Post-crosslinking modification of thermoplastic starch/PVA blend films by using sodium hexametaphosphate

► Thermoplastic starch (TPS)/PVA blend films were modified by post-crosslinking. ► The post-treatment consists of soaking the films in aqueous solutions and heating. ► The effects of treating conditions on the properties of the films were investigated. ► The described method can be used to optimize properties of TPS/PVA based products.