How to measure the surface tension of polymer melt?

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Dustin W. Janes

Many methods, often difficult ... such as pendant drop method. Try reviewing some of the methods described in the book

Polymers at Surfaces and Interfaces

By R.A.L. Jones

Amin Shavandi

I know it can be measured by pendant drop shape analysis using e.g. Kruss DSA100S- but not sure of Melt condition. There are other methods here

Chapter 1 Polymer Surface and Interface Characterization Techniques by Manfred Stamm in Polymer Surfaces and Interfaces

https://www.kruss-scientific.com/products/contact-angle/dsa100/drop-shape-analyzer-dsa100/