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Self adhesion of uncrosslinked polar elastomers

Abstract : Many industrial processes rely on the superposition of unvulcanized rubber pieces to shape their product. Sufficient adherence between the overlapping layers is necessary to prevent any debonding, slippage and the outbreak of defects.An adaptation of the well documented Probe-Tack test is proposed to characterize the adhesion, and self-adhesion, properties of the materials for long contact times under a weak contact pressure. Whereas the inter-diffusion mechanism of polymer chains at interfaces is well known and has been the topic of many research projects, all these studies have focused non-polar, linear polymers. The self-adhesion properties of a polar elastomer, nitrile rubber, are studied and are shown to be very weak compared to those of a classical non-polar SBR elastomer. Our work focusses on the mechanisms responsible for adhesion between polar elastomers with high polydispersity and molar mass. We show that the studied poly(acrylonitrile-co-butadiene) is actually a block copolymer composed of polybutadiene blocks, and blocks of alternating butadiene-acrylonitrile sequences. This composition leads to the formation of a lamellar structure with time, and the strong intermolecular polar interactions create a physical network preventing the polymer chains to diffuse. Such organization is responsible for the weak self-adhesion properties of nitrile rubber, and two strategies are proposed to enhance them. It is shown that the use of polar tackifier is effective, even at low concentration, if sufficient contact time is achieved. The use of solvent to weld both surfaces, called “solvent welding”, is investigated and shown to be essential to reach high adhesion levels.
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  • HAL Id : tel-02896761, version 1

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Valentine Hervio. Self adhesion of uncrosslinked polar elastomers. Material chemistry. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLET035⟩. ⟨tel-02896761⟩

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