1、The Alcoholysis of Polyvinyl Acetate*
Effect of composition and structure of ethylene-vinyl acetate copolymer on its alcoholysis kinetics: A combined experimental and DFT study. Chemical Engineering Journal 2023, 477 , 146965. https://doi.org/10.1016/j.cej.2023.146965
2、Alcoholysis of ethylene
Therefore, we developed a new method to study the alcoholysis of EVA with 32 mol% ethylene content based on in situ FTIR spectroscopy. The feasibility and accuracy of this method was carefully studied. A kinetic model for predicting reaction rate was obtained using this method.
3、The Alcoholysis Reaction of Vinyl Acetate
The synthesis of EVOH involves two key steps: the free radical solution copolymerization of ethylene and vinyl acetate, and the alcoholysis of ethylene-vinyl acetate copolymer (EVA).
4、Study of the Alcoholysis of Ethylene
Study of the Alcoholysis of Ethylene-Vinyl Acetate Copolymers with Methanol in the Extrusion Process. We investigated the sodium methanolate (NaOMe) catalyzed transesterification of ethylene-vinyl acetate copolymers (EVA) of different compositions with the less compatible methanol (MeOH).
5、Journal of Applied Polymer Science
Alcoholysis is an important reaction for the current industrial production of ethylene-vinyl alcohol (EVOH) copolymers. Herein, two series of ionic liquids (ILs), acidic and basic ones, were used as eco-friendly catalysts for alcoholysis of ethylene-vinyl acetate (EVA) copolymer.
Alcoholysis Reaction of Polyvinyl Acetate
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.
Kinetics of alcoholysis of poly (vinyl acetate)
It was found that PVAc alcoholysis reaction rate was proportional to the concentration of PVAc at temperature of 30-45°C, alkali molar ratio of 10‰-25‰, water content of 0.25%-2.5%. The...
The Alcoholysis of Polyvinyl Acetate
Abstract This study provides additional insight into the effects of different operating parameters on the degree of hydrolysis of PVA with the presence of sodium hydroxide. An environmentally friendly starch-based wood adhesive was developed using cassava starch (CS) and polyvinyl alcohol (PVOH).
Alcoholysis of Ethylene
Studied the kinetics of EVA alcoholysis catalyzed by alkaline systematically. Obtained a kinetic model of EVA alcoholysis capable for reaction process prediction. Achieved fast and controlled alcoholysis of EVA in a microflow system.
The Alcoholysis of Polyvinyl Acetate
Kirkbright, G.; Menon, K. 1982: The determination of combined vinyl acetate in polyvinyl chloride/polyvinyl acetate copolymer by near-infrared photo-acoustic spectrometry and diffuse reflectance spectrometry Analytica Chimica Acta 136: 373-377
In the realm of chemistry, chemical reactions stand as one of the most miraculous phenomena in the universe. Among them, the alcoholysis reaction of vinyl acetate—a process that appears straightforward at first glance—actually embodies a wealth of scientific knowledge and profound philosophical reflections. It is not only a classic case in organic chemistry but also a deep mirror reflecting both natural laws and human society. This article delves into the alcoholysis reaction of vinyl acetate, uncovering its underlying scientific principles, experimental conditions, potential influencing factors, and practical significance.
Vinyl acetate is a common organic compound whose molecular structure contains both a carboxylic acid group and an alkoxy group. Compounds with such structures hold critical roles in numerous industrial applications, such as solvents and plasticizers. vinyl acetate is chemically unstable and prone to various reactions. Among these, the alcoholysis reaction represents a key pathway, involving intermolecular interactions and energy transfer.
The alcoholysis reaction refers to the process by which an organic molecule (an alcohol) interacts with another organic molecule (a carboxylic acid) through hydrogen bonding to form a new compound. During this process, the hydroxyl group of the alcohol molecule and the carbonyl group of the carboxylic acid molecule attract each other via hydrogen bonds, enabling the two molecules to combine into a new, stable compound. This reaction has widespread applications in organic synthesis, such as polymer preparation and pharmaceutical intermediate production.
In studying the alcoholysis reaction of vinyl acetate, scientists must first understand its mechanism. According to existing research, this reaction typically proceeds under acidic conditions, with an acid serving as a catalyst. The acid provides protons to the carboxylic acid molecule, ionizing its carbonyl group. Subsequently, the hydroxyl group of the alcohol molecule forms a new compound with the carbonyl ion through hydrogen bonding.
this process is far from smooth. In reality, the alcoholysis reaction of vinyl acetate is influenced by multiple factors. First, temperature plays a crucial role. Generally, increasing the reaction temperature accelerates the reaction rate, as higher temperatures provide more energy, facilitating interactions between reactants. excessively high temperatures may also induce side reactions, reducing the yield of the target product.
Second, solvent selection significantly impacts the reaction outcome. Different solvents possess varying polarity, dielectric constants, and viscosities, which affect the solubility and interaction modes of the reactants. choosing an appropriate solvent is vital for improving reaction efficiency and selectivity.
Additionally, catalyst selection is another critical factor. While common catalysts include acids and bases, different types may yield varying catalytic effects. Thus, selecting a catalyst requires balancing its activity, selectivity, and stability.
Finally, reaction time cannot be overlooked. Extending the reaction time typically increases product yield, but it also raises energy consumption and costs. Balancing efficiency and economic feasibility is essential.
the alcoholysis reaction of vinyl acetate is a complex process influenced by multiple factors. Through meticulous research and control of these factors, reaction efficiency and selectivity can be effectively enhanced, providing robust support for scientific research and industrial production.
