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Interface characteristics of polystyrene (PS) melts in free-standing thin films and on a graphite surface were investigated by molecular dynamics simulations employing an explicit all-atom force field. The calculated surface tension is in good agreement with experiment, which provides good support for the force field parameters employed. In the polymer/vacuum free-surface region, the density profile...
Poly(norbornene imide)s prepared by ring opening metathesis polymerization (ROMP) have been generally synthesized from 5-norbornene-exo,exo-2,3-dicarboximides (exo-NDIs), since 5-norbornene-endo,endo-2,3-dicarboximides (endo-NDIs) exhibit considerably lower reactivity toward conventional ROMP catalysts as compared with exo-NDIs. Therefore, there has been limited information on poly(endo-NDI)s, although...
This paper describes palladium (II) catalyst based synthesis and detailed characterization of vinyl-type polynorbornenes (PNBs) with bulky phenyl, adamantane, or norbornane substituents linked by ester, ether, or alkyl bridges. The structure–property relationships of the substituted PNBs were investigated concerning the thermal stability, glass transition temperature, wide-angle X-ray scattering (WAXS)...
We report time-resolved photoluminescence (PL) spectroscopy study of solutions and thin films of pure penta-fluorenes with varying alkyl side-chain structures. While no low-energy green emissions were observed in solutions, spin-cast and vacuum dried initial films exhibited low-energy emission in time-delayed PL spectra, centered at 490nm, whose intensity varied strongly with the side-chain structure...
Processible poly(methylsilsesquioxane)s (PMSSQs) were prepared in refluxing THF solutions under nitrogen atmosphere in the presence of HCl catalyst. It was found that various reaction parameters such as concentration, temperature, reaction time, relative amount of water, and relative amount of acid catalyst could affect the molecular weight, microstructure, and the amount of functional end-groups...
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