1、Factors affecting hydrolysis of polyvinyl acetate to polyvinyl alcohol

In the hydrolysis reaction of polyvinyl acetate with alkali catalyst, the hydroxyl group that replaces the acetate groups functions as a catalyst itself. Thus, the rate of hydrolysis increases with the reaction time in producing more hydrolyzed PVA.

2、Synthesis of Well

Abstract This work aims at synthesizing tailor-made poly (vinyl alcohol- co -vinyl acetate) (PVA) amphiphilic copolymers, obtained by alcoholysis of poly (vinyl acetate) (PVAc) that could display improved properties as stabilizers compared to commercially available PVAs.

3、Grafting reactions of vinyl acetate onto poly[(vinyl alcohol)

After polymerization the samples were hydrolyzed and reacetylated in order to determine where grafting occurs along the poly[(vinyl alcohol)-co-(vinyl acetate)] chain.

4、Preparation of well

In this work we demonstrate the production of PVAc with a well-defined and linear structure by reversible addition-fragmentation chain transfer (RAFT) polymerization under conditions in which chain transfer is reduced.

5、Preparation of poly(vinyl alcohol) with enhanced stereoselectivity via

PVAc is prepared by radical polymerization using 7-membered ring controlling agents. PVAc is hydrolyzed to get PVA with enhanced stereoselectivity. Flow chemistry is used to prepare PVAc and its hydrolyzed product PVA. The melting point of PVA was increased by increase in its stereoregularity.

Conversion of polyvinyl acetate to polyvinyl alcohol, a commercial

I want to convert polyvinyl acetate to polyvinyl alcohol on commercial scale. if somebody have idea or procedure then let me know.

Conversion Enhancement of Vinyl Acetate Monomer to Polyvinyl Acetate

To improve the chemical, physical, mechanical and thermal properties of polyvinyl acetate (PVAc), N-hydroxymethyl acrylamide (NMA) was used to polymerize with vinyl acetate (VAc).

Modifications of poly (vinyl alcohol) for use in poly (vinyl acetate

The chemical changes can be carried out either in the preparation of PVA through hydrolysis of copolymers of vinyl acetate and other monomers, or by the reaction of modifiers with PVA aqueous solutions.

Conversion Enhancement of Vinyl Acetate Monomer to Polyvinyl Acetate

Synthesis of Polyvinyl Acetate (PVAc) through the conversion of Vinyl Acetate Monomer (VAM) was carried out by emulsion polymerization method assisted by thermal initiator Ammonium persulfate (APS) under reaction temperature was kept at 70 °C – 80 °C with 5 hours of reaction time and agitation speed at 300 rpm.

Hydrolysis of polyvinyl acetate to obtain polyvinyl alcohol

Download scientific diagram | Hydrolysis of polyvinyl acetate to obtain polyvinyl alcohol from publication: Adsorption of Dyes Using Poly (vinyl alcohol) (PVA) and PVA-Based Polymer...

In the world of chemistry, chemical reactions serve as the cornerstone for constructing new materials and addressing practical challenges. Today, we will explore a critical chemical process—the transformation of vinyl acetate (VA) into polyvinyl alcohol (PVA)—and delve into its scientific principles, applications, and environmental implications.

1. Overview of the Reaction

Vinyl acetate (VA) is a polymer formed by the copolymerization of acetic acid and ethylene under catalytic conditions. This material is widely utilized across various industries due to its unique properties. Polyvinyl alcohol (PVA), on the other hand, is a water-soluble polymer known for its excellent film-forming ability, adhesiveness, and biocompatibility, making it a staple in textiles, paper manufacturing, coatings, and more.

2. Reaction Mechanism

The synthesis of PVA involves two primary steps: copolymerization of ethylene and acetic acid, followed by alkaline hydrolysis of the copolymer.

• Step 1: Under catalytic action, ethylene monomers combine with acetic acid molecules to form oligomers. As polymerization progresses, these oligomers grow into high-molecular-weight polymers.
• Step 2: The resulting copolymer undergoes hydrolysis in an alkaline environment, where acetate groups are replaced by hydroxyl groups, yielding polyvinyl alcohol.

3. Applications

• Textiles: PVA’s superior dyeability and softness make it ideal for fabrics like underwear, socks, and bedsheets.
• Paper Industry: As a paper strengthener, PVA enhances tensile strength and water resistance.
• Construction: Its strong adhesive properties enable PVA to bond wood, metals, and other materials effectively.
• Coatings: PVA’s film-forming capabilities and transparency render it a key ingredient in paints and coatings.

4. Environmental Considerations

Despite its versatility, PVA production poses environmental challenges, particularly in treating wastewater containing unreacted vinyl acetate. Direct discharge of this wastewater could harm ecosystems. Future research priorities include developing efficient wastewater treatment technologies and advancing resource recovery to minimize environmental impact.

From a chemical perspective, the conversion of vinyl acetate to polyvinyl alcohol exemplifies the elegance of chemical transformations and highlights technology’s role in addressing real-world needs. With ongoing advancements and heightened environmental awareness, greener, more efficient PVA production methods lie ahead. Meanwhile, innovations in VA wastewater treatment will further advance sustainable practices in the chemical industry.