1、RAFT Copolymerization of Vinyl Acetate and Acrylic Acid in the
The present research reports the gradient polymerization-induced self-assembly in the RAFT copolymerization of vinyl acetate (VAc) and acrylic acid (AA). Vinyl acetate is a “less activated” monomer, while acrylic acid is a “more activated” monomer.
2、On the preparation of acrylic acid/vinyl acetate copolymers with
In the present work, low conversion acrylic acid (AA)/vinyl acetate (VAc) copolymerizations were carried out in azeotropic ethanol/water solutions containing 93% in weight of ethanol. Reactivity ratios were determined by several methods and shown to be equal to rAA = 2.6 and rVAc = 0.04. ELSEVIER PII: S0032-3861 (97)00363-7 Polymer Vol. 39 No.
3、Acrylic Acid/Vinyl Acetate Suspension Copolymerizations. 2. Modeling
The present work presents experimental and modeling results for both vinyl acetate (VAc) homopolymerizations and VAc/acrylic acid (AA) copolymerizations performed in suspension.
4、PET
The tem-poral controllable PET-RAFT polymerization of vinyl acetate (VAc) and acrylic acid (AA) was achieved. The structure of synthesized poly(VAc-co-AA) was characterized by nuclear magnetic resonance spectroscopy (1H NMR) and gel permeation chromatography (GPC), respectively.
Acrylic Acid/Vinyl Acetate Suspension Copolymerizations
The monomer reactivity ratios and the AA partition coefficients between the organic and aqueous phases are evaluated experimentally. The proposed model is validated with experimental data obtained for monomer conversion, copolymer composition, and molecular weight averages of polymer samples.
Investigation of free
The free-radical copolymerization propagation kinetics of vinyl acetate (VAc) and methyl methacrylate (MMA) at 50 degrees C were investigated through an experimental study combined with a computational analysis based on quantum chemistry.
Copolymerization reaction between vinyl acetate and acrylic acid
In this review paper, we discussed the radio frequency curing technique, their mechanism and troubleshooting to achieve perfect wood bond in joinery segment. ...
Effect of Addition of Various Amounts of Kaolin Clay on the Properties
Conventional free-radical emulsion polymerization was used to prepare a terpolymer of vinyl acetate (VAc), butyl acrylate (BA), and acrylic acid (AA). 1H NMR analysis confirmed the successful preparation of the terpolymer.
Binary reactivity ratios (from literature) and ternary reactivity ratio
This investigation introduces the first estimation of ternary reactivity ratios for a butyl acrylate (BA), 2-methylene-1,3-dioxepane (MDO), and vinyl acetate (VAc) system at 50 °C,...
Acrylic Acid/Vinyl Acetate Suspension Copolymerizations. 2. Modeling
To read the full-text of this research, you can request a copy directly from the authors. The present work presents experimental and modeling results for both vinyl acetate (VAc)...
In the field of chemistry, the reactivity ratio (Kp) is a critical parameter that quantifies the competitive ability of two or more monomers during polymerization. It not only determines the properties of the resulting polymer but also significantly impacts production processes and cost control. This paper explores the reactivity ratios of vinyl acetate (VAc) and acrylic acid (AA), along with their performance in practical applications.
1. Definition and Importance of Reactivity Ratios
The reactivity ratio represents the probability ratio of two or more monomers undergoing simultaneous polymerization under identical conditions. For VAc and AA, this ratio reflects their competitive incorporation into copolymer chains during synthesis. A higher reactivity ratio indicates a greater likelihood of concurrent polymerization, directly influencing the polymer’s structure and properties.
2. Physicochemical Properties of VAc and AA
VAc is a widely used thermoplastic elastomer known for its flexibility, wear resistance, and tear strength. AA, meanwhile, is a prevalent polymer material characterized by excellent electrical insulation, chemical resistance, and mechanical robustness. Both monomers are extensively applied in industries such as packaging materials, wire insulation, and coatings.
3. Methods for Calculating Reactivity Ratios
Accurate determination of the reactivity ratios between VAc and AA relies on experimental data or empirical formulas. Common techniques include solution titration, nuclear magnetic resonance (NMR) spectroscopy, and infrared (IR) spectroscopy. By comparing the reaction rates of the monomers under varying conditions, their reactivity ratios can be derived.
4. Impact of Reactivity Ratios on Polymer Performance
The reactivity ratios of VAc and AA profoundly affect the physicochemical properties of their copolymers. For instance, higher reactivity ratios may reduce crystallinity, altering mechanical properties. Additionally, these ratios influence thermal stability, solvent resistance, and aging resistance. Understanding these parameters is essential for optimizing manufacturing processes and enhancing product performance.
5. Considerations in Practical Applications
Engineers must balance reactivity ratios with other factors, such as polymerization conditions, molecular weight distribution, and processing techniques. By fine-tuning these variables, high-performance and cost-effective VAc-AA copolymers can be achieved.
The reactivity ratios of VAc and AA are pivotal to the properties of their copolymers. Mastery of calculation methods and influencing factors provides scientific foundations for industrial production and drives innovation in material development. With advancements in technology, future research may uncover new methodologies to further elucidate these reactivity ratios.
Keywords: Vinyl acetate, Acrylic acid, Reactivity ratio, Copolymerization, Polymer properties.
