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Abstract : This work focuses on adhesive films obtained upon film formation of urethane/acrylic hybrid latex particles. These latexes were prepared by a miniemulsion polymerization to ensure a homogeneous incorporation of the PU inside the particles. Studying the morphology of particles and films showed that the grafting of polyurethane is essential to avoid phase separation at the film scale which is harmful for the macroscopic properties. Two parameters affect the mechanical properties of the films: the polyurethane weight fraction controls the linear viscoelastic properties while the degree of grafting of the PU modifies the maximum deformability of the film by modifying the mesh size of the network. The primary interest of the hybridization is to maintain a satisfying adhesion compared to pure acrylic films while increasing the cohesion in the polymer network and thus the shear resistance both at ambient and at high temperature. The preparation of similar hybrid latexes by methods closer to the industrial ones generates adhesive films with qualitatively similar properties. The degree of grafting still affects the maximum deformability of the adhesive but the synthesis conditions strongly increase the level of crosslinking inside each particle resulting in a decreased adhesion level. We finally developed a tensile creep test for this soft material targeted at better evaluating the long term properties of the adhesive films.
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Submitted on : Friday, March 19, 2010 - 2:39:28 PM
Last modification on : Thursday, December 16, 2021 - 3:58:19 AM
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  • HAL Id : tel-00465348, version 1


Elise Degrandi. URETHANE/ACRYLIC HYBRID LATEXES FOR APPLICATION AS PSA. Material chemistry. Université Pierre et Marie Curie - Paris VI, 2009. English. ⟨tel-00465348⟩



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