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Rheology of Thermosets Part 5: Non-isothermal Curing

September 15, 2014 By Jeffrey Gotro 1 Comment

In the last post we talked about isothermal cure rheology.  This is a good way to look at the curing time, gelation time, and get an understanding of the viscosity temperature dependence, but most commercial thermoset processing methods are non-isothermal.  Whether it is bulk molding compound (BMC) molding, prepreg lamination for composites, or integrated circuit encapsulation ... [Click to Continue...]

Rheology of Thermosets Part 4: Isothermal Curing

September 8, 2014 By Jeffrey Gotro 1 Comment

Isothermal curing can be investigated nicely using oscillatory parallel plate rheometry.  It is suggested that disposable plates be used to facilitate sample removal from the rheometer at the conclusion of the curing run.  When setting up the rheometer, the strain amplitude needs to be determined.  In most cases, a strain amplitude in the range of 0.1-0.3% is adequate to get ... [Click to Continue...]

Rheology of Thermosets Part 3: Controlled Strain Measurements

September 2, 2014 By Jeffrey Gotro 4 Comments

Thermoset rheological characterization is typically done using controlled strain experiments.  We discussed this in the Dynamic Mechanical posts in the characterization series.  For rheometry, we use a rotational shear geometry so we are reporting the dynamic loss modulus as G” and the dynamic storage modulus as G’.  As discussed in the previous post, the most common geometry ... [Click to Continue...]

Rheology of Thermosets Part 2: Rheometers

August 25, 2014 By Jeffrey Gotro 3 Comments

This post will cover the types of rheological measurements available for characterizing thermosets.  Rheology is important in two aspects of thermoset processing.  The first is during the application or dispensing of the uncured thermoset (for example an highly filled adhesive or coating) and the second is characterizing the viscosity changes during the curing process.  In the ... [Click to Continue...]

Rheology of Thermosets Part 1: Introduction to Rheology Measurements

August 18, 2014 By Jeffrey Gotro 1 Comment

First a few background concepts to get us started.  Rheology is the science of deformation and flow of matter under controlled testing conditions.  Rheological testing is a powerful way to probe the structure-property-processing relationships in many types of polymers.  The viscosity-shear rate profile is important in the processing of thermoplastics (like injection molding and ... [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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