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Welding dynamics in an atomistic model of an amorphous polymer blend with polymer–polymer interface
Author(s) -
Luchinsky Dmitry G.,
Hafiychuk Halyna,
Hafiychuk Vasyl,
Chaki Kenta,
Nitta Hiroya,
Ozawa Taku,
Wheeler Kevin R.,
Prater Tracie J.,
McClintock Peter V. E.
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20190253
Subject(s) - materials science , polyetherimide , composite material , welding , polymer , polycarbonate , polymer blend , ultimate tensile strength , reptation , copolymer
We consider an atomistic model of thermal welding at the polymer‐polymer interface of a polyetherimide/polycarbonate blend, motivated by applications to 3D manufacturing in space. We follow diffusion of semiflexible chains at the interface and analyze strengthening of the samples as a function of the welding time t w by simulating the strain–stress and shear viscosity curves. The time scales for initial wetting, and for fast and slow diffusion, are revealed. It is shown that each component of the polymer blend has its own characteristic time of slow diffusion at the interface. Analysis of strain–stress demonstrates saturation of the Young's modulus at t w = 240 ns, while the tensile strength continues to increase. The shear viscosity is found to have a very weak dependence on the welding time for t w > 60 ns. It is shown that both strain–stress and shear viscosity curves agree with experimental data.