A series of poly(styrene-co-octadecylmaleimide)
with various imidization degrees as flow improvers for model waxy
oils with asphaltenes were prepared through the reaction between octadecyl
amine and poly(styrene-co-maleic anhydride) (SMA)
with random and alterative structure. With a small amount of the designed
flow improvers, the wax crystals became fewer, smaller, and more dispersed
in the oils, asphaltene particles were better dispersed, and the crystallization
temperature and yield stress were reduced considerably. Moreover,
it had been found that the performance of the resultant flow improvers
for the bituminous paraffin oils is significantly affected by the
imidization degree and maleic anhydride content, which are evaluated
in terms of the polarity.
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