In this work, we showed for the first time that starch polysaccharides
can act as effective additives for IL lubrication. In
particular, the soluble fractions of G50 starch are found to be
promising candidates to facilitate lubrication of EMIMAc–water
solvents, and solvent quality-responsive polymer films are formed
at surfaces. We also found that starch suspension lubrication
is controlled by the interplay between insoluble starch particulates
(suspension-dominated friction) and dissolved starch
components (polymer-dominated friction), which in turn depends
on the amount of polymeric materials leached from starch in
EMIMAc–water solvents. For the solvents with EMIMAc content
below 60 wt%, we observed behaviour similar to that for particles
in Newtonian solvents and such behaviour is explained by the
entrainment of the particles into the contact (Yakubov, Branfield,
Bongaerts, & Stokes, 2015a). With increasing EMIMAc content
to 60 wt% and above, which is a favourable condition for starch
polymer dissolution, a switch from the suspension-dominated
lubrication to the polymer-dominated lubrication is observed.
In this work, we showed for the first time that starch polysaccharidescan act as effective additives for IL lubrication. Inparticular, the soluble fractions of G50 starch are found to bepromising candidates to facilitate lubrication of EMIMAc–watersolvents, and solvent quality-responsive polymer films are formedat surfaces. We also found that starch suspension lubricationis controlled by the interplay between insoluble starch particulates(suspension-dominated friction) and dissolved starchcomponents (polymer-dominated friction), which in turn dependson the amount of polymeric materials leached from starch inEMIMAc–water solvents. For the solvents with EMIMAc contentbelow 60 wt%, we observed behaviour similar to that for particlesin Newtonian solvents and such behaviour is explained by theentrainment of the particles into the contact (Yakubov, Branfield,Bongaerts, & Stokes, 2015a). With increasing EMIMAc contentto 60 wt% and above, which is a favourable condition for starchpolymer dissolution, a switch from the suspension-dominatedlubrication to the polymer-dominated lubrication is observed.
การแปล กรุณารอสักครู่..
