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MATERIALS | TESTING


According to Kadine Mohomed, Thermal


Figure 1: ED-XRF measurements of the level of copper in a polyamide correlate well with actual values across a broad level of concentrations Source: Spectro Analytical Instruments


Product Manager at the firm, the Discovery TMA 450 provides information about the material’s coefficient of linear thermal expansion (CTE), as well as its shrinkage, softening, and glass transition temperatures. Advanced options can be used to obtain viscoelastic properties such as the material’s stiffness, damping properties (tan delta), creep and stress relaxation over extended experimental time. He says the unit is particularly useful for measuring these material properties locally, which is especially useful in manufactured components or assemblies where compatibility of materials is paramount. TA Instruments has also introduced a Rheo-


An X-ray image of pellets inspected using a Purity Concept X system from Sikora Image: Sikora


Concept V) for detecting impurities on and in a pellet. The Purity Concept X uses specially developed X-ray technology that enables it to inspect both natural and coloured pellets for impurities. The Concept X comes with the company’s


Professional Data Analysis Management (PDAM), software tool, which provides a statistical evaluation of detected contamination, sorted by size and frequency, as well as an image gallery of the pellets that have been detected by the optical and colour cameras as well as the X-ray camera. All data is automatically saved and available in MS Excel format, as well as an image file compiled together with information such as time and batch number.


Mechanical moves TA Instruments says its recently introduced Discovery TMA 450 Thermomechanical Analyzer precisely measures dimensional changes of materials from -150 to +1,000°C “with unparalleled sensitivity and reproducibility.” Usable with a wide range of fixtures and options, it handles sample configurations for testing in expansion, compression, flexure and tension modes.


82 COMPOUNDING WORLD | April 2019


Raman Accessory for its Discovery Hybrid Rheometer (DHR) product line. This new addition combines a Raman spectrometer with the DHR to enable simultaneous collection of rheology and Raman spectroscopy data. “This combination allows for direct correlation between flow characteristics and the unique spectroscopic fingerprints of each material, including information about its chemical and morphological structure,” the company says. The accessory integrates with an iXRTM Raman Spectrometer from Thermo Fisher Scientific to provide a turnkey system for spectroscopic investigation of materials.


Compounding demands At PerkinElmer, Aniket PhD, Product Line Leader for Material Characterisation, says advanced testing and analysis solutions for traditional, as well as emerging, materials will play a key part in plastic compounders’ ability to meet increasing requirements and demands for better and more recyclable materials. The company’s FTIR (Fourier Transform Infrared Spectroscopy) instrument and software solutions (including its Spectrum Two and Frontier Spotlight offerings) are well suited for qualitative and quantitative analysis of polymer starting materials, blended compositions, and finished products, he says. Typical applications include identification and characterisation of fillers and additives, understanding of chemical and physical composition of laminates and adhesives, troubleshooting the chemical origin of inclusions, and identifying the orientation of molecules. “Moreover, our thermal instruments such as DSC


(differential scanning calorimetry), TGA (thermogravimetry analysis), and DMA (dynamic mechanical analysis) complement FTIR data by providing comprehensive analysis of melting temperature, crystallinity, stability and purity, as well as analysis of thermo-mechanical properties and viscoelastic behaviour.” Aniket also highlights


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