Welding dynamics in an atomistic model of an amorphous polymer blend with polymer–polymer interface

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  • Dmitry G. Luchinsky
    KBR, Inc., NASA Ames Research Center Moffett Field California USA
  • Halyna Hafiychuk
    KBR, Inc., NASA Ames Research Center Moffett Field California USA
  • Vasyl Hafiychuk
    KBR, Inc., NASA Ames Research Center Moffett Field California USA
  • Kenta Chaki
    Materials Science Section, Engineering Technology Division JSOL Corporation Tokyo Japan
  • Hiroya Nitta
    Materials Science Section, Engineering Technology Division JSOL Corporation Tokyo Japan
  • Taku Ozawa
    Materials Science Section, Engineering Technology Division JSOL Corporation Tokyo Japan
  • Kevin R. Wheeler
    NASA Ames Research Center Moffett Field California USA
  • Tracie J. Prater
    NASA Marshal Space Flight Center Huntsville Alabama USA
  • Peter V. E. McClintock
    Department of Physics Lancaster University Lancaster UK

抄録

<jats:title>Abstract</jats:title><jats:p>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 <jats:italic>t</jats:italic><jats:sub>w</jats:sub> 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 <jats:italic>t</jats:italic><jats:sub>w</jats:sub> = 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 <jats:italic>t</jats:italic><jats:sub>w</jats:sub> > 60 ns. It is shown that both strain–stress and shear viscosity curves agree with experimental data.</jats:p>

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