Welding behavior of semi-crystalline polymers 2. The effect of cocrystallisation on autoadhesion

Y.-Q. Xue, T.A. Tervoort, S. Rastogi, P.J. Lemstra

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    Abstract

    The effect of cocrystallization on the welding behavior of semicrystalline polymers was studied by means of T-peel testing at room temperature, using ultrahigh-molecular-weight polyethylene (UHMWPE) as a model polymer. Solution-cast films of UHMWPE have a very special morphology, consisting of regularly stacked, 107 angstroms thick lamellae, which exactly double in thickness upon annealing for 15 min below the melting point at 125 °C. This lamellar doubling process was used to introduce a well-defined amount of cocrystallization across the interface, by annealing two stacked, completely wetted solution-cast films. It was found that doubling of the lamellae across the interface enhances the peel energy to such a level that the films could not be separated anymore. By contrast, reference samples, in which cocrystallization across the interface was prohibited by `preannealing' one side of the film, could still be separated easily. Therefore, it is concluded that cocrystallization across the interface is extremely efficient in enhancing the adhesive fracture energy.
    Original languageEnglish
    Pages (from-to)7084-7087
    Number of pages3
    JournalMacromolecules
    Volume33
    Issue number19
    DOIs
    Publication statusPublished - 2000

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