IR Imaging of Solid Lubricant Coatings on Concealed/Disjointed Surfaces for Transparent Polymer Delivery Device Applications
Anton J. Walsh,Natalia Rebrova,Steven Darby,Killian J. Barton,Raymond Wolfe,Finbarr Buckley,Liam Lewis,Michael A. P. McAuliffe +7 more
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TLDR
A prototype IR transmission microscope is presented to evaluate micron-level coating coverage of polyurethane and/or polyvinylpyrrolidone on a poly(propylene)-based delivery device and the industrial applicability of the prototype was demonstrated using comparisons with dye stain analysis by estimating water dilution of coating and identifying artifacts in coating, which may indicate machine malfunction.Abstract:
Transparent polymer delivery devices often contain a solid lubricant coating on a stronger bulk polymer. The distribution of lubricant coating must be monitored for device optimisation appraisals and to ensure consistency during mass production. However, coating evaluation is difficult to perform as surfaces are often concealed and/or disjointed. Dye stain analysis, which is destructive and time-consuming, is the current industry standard. We present a prototype IR transmission microscope to evaluate micron-level coating coverage of polyurethane and/or polyvinylpyrrolidone on a poly(propylene)-based delivery device. The device has a common industrial configuration, containing a duct and bevel. Inferred absorption of the coating was used to identify coating coverage and a multivariate analysis was used to remove the effects of absorption and scattering by the bulk. Coverage on concealed and disjointed surfaces was imaged and evaluated from a single camera viewpoint and ≈50 μm defects were detectable. The industrial applicability of the prototype was demonstrated using comparisons with dye stain analysis by estimating water dilution of coating and identifying artifacts in coating, which may indicate machine malfunction. The sensitivity and speed of the IR technique makes it a favourable alternative to the current industry standard.read more
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TL;DR: In this article, the authors discuss the advantages and disadvantages of using FTIR spectroscopy for the analysis of the properties of infrared spectrum and its application in various applications, including the use of Spectral Spectral Library Searching, Spectral Subtraction, and Deconvolution.
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Modern Raman Spectroscopy: A Practical Approach
Ewen Smith,Geoffrey Dent +1 more
TL;DR: In this paper, the authors present a comprehensive overview of Raman Spectroscopy and its application in the field of data processing, including a discussion of the basic theory of RAMAN SPECTROSCOPY.
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Polyurethane types, synthesis and applications – a review
John O. Akindoyo,Mohammad Dalour Hossen Beg,Suriati Ghazali,Muhammad Remanul Islam,Nitthiyah Jeyaratnam,A. R. Yuvaraj +5 more
TL;DR: In this paper, the chemistry, types, and synthesis of polyurethanes (PUs) are discussed, with a specific emphasis on their recyclability and recoverability, and information is provided on the environmental friendliness of the PU.
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Physical Principles of Electron Microscopy
TL;DR: It's coming again, the new collection that this site has, and the favorite physical principles of electron microscopy book is offered as the choice today.