Abstract
Corona discharge is widely used as a good surface pretreatment method for polymer materials. In this work, the attenuated total reflectance Fourier transform infrared spectrometry (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), scanning electronic microscopy (SEM), and atomic force microscopy (AFM) were used to investigate the behavior of biaxially oriented polypropylene (BOPP) film treated by corona discharge. The possibly involved chemical reactions during the corona treatment process under atmosphere components were systematically summarized. This work lays a theoretical basis for improving the performance of BOPP films and expanding their application fields.
Highlights
Polypropylene (PP) as a thermoplastic resin is an important member of polyolefin and is one of five general synthetic resins [1,2]
Film, a new chemical structure is found on the surface of corona biaxial stretch polypropylene (BOPP) film
The absorption peak at 1537–1858 cm−1 corresponds to carbonyl absorption peak [30], the absorption peak at 1350 cm−1 belongs to nitrate absorption peak, and the broad absorption peak at 3100–3600 cm−1 comes from the amino group and hydroxyl group absorption peak [31,32]. These new absorption peaks can be attributed to the crack of chemical bonds on the surface of BOPP film, which are caused by corona discharge treatment and the formation of free radicals
Summary
Polypropylene (PP) as a thermoplastic resin is an important member of polyolefin (polyethylene, polypropylene, polybutylene) and is one of five general synthetic resins (polyethylene, polystyrene, polypropylene, polyvinyl chloride, and acrylonitrile butadiene styrene plastic) [1,2]. After the corona discharge treatment, the carbonyl or nitrogen-containing polar functional groups can be generated on the molecular chain of the polymer material to meet the pretreatment requirements of top-grade printing, polymerization, coating, and gold stamping processes. The oxidization reaction can produce the polar functional groups on the film, which can improve its surface energy, wettability, and adhesion property. Some researchers investigated the behavior of corona treatment for PP films They generally thought that the surface properties of film are improved owing to a series of complex reactions from corona, such as surface cleaning, activation, crosslinking, and etching. The interaction reactions between corona treatment and the surface of BOPP film was proved and the chemical reactions during corona treatment were proposed in detail, which will lay a theoretical foundation for improving the adhesion of BOPP film in printing inks, paints, adhesives, and other coating applications
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