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Polymers in Electronic Packaging: Introduction to Filler Dispersion Techniques

August 27, 2018 By Jeffrey Gotro 2 Comments

The last several posts have provided details of the rheological properties of highly filled thermoset resins.  Fumed silica was shown to be a very effective rheology modifier when a yield point and shear thinning are required or to control sagging, such as for die attach or coil bond adhesive.  Silica fillers are used extensively to reduce the coefficient of thermal expansion ... [Click to Continue...]

Polymers in Electronic Packaging: Impact of Particle Geometry on Rheological Properties of Highly Filled Compositions

August 20, 2018 By Jeffrey Gotro 1 Comment

In previous posts, the characterization and rheological properties of highly filled systems was discussed.  In particular, the rheological response of epoxies filled with the common thixotrope, fumed silica filler was covered in detail.  Recall that the particle-particle interactions during shearing control to a large extend the viscosity shear rate relationship.  When using ... [Click to Continue...]

Polymers in Electronic Packaging: What is the Thixotropic Index?

August 13, 2018 By Jeffrey Gotro 1 Comment

In a previous post, the concept of thixotropy or the shear-rate and time dependency was introduced.  Thixotropy develops due to the time required to re-build the particle-particle interactions (i.e. re-form the three dimensional particle network).  Unfortunately, for many years, the terms thixotropy and shear thinning were used interchangeably.  Recently, a distinction has been ... [Click to Continue...]

Polymers in Electronic Packaging: Rheology Modifiers Part Three

August 6, 2018 By Jeffrey Gotro 2 Comments

Figure above courtesy of Cabot [1]. The last post the role of fumed silica in developing thixotropy in filled thermosets.  This post will expand on that discussion and provide more insights into the shear thinning and viscosity recovery process. The interesting observation in the recovery experiment is the relatively rapid recovery of structure after shearing.  For the two ... [Click to Continue...]

Polymers in Electronic Packaging: Rheology Modifiers Part Two

July 30, 2018 By Jeffrey Gotro 2 Comments

The last post provided an introduction to the mechanism of rheology modification using fumed silica.  This post will expand on that discussion and provide more insights into the shear thinning and viscosity recovery process. Figure 1. Viscosity as a function of shear stress for a fumed silica filled epoxy resin.  Figure 1 clearly shows the viscosity decreases ... [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

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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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