Ultrasonic spectroscopy for in situ polymer viscosity characterization

Overview

This innovative solution leverages ultrasonic spectroscopy to enable real-time, non-invasive monitoring of polymer viscosity under industrial processing conditions, such as high pressure and high temperature. Unlike existing methods, this technology provides a versatile approach for in situ characterization, promising to enhance precision and efficiency in polymer processing applications. The technology can be scaled from lab-based setups to industrial scales, offering a novel tool for industries requiring accurate viscosity measurements under challenging conditions.

Technical specifications

Key features:

• Utilizes acoustic wave propagation and attenuation spectroscopy for real-time analysis.
• Capable of measuring longitudinal strain viscoelastic properties, specifically the elastic (G') and loss (G") modulus.
• Employs piezo transducers mounted on nozzle surfaces for precise data collection.
• Designed to operate effectively under high temperature and pressure using tested coupling materials.
• Allows for in-line data collection with a customized extruder nozzle setup.

Validation approach:

• Lab-based apparatus setup with temperature-controlled cells for initial testing.
• Comparative analysis with conventional rheometer measurements for accuracy.
• Off-line molecular weight characterization to correlate acoustic spectra with material properties.

Technology readiness level

Currently at TRL 2, this technology has been conceptually validated and is in the early experimental phase. Future development will focus on apparatus construction, data collection, and method validation with model polymers, moving towards industrial scaling.