I need to precisely measure the surface tension of polycaprolactone "melt" for different molecular weights. Does any one know a reliable method?
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
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/
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