Irradiation elongation remaining with

Figure 1. Percent elongation remaining with irradiation in the accelerometer film thickness, 0.2 mm...

A 30 Mrad dose of electron irradiation enabled particles to remain intact after dissolution of source samples and recasting into final form. Tensile tests were conducted on several sets of spin cast samples before and after electron irradiation with a dose of 30 Mrad. It was determined that the irradiation increased the yield stress somewhat and decreased the elongation, but substantial amounts of plastic deformation still occurred, indicating the presence of significant levels of craze... 

The ability of the films to support cell adhesion was evaluated by using the film as a substrate for cell growth. Films were placed into wells and coated with a cell rich solution. After seven days, all films were microscopically and histopathologically examined. Some of the results obtained are shown in Figures 4 a-d. Both the PLA and PCL films had complete monolayers on their surfaces comparable to the control. The CH film had either sparse, rounded cells or no cells present. The work by Albanese had determined that cells could not attach themselves to substrates such as EO-sterilized CH. This substrate changed the shape of the cells from the usual elongated cylindrical fibroblast form, to a rounded form and the cells then remained in suspension (34). The y-irradiated chitosan film also showed the same behavior. 

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