Swelling Behaviour of Cured Urea–Formaldehyde Resin Adhesives with Different Formaldehyde to Urea Mole Ratios

What is it about?

This article explained the sol fraction containing in the network of urea-formaldehyde (UF) polymer adhesives. Using method of swelling as well as aid of SEM micro-graphs, the existence of sol fraction including crystal structure was obvious.

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Why is it important?

Sol fraction in the network can influence the behavior of the adhesive.