Characterisation of films
Thickness: The thickness of film influence the time required to absorb the polymer into the body. To determine the uniform in thickness of film it was measured in each film using screw gauge at three different sites of the film and the mean was calculated.
Folding endurance: It was determined to find the flexibility of film which is needed to handle the film easily and for comfortable, secured application of film on the wound. It was determined by repeatedly folding one film at same place till it breaks or folded upto 300 times manually. The number of times of film could be folded at the same place without breaking give the value of folding endurance.
Water absorption capacity: It is of utmost importance, if they are used for biological applications and wound healing. It is used to measure the capacity of film to absorb wound exudates. Preweighed one inch film was placed in 15ml. of distilled water and the weight of the film was noted periodically at first hour, second hour, third hour and 24th hour. Every time after noting the weight, the film was placed in fresh water. Water absorption capacity of the film was