The difference between POvidone and copovidone as adhesives

First, the characteristics of POvidone as an adhesive
Povidone (PVAc) is a colorless, transparent polymer commonly used in the preparation of glues and adhesives. It has good mechanical properties, chemical stability and bonding properties, and can be bonded with cellulose materials, wood, metal and other materials. However, the hydrothermal properties of POvidone are relatively poor, and it is easy to decompose in water, so it is not suitable for bonding work in humid environments.

Second, the characteristics of copovidone as an adhesive
Polypovidone (PVP/VA) is a copolymer of polyvinylpyrrolidone and polyvinyl alcohol acrylate, which has excellent hydrothermal properties, corrosion resistance and biocompatibility, and is widely used in medical devices, food packaging and cosmetics industries. Compared with POvidone, the mechanical properties of copovidone are slightly inferior, but its hydrothermal stability is strong, it does not decompose in water, and it can perform bonding work in humid environments.
The principle of copovidone as a binder
Copovidone (PVP) has several principles as an adhesive. First, PVP has excellent hydrophilic and lipophilic properties, making it compatible with a variety of substances, thus playing a bonding role in different systems. Secondly, PVP has a high molecular weight and flexibility, can form a durable adhesive force, so that it can provide good bonding effect in coating, glue and other applications. In addition, PVP molecular structure contains a large number of polar groups, so that it can interact with a variety of substances such as hydrogen bonding or van der Waals forces, thereby enhancing the bonding effect.
In addition, the polymer network structure formed by PVP in aqueous solution can form a uniform film after drying, thus providing good bonding properties. In addition, PVP also has good stability and compatibility, and can be compatible with a variety of compounds, thus playing a bonding role in different application fields. In general, the principle of copovidone as a binder mainly includes its molecular structure, physical properties and chemical properties, so that it can play a good bonding effect in a variety of applications.
Third, the difference between POvidone and co-povidone in adhesive applications
Povidone and co-povidone as adhesives, their application scenarios and material matching have some differences. Povidone is suitable for occasions with high mechanical requirements and no need for water resistance, such as sheet metal processing, furniture manufacturing, packaging and printing industries. Copovidone is suitable for occasions with high requirements for water and wet environment, such as medical tape, food bags, surgical sutures, etc.
Iv. Summary
Povidone and co-povidone are both polymer compounds, but there are some differences when used as adhesives. Povidone has good chemical stability and mechanical properties, but its hydrothermal properties are slightly inferior to that of co-povidone. Copovidone has excellent hydrothermal properties, corrosion resistance and biocompatibility, but its mechanical properties are slightly inferior to POvidone. In practical applications, it is necessary to select the appropriate adhesive according to the specific scene and material characteristics.