The specified amount of Na–MMT determined according to
Table 1, was added to 99.5 g of distillated water under rigorous
mixing for 20 min at 80 C. Then, the resulted aqueous suspension
homogenized for 20 min at 80 C via sonication method to make a
uniform solution. Then proper amount of glycerol according to
Table 1 with 5 g of pristine corn starch was added and mixed by
stirrer for 10 min and sonicated for 20 min at room temperature.
The final mixture placed in water bath (80 ± 0.2 C) under mild
stirring for 30 min. The gelatinized solution was gently mixed in
order to release bubbles. The casting solution was poured into
polystyrene petri dishes and placed on a flat surface in the laboratory
(23 ± 2 C, 52 ± 3% RH). To study the film thickness, 22.000 g of
the cooled casting solution was poured into polystyrene petri
dishes with internal diameter of 6.1 cm. The thickness of each film
was measured at fifteen different locations with a hand-held
micrometer (Mitutoyo, Japan). Average of each five random points
was considered as one datum. It is worth mentioning each sample
was prepared three times and their average results were reported.
After 36 h, films were carefully separated and stored in poly ethylene
bags.
The specified amount of Na–MMT determined according to
Table 1, was added to 99.5 g of distillated water under rigorous
mixing for 20 min at 80 C. Then, the resulted aqueous suspension
homogenized for 20 min at 80 C via sonication method to make a
uniform solution. Then proper amount of glycerol according to
Table 1 with 5 g of pristine corn starch was added and mixed by
stirrer for 10 min and sonicated for 20 min at room temperature.
The final mixture placed in water bath (80 ± 0.2 C) under mild
stirring for 30 min. The gelatinized solution was gently mixed in
order to release bubbles. The casting solution was poured into
polystyrene petri dishes and placed on a flat surface in the laboratory
(23 ± 2 C, 52 ± 3% RH). To study the film thickness, 22.000 g of
the cooled casting solution was poured into polystyrene petri
dishes with internal diameter of 6.1 cm. The thickness of each film
was measured at fifteen different locations with a hand-held
micrometer (Mitutoyo, Japan). Average of each five random points
was considered as one datum. It is worth mentioning each sample
was prepared three times and their average results were reported.
After 36 h, films were carefully separated and stored in poly ethylene
bags.
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