3.4. Mechanical properties<br>The handling quality of wound dressing can be determined by the mechanical properties. Assessment of elongation at break and tensile strength (TS) for all samples are illustrated in Table 1 and Fig. 4. The tensile strength of the PU, PU-HA, PU-HA/0.5% EEP, PU-HA/1% EEP, and PUHA/2% EEP samples were 5.42± 1.4, 5.05± 0.8, 4.91± 0.5, 4.86± 0.9, and 3.07±1.1MPa, respectively. Also, the PU, PU-HA, PU-HA/0.5% EEP, PU-HA/1% EEP, and PU-HA/2% EEP samples' elongation at break were measured 354.5 ± 15.7, 360.1 ± 12.2, 379.8 ± 23.6, 382.2 ± 14.3, 453.6 ± 38.5 MPa, respectively. Although HA incorporation didn't cause a significant effect (P N 0.05) on the samples' TS, increasing of the EEP content could dramatically (P b 0.05) decrease the TS value.<br>The TS value decrease can cause the formation of enlarging spaces between the polymeric chains and increase of the samples' flexibility. Many studies have reported the plasticizing feature of EEP which can enhance the wound dressings' flexibility by increasing the polymer chains' movement, elongation and also, decreasing of the TS. Although the TS value was decreased due to the incorporation of EEP, it was still high enough to be appropriate for a wound dressing.
การแปล กรุณารอสักครู่..
