Figure 7. SEM images of four kinds of composite films after stretching. (Green circles mark the aggregation of LDH nanosheets and orange circles represent the fracture of the film.)
The cyclic stability under tensile condition was further investigated. Because of the generation of small cracks in 120% deformation, the repeated tensile test was carried out under 100% deformation. It can be found that the OTR of (TA@LDH/PEO)50 films does not change much after stretching (Figure S6, Support Information). With the increase of the recycle times, the gas blocking performance only slowly decays, and after 10 recycle times, it decreases by only ∼20%. The excellent performance after multiple stretching makes the (TA@LDH/PEO)50 film a promising candidate for stretchable gas barrier material.