quý hiếm

quý hiếm

Kết quả (Anh) 1:

rare

Kết quả (Anh) 2:

Very rare.

Kết quả (Anh) 3:

The results obtained in the work demonstrate significant changesin the structure of St/Chit/PVA films with a variation of the PVA content in their composition. PVA addition of in the concentration of10–40 wt% to the St/Chit blend enhances the intermolecular interactions between St and Chit, the higher is the PVA content the more itgrows. At the same time, the phase separation between the PVA andthe St/Chit matrix increases. The UV-protective properties of composite films associated with the Chit macromolecular structure arecompletely preserved when the PVA is added to the composition inthe concentration up to 30 wt%. The transparency of the films, inthis case, increases. The mechanical properties and biodegradabilitytests show that the PVA added to the St/Chit (70/30) matrix in aamount of 10–20 wt% is the optimal supplement providing thefilms with improved mechanical and functional characteristics without loss of biodegradability.