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Abstract
The controllable design of interfacial structures is of great importance in the applications of metal/polymer interfaces in a variety of technologies. The vapor deposition of Ca films on poly(methyl methacrylate) (PMMA) was studied as a prototype system to investigate the effects of substrate temperature on metal/polymer interfacial structure, using Ca adsorption microcalorimetry, sticking probability measurements, and X-ray photoemission spectroscopy. Earlier studies showed that when Ca vapor is deposited at room temperature, Ca atoms preferentially diffuse subsurface and react with the ester groups of PMMA at low coverage, leading to the formation of polymeric Ca carboxylates. As Ca coverage increases, the depth of the reacted polymer increases, so that diffusion of Ca through it to find unreacted esters gets slower, leading to an increase in the probability that Ca instead grows 3D Ca(s) particles on the surface, which eventually grow together into a continuous surface film. By deposition of metal vapo...
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