2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/78782In this work we analyze the behavior of Massey products of closed manifolds under the blow-up construction. The results obtained in the article are applied to the problem of constructing closed symplectic non-formal manifolds. The proofs use Thom spaces as an important technical tool. This application of Thom spaces is of conceptual interest.16 pages, amstex, changes according to the referee suggestions. accepted by IMRNDifferential Geometrytext