Abstract
Most gas barrier films produce cracks that lead to a significant loss of gas barrier integrity when strain is applied. In order to fabricate stretchable gas barrier films with low water permeability and high endurance after stretching, we used polydiallydimethylammonium (PDDA) mixed with graphene oxide (GO) and poly (vinyl alcohol) (PVA) mixed with montmorillonite (MMT). These films were manufactured by layer-by-layer assembly on an Ecoflex/polydimethylsiloxane (PDMS) substrate with pre-strain applied. A total of 30 layers of PDDA (GO)/PVA (MMT) coated on the substrate exhibited a low water vapor transmission rate of 2.5 × 10−2 g/m2 day after 100 cycles of stretching (30% strain). In addition, they exhibited a high light transmittance of 86.54%. Thus, the prepared stretchable gas barrier film has potential applications as a barrier film in transparent and stretchable electronic devices.
Highlights
As the demand for flexible and stretchable electronic devices increases, flexible and stretchable gas barrier films are in great need to prevent moisture from entering devices to increase the lifetime and stability of electronics and display devices [1,2,3]
Instead of a vacuum process for depositing inorganic layers [6,7,8], a layer-by-layer (LBL) assembly method based on solution processing via electrostatic attraction was used to deposit the passivation layer [9,10,11]
LbL assembly by absorption from the solution is a good approach to the fabrication of near perfectly oriented and aligned nano-material/polymer multilayers
Summary
As the demand for flexible and stretchable electronic devices increases, flexible and stretchable gas barrier films are in great need to prevent moisture from entering devices to increase the lifetime and stability of electronics and display devices [1,2,3]. Inorganic layers have been fabricated by vacuum processes. Vacuum processing has the disadvantages of low production efficiency and high production costs [5]. To solve this problem, we fabricated a stretchable gas barrier film using nano-materials and polymers in place of inorganic layers. As nano-materials to lengthen the moisture permeation path of water, graphene oxide (GO) and montmorillonite (MMT) were used. Since GO exhibits a large aspect ratio and MMT is a plate-like material, they were suitable for gas barrier films [12,13,14,15]. In our paper, GO and MMT were used to form a flexible gas barrier film for improved transmittance and a decrease in the water vapor transmission rate.
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