A solvent mixture, LiOH/urea/H2O with a weight ratio
of 4.6:15:80.4 was precooled at -12 C. A desired
amount of cellulose was dispersed in the precooled
solvent and the mixture was stirred vigorously at
1,200 rpm for 2 min to form a transparent and viscous
solution of a 6 wt% cellulose concentration. The
cellulose solution thus obtained (35 ml) was degassed
by centrifugation at 10,000 g for 10 min, spread on a
glass plate, and then immersed in an aqueous solution
(*2.5 l) containing 5 wt% H2SO4 and 5 wt% Na2SO4
at 20 C for regeneration. The film-like hydrogel of
regenerated cellulose thus formed, which had *1 mm
thickness and *500 cm2 area, was repeatedly washed
with an excess volume of water by soaking.
A solvent mixture, LiOH/urea/H2O with a weight ratio
of 4.6:15:80.4 was precooled at -12 C. A desired
amount of cellulose was dispersed in the precooled
solvent and the mixture was stirred vigorously at
1,200 rpm for 2 min to form a transparent and viscous
solution of a 6 wt% cellulose concentration. The
cellulose solution thus obtained (35 ml) was degassed
by centrifugation at 10,000 g for 10 min, spread on a
glass plate, and then immersed in an aqueous solution
(*2.5 l) containing 5 wt% H2SO4 and 5 wt% Na2SO4
at 20 C for regeneration. The film-like hydrogel of
regenerated cellulose thus formed, which had *1 mm
thickness and *500 cm2 area, was repeatedly washed
with an excess volume of water by soaking.
การแปล กรุณารอสักครู่..
