By Bakeev, Nikolaĭ Filippovich; Volynskiĭ, Aleksandr Lʹvovich
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Extra info for Surface phenomena in the structural and mechanical behaviour of solid polymers
Assuming that each chain exists in a tube, formed by restrictions of the bonds, the complex multi-chain dynamic problem was efficiently solved for the separate chain as the onedimensional diffusion problem. The solution is described by the formula L 2 = 2D 1t, where L is the curvilinear diffusion length of the chain along the axis of its tube, D 1 ~1/M is the one-dimensional diffusion coefficient. The reptation time depends on the molecular mass as τ d ~ M 3 . During this period, the mass centre travels the distance R g (the radius of gyration of the macromolecule).
4 J/m 2 was at least an order of magnitude greater than the work of adhesion of the PS surfaces. Similar values G = 8–9 J/m2 were obtained for the surfaces of polydisperse PS and monodisperse PS with a different molecular mass. This fact indicates that the process of healing of the interfacial surfaces in the PS does not depend on its polydispersion. These observations indicate that the increase of G on the PS–PS surfaces in the investigated temperature range (below T g) is controlled by the diffusion of segments of chains, although the large-scale molecular mobility should be suppressed in these conditions.
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Surface phenomena in the structural and mechanical behaviour of solid polymers by Bakeev, Nikolaĭ Filippovich; Volynskiĭ, Aleksandr Lʹvovich