Fig. 4a illustrates the cumulative curve for formic acid concentrationin water over time. As expected, a higher formic acid contentgreatly increases the biocide concentration in water. It can also be seen that concentration remains constant over the time interval tested. This means that formic acid release entirely occurs within the 24 first hours (first measurement), after which diffusion rate drops down to zero. WG-based matrix is not capable of regulating a progressive release of this substance, which consequently would limit the suitability of this active bioplastic for applications where the active agent can be delivered straightaway. On the other hand, compression-moulding temperature seems to produce some differences, as a lower formic acid release is noticed if compression- moulding is performed at 120 C (compare curves for 10 wt.% FA). Related to this, TGA results have shown the mass loss of formic acid is complete at 100 C.
Fig. 4a illustrates the cumulative curve for formic acid concentrationin water over time. As expected, a higher formic acid contentgreatly increases the biocide concentration in water. It can also be seen that concentration remains constant over the time interval tested. This means that formic acid release entirely occurs within the 24 first hours (first measurement), after which diffusion rate drops down to zero. WG-based matrix is not capable of regulating a progressive release of this substance, which consequently would limit the suitability of this active bioplastic for applications where the active agent can be delivered straightaway. On the other hand, compression-moulding temperature seems to produce some differences, as a lower formic acid release is noticed if compression- moulding is performed at 120 C (compare curves for 10 wt.% FA). Related to this, TGA results have shown the mass loss of formic acid is complete at 100 C.
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