Abstract
Raw lacquer (RL), ethanol being used as the solvent, was added to polyvinyl pyrrolidone (PVP) and then electrospun into RL/PVP nanofilms. Manufacturing parameters such as RL/PVP ratio, voltage, flow velocity, needle type, and the distance between syringe and the collection board were systematically investigated. A scanning electronic microscope (SEM) was used to observe the surface morphology of nanofilms; the block drop method was used to measure the water contact angle; the mechanical properties of RL/PVP nanofilms of different proportions were tested by universal material testing machine; and Fourier-transform infrared spectroscopy (FT-IR) was used to characterize the structure. Based on the water resistance and acid resistance measurements, the proposed nanofilms demonstrated to be water and acid resistant were successfully produced. The results show that PVP that melts in water becomes incompatible with water after adding raw lacquer, and the acid resistance is greatly improved. Furthermore, the smaller the fiber diameter, the better the mechanical properties of the nanofilms are under low ratio of RL/PVP. With a high proportion of RL/PVP, the inner structure of the nanofilm is denser, and the water resistance and acid resistance are better. The dense structure can protect the inner material of the nanofilms.
Highlights
Raw lacquer (RL)—commonly called as Chinese lacquer—is a natural polymer matrix composite mainly composed of urushiol (60–65%), water (20–30%), gummy substance (5–7%), glycoproteins (2%) and laccase (0.2%) [1,2]
Gao et al found that the presence of hexamethylenetetramine (HMTA) in RL had a positive influence on the performances of lacquer films as it improved the morphology, luster, distinctness of image (DOI), hardness, thermal stability and alkali resistance of the coating membranes [8]
RL/polyvinyl pyrrolidone (PVP) nanofilms can be used as a coating layer that provides waterproof function and acid resistance, thereby increases the service life of the materials that the nanofilms enwrap
Summary
Raw lacquer (RL)—commonly called as Chinese lacquer—is a natural polymer matrix composite mainly composed of urushiol (60–65%), water (20–30%), gummy substance (5–7%), glycoproteins (2%) and laccase (0.2%) [1,2]. There have been a considerable scholars investigating the chemical structure and properties of RL as well as conducting studies on the related applications in other fields constantly. Gao et al found that the presence of hexamethylenetetramine (HMTA) in RL had a positive influence on the performances of lacquer films as it improved the morphology, luster, distinctness of image (DOI), hardness, thermal stability and alkali resistance of the coating membranes [8]. Xu et al used a water-assisted assembly method to produce urushiol-formaldehyde polymer (UFP) membranes that had a porous structure—and good hydrophobic properties and acid and alkali resistance [10]. Kim et al used urushiol of RL to synthesize a series of poly (methyl methacrylate)-urushiol polymer composition which were made into membranes with better thermal stability, highly effective antibacterial and antifouling capacity [7]
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