RETRACTED: Effect of post-heat treatment on the UV transmittance, hydrophobicity, and tensile properties of PVA/Uncaria gambir extract blend films
Dieter Rahmadiawan, Hairul Abral, Ilham Chayri Iby, Hyun‐Joong Kim, Kwang‐Hyun Ryu, H. S. Kwack, Razan Muhammad Railis, Eni Sugiarti, Ahmad Novi Muslimin, Dian Handayani, Khiky Dwinatrana, Shih-Chen Shi, Rahadian Zainul, Rahmat Azis Nabawi
Abstract
The physical and mechanical properties of biopolymers can be improved by heating technologies. In this research, we improved the properties of Polyvinyl alcohol (PVA)/ Uncaria gambir extract (UGE) blend films by post-heating method. After post-heating, the blend film exhibited higher resistance to UV light and improved contact angle performance, while water vapor permeability and moisture absorption decreased. The tensile strength and toughness of the PVA/UGE blend film with a post-heating duration of 40 minutes were 68.8 MPa and 57.7 MPa, respectively, an increase of 131 % and 127 %, compared to films without post-heating. This facile and cost-effective fabrication method, with environmentally friendly properties, can be applied to biodegradable PVA/UGE blend films to achieve desired properties for optical devices or food packaging materials.