ManufacturerMetrohm
Summary
Significance of the Topic
Quality control of polyamides is essential in industries such as automotive and textiles to ensure material performance and reliability. Conventional laboratory methods for determining viscosity, end-group functionality, and moisture are time-consuming and involve chemical reagents.
Objectives and Study Overview
This study demonstrates the use of visible-near infrared (Vis-NIR) spectroscopy with a DS2500 Solid Analyzer to simultaneously measure relative viscosity, amine and carboxylic end-group content, and moisture in polyamide pellets in under one minute without sample preparation.
Methodology and Instrumentation
- DS2500 Solid Analyzer (400–2500 nm) in reflection mode
- DS2500 Large Sample Cup with rotating stage to accommodate pellet heterogeneity
- Vision Air Complete software for data acquisition and model development
Main Results and Discussion
Calibration models showed excellent agreement with reference methods:
- Relative viscosity: R² = 0.986; SEC = 0.046 dl/g; SECV = 0.055 dl/g
- Carboxylic end groups: R² = 0.972; SEC = 6.1 meq/kg; SECV = 11.1 meq/kg
- Amine end groups: R² = 0.981; SEC = 2.5 meq/kg; SECV = 4.1 meq/kg
- Moisture content: R² = 0.991; SEC = 0.041 %; SECV = 0.067 %
Benefits and Practical Applications
Vis-NIR analysis offers:
- Rapid results (< 1 min) compared to 25–110 min for conventional methods
- No solvents or reagents, reducing cost and environmental impact
- Non-destructive measurement suitable for inline or at-line QC
Future Trends and Applications
Potential developments include inline process monitoring, machine learning-driven model improvement, expansion to other polymer systems, and integration into process analytical technology (PAT) frameworks.
Conclusion
Vis-NIR spectroscopy with the DS2500 Solid Analyzer provides a fast, accurate, and chemical-free method for comprehensive quality control of polyamides, significantly reducing analysis time and costs.
References
Metrohm AG, AN-NIR-060: Quality Control of Polyamides using Vis-NIR Spectroscopy.
Content was automatically generated from an orignal PDF document using AI and may contain inaccuracies.
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