1、Characterization and degradation of poly(vinyl acetate)

The study highlighted the varied degradation of the two adhesives, which exhibit yellowing, alteration of their thermal and spectroscopic features and changes in their surface morphology and viscoelasticity.

2、Photochemical degradation study of polyvinyl acetate paints used in

Thermal and photo degradation of PVAc paint samples were studied by Py–GC/MS with double-shot and single-shot techniques. Changes of the PVAc paint samples before and after UV ageing were revealed. The effects of pigments and ageing status to the degradation of PVAc paint samples were illustrated.

3、How to Achieve a Non

Discover the evolution of PVAc coatings: from yellowing issues to cutting-edge non-yellowing formulations. Explore innovations in durability and sustainability.

4、Poly(Vinyl Acetate) Paints: A Literature Review of Material Properties

This review paper presents the most relevant published information on poly (vinyl acetate) paint materials to help inform subsequent research and to provide information on the risks related to the surface cleaning treatment of poly (vinyl acetate) paint or poly (vinyl acetate)-painted works of art.

The evaluation of selected polyvinyl acetate)

In 1996, the work was first published after three to five years of aging data had accumulated. Measurements for pH, yellowing, strength, and flexibility were recently repeated again and these results are reported here.

High‐Durability Anti‐Fog Coating Based on Carboxyl‐Promoted Anti

A novel polyimide (PI) with a carboxyl side group is synthesized. Cross‐linked hybrid films are prepared by adding a small amount of PI to polyvinyl alcohol (PVA), causing esterification and etherification reactions during the convection drying ...

Aging of a Poly (vinyl acetate)

This study investigates the accelerated degradation, under simulated photoaging, and isothermal treatment of a commercial PVAC-based white glue considered representative of this class of materials used in contemporary artworks to predict its durability and assess its behavior in art objects.

The evaluation of selected poly (vinyl acetate) and acrylic adhesives

A total of 27 poly (vinyl acetate) and 25 acrylic adhesives were tested for pH, volatile emissions (mostly acetic acid), flexibility, strength, and yellowing after aging.

Poly (vinyl Acetate)

Several modifications are used to enhance the resistance to moisture and to decrease creep of PVAc adhesive bonds. One such method is the addition of other types of vinyl monomer during polymerization to improve the properties.

Polyvinyl Acetate

PVAc softens as its temperature is raised above room temperature, and it is less resistant to moisture and humidity than thermosetting resins. For this reason, PVAc adhesives are used in interior applications. In addition, PVAc tends to creep (‘‘cold flow’’) under a sustained load.

Polyvinyl acetate (PVAc) adhesive films, as a commonly used bonding material, are widely applied in industries such as manufacturing, construction, and healthcare. during long-term use, yellowing may occur in some PVAc films, negatively impacting their appearance and potentially compromising product performance. This article explores the primary causes of yellowing in PVAc adhesive films and proposes corresponding solutions.

I. Analysis of Yellowing Causes in PVAc Adhesive Films

1. Photo-Aging: Under sunlight or ultraviolet (UV) radiation, PVAc films undergo photooxidative reactions, leading to molecular structure changes and subsequent yellowing.

2. Thermal Decomposition: In high-temperature environments, polymer chains in PVAc films may break, releasing monomers or other small molecules. These substances react with oxygen in the air to form colored compounds, causing discoloration.

3. Chemical Degradation: Exposure to certain chemicals can trigger chemical degradation of PVAc films, producing colored byproducts and resulting in yellowing.

4. Microbial Activity: In humid conditions, microbial growth may induce biodegradation of PVAc films, generating pigmented metabolic products that cause yellowing.

II. Mitigation Strategies

1. Select High-Quality Raw Materials: Use light-resistant, heat-resistant, and chemically stable PVAc raw materials to enhance the durability and stability of adhesive films.

2. Optimize Production Processes: Improve manufacturing processes to minimize exposure to light, heat, and chemicals. For example, adopt low-oxygen environments, temperature control, and reduced chemical contact.

3. Enhance Storage Management: Store PVAc films properly, avoiding prolonged exposure to sunlight or high temperatures. Maintain dry and ventilated storage conditions to prevent microbial proliferation.

4. Regular Inspection and Maintenance: Implement routine inspection protocols to address yellowing issues promptly, such as replacing damaged films, cleaning equipment, and replacing contaminated components.

5. Use Anti-Yellowing Additives: Incorporate anti-yellowing agents (e.g., UV stabilizers, antioxidants) to improve the film’s resistance to aging and slow color changes.

6. Develop Eco-Friendly Film Variants: Research and create new PVAc films with enhanced light, heat, and chemical resistance to meet growing demands for sustainable materials.

Yellowing of PVAc adhesive films results from complex interactions between multiple internal and external factors. By selecting superior raw materials, optimizing production, improving storage practices, conducting regular maintenance, using anti-yellowing additives, and innovating eco-friendly formulations, the yellowing process can be effectively delayed or reversed. These measures extend the service life of PVAc films and ensure product quality. With advancements in technology and stricter environmental standards, the production and application of PVAc adhesive films are poised for broader发展前景 (prospects for development).

Note: Technical terms and industry-specific expressions were translated to maintain accuracy and clarity for English-speaking audiences.