Polyurethane
(PU) was synthesized in our laboratory according to previous
study [35, 36]. GO nanosheets were prepared according to
the method described by Hummer with a modification [37,
38]. In brief, powdery GO was dispersed in a 50mL of
DMF and dichloromethane (volume ratio = 2/3) solution
by ultrasonification to form a uniform suspension. After
that, 12wt.% PLA (Mw = 26,000) and 3wt.% PU (mass
ratio = 4/1) were dissolved into the suspension with the aid
of ultrasonification and stirring. Subsequently, PLA/PU/GO
composite film was obtained by casting the suspension onto
a clean silicon wafer, evaporating organic solvents, drying at
60
∘
C in vacuumfor 24h, andpeeling fromthe Si wafer. Inour
system, the PLA/PU/GO composite films with two different
GO contents (the weight ratios between GO and polymers
were 3 : 100 and 5 : 100) were prepared, which were denoted
as PLA/PU/GO (3%) and PLA/PU/GO (5%), respectively.
In comparison, PLA/PU film was prepared under the same
conditions.
Polyurethane
(PU) was synthesized in our laboratory according to previous
study [35, 36]. GO nanosheets were prepared according to
the method described by Hummer with a modification [37,
38]. In brief, powdery GO was dispersed in a 50mL of
DMF and dichloromethane (volume ratio = 2/3) solution
by ultrasonification to form a uniform suspension. After
that, 12wt.% PLA (Mw = 26,000) and 3wt.% PU (mass
ratio = 4/1) were dissolved into the suspension with the aid
of ultrasonification and stirring. Subsequently, PLA/PU/GO
composite film was obtained by casting the suspension onto
a clean silicon wafer, evaporating organic solvents, drying at
60
∘
C in vacuumfor 24h, andpeeling fromthe Si wafer. Inour
system, the PLA/PU/GO composite films with two different
GO contents (the weight ratios between GO and polymers
were 3 : 100 and 5 : 100) were prepared, which were denoted
as PLA/PU/GO (3%) and PLA/PU/GO (5%), respectively.
In comparison, PLA/PU film was prepared under the same
conditions.
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