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UV Curing of Thermosets Part 15: Using UV DSC to Monitor Curing – 2

April 25, 2016 By Jeffrey Gotro 1 Comment

In the previous post the UV DSC experimental set-up was described for several commercially available UV DSC systems.  Image on the left courtesy of Perkin Elmer.  The DSC cell design makes if very easy to irradiate a sample in a DSC pan and also determine the accurate baseline to enable quantitative measurements of the heat of reaction during UV curing.  Let’s first discuss ... [Click to Continue...]

UV Curing of Thermosets Part 14: Using UV DSC to Monitor Curing – 1

April 11, 2016 By Jeffrey Gotro Leave a Comment

In the last few posts, the utility of using a rheometer with a UV exposure accessory was discussed.  The UV rheometer method is very useful for measuring the physical changes during UV exposure, such as how the dynamic loss and storage moduli changed during UV curing.  Monitoring the viscosity as a function of time for various UV exposure doses has important practical uses as ... [Click to Continue...]

UV Curing of Thermosets Part 13: Using UV Rheology to Monitor Curing – 4

April 4, 2016 By Jeffrey Gotro 1 Comment

In the previous post the role of UV intensity at a constant exposure time was shown to have a large impact on the curing kinetics.  As the UV intensity increased, the time to gelation decreased from the faster chemical crosslinking in an acrylate pressure sensitive adhesive.  Additionally, the UV rheometer data also showed that the modulus at the gel point was approximately the ... [Click to Continue...]

UV Curing of Thermosets Part 12: Using UV Rheology to Monitor Curing – 3

March 28, 2016 By Jeffrey Gotro Leave a Comment

In the last post the UV rheometer method was found to be a very sensitive measurement tool for determining the gel point during UV curing.  As seen in the figure on the left, the crossover in the dynamic loss and storage moduli can be precisely determined yielding an approximate measurement of the time to gelation.  The time to gelation is an important parameter in the ... [Click to Continue...]

UV Curing of Thermosets Part 11: Using UV Rheology to Monitor Curing – 2

March 21, 2016 By Jeffrey Gotro 2 Comments

In our last post, the experimental methods for measuring the rheological changes to UV exposure were presented.  This post will discuss the impact of UV exposure on the rheological properties such as the dynamic loss and storage moduli.  The thickness of the sample is important in UV curing.  If the sample is too thick, depending on the polymer/initiator combination, the UV ... [Click to Continue...]

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Polymer Innovation Blog

I’m Dr. Jeff Gotro and welcome to the Polymer Innovation Blog. Over the last 40 years I have been involved in polymer research, along with product and process development. I acquired invaluable experience working for IBM, AlliedSignal, Honeywell, Ablestik Labs (now Henkel) and in multiple consulting projects. In this blog, I (along with some guest contributors) will share our experiences, tips, and “tricks of the trade” to get more out of your innovation efforts and discuss new trends and technical advances in the polymer industry.
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Polymers in Electronic Packaging

polymers in electronic packaging Are you confused about what is electronic packaging? Have you ever wondered what type of polymers and polymer-based composites are used in electronics? Learn More...

Practical Tips for Curing Thermosets

practical tips for curing thermosets Have you ever had a question about the degree of cure or is your part fully cured after processing? Confused about what is gelation or how does vitrification impact thermoset curing? Learn More...

Rheology of Thermosets

rheology of thermosets Have you ever had a question about measuring the rheological properties of thermosets Didn’t know what is the right experimental approach to get the right rheological information? Learn More...

Dielectric Cure Monitoring of Thermosets

Dielectric Cure Monitoring of Thermosets Do you have a need for an in-situ cure monitor for a thermoset process but don’t know where to start? Are you confused about the terminology used in dielectric spectroscopy? Learn More...

Introduction to Biopolymers and Bioplastics

Introduction to Biopolymers and Bioplastics Would you like to know how sustainable are bio-based polymers? Or what is the market size and growth rate for bioplastics? Or have questions about the biomass supply chain? Learn More...

Thermoset Characterization

Thermoset Characterization Have you ever had a question about how to measure a physical property of a thermoset? Confused about what is gelation or how does vitrification impact thermoset curing profiles? Or wondered how to measure the glass transition temperature of an epoxy or polyester composite? Learn More...

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