Compréhension des mécanismes de perte de plastifiant et d'exsudation des PVC plastifiés

Abstract : Plasticized polyvinyl chloride (PVC) is a plastic widely used in patrimonial collections but its state of preservation is often considered as poor. The most frequent degradations are the exudation and the loss of flexibility of objects which are related to the progressive migration of the plasticizer towards the surface of the material.The project thesis aimed to better understand the alteration of plasticized PVC objects and predict conditions of conservation and restoration treatments.This study was conducted with both a simplified formulation of PVC and an ancient PVC naturally aged in museum.The kinetics of plasticizer migration and structural modifications of PVC chains were characterized during artificial ageing of films conducted through the most representative conditions of a museum environment of exposure or conservation.The impact of surface cleaning was studied in terms of efficiency but also subsequent degradation of the PVC, in particular the recurrence of exudates. The effect of different conditionings on the ageing of flexible PVC, either cleaned or not, was also estimated. Packaging materials frequently used by conservators have been considered.This work allowed achieving new insights on the effect of methods used for conservation and preservation of plasticized PVC artefacts.
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Adeline Royaux. Compréhension des mécanismes de perte de plastifiant et d'exsudation des PVC plastifiés. Polymères. Université de Cergy Pontoise, 2017. Français. ⟨NNT : 2017CERG0907⟩. ⟨tel-01788511⟩

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