Vinyl chloride/vinyl acetate copolymer

• CAS: 9003-22-9
• Catalog Number: ACM9003229
• Category: Polymer/Macromolecule
• Molecular Weight: 115000
• Molecular Formula: [-CH₂CH(Cl)-]x[-CH₂CH(O₂CCH₃)-]y
• Density: 1.36 (20°C)
• Alpha Sort: Vinyl chloride/vinyl acetate copolymer
• Viscosity: 1,250cp (20 wt% in MEK)

Case Study

Preparation of Modified Polyvinyl Chloride-Vinyl Acetate Copolymer Membrane

Wenjuan, Li, et al. Energy Procedia 5 (2011): 1158-1162.

A chemical modification method successfully improved the hydrophilic properties of polyvinyl chloride-vinyl acetate copolymer (VC-co-VAc) in this work.
Preparation Process
The alcoholysis of VC-co-VAc was carried out using NaOH as a catalyst and methanol as a reagent, introducing hydrophilic groups into the molecular framework. The resulting VC-co-VAc-OH copolymer was dissolved in DMAC with PEG 20000 as an additive to create a casting solution. This solution was stirred for four hours at 60 °C, then transferred to a vacuum oven at the same temperature for two days to eliminate bubbles. The phase inversion technique was employed to create membranes after the previous steps.
Performance of the Modified Membrane
A membrane exhibiting optimal performance was achieved with a polymer concentration of 16 wt.%, a solvent-to-additive mass ratio of 10:1, a coagulation temperature of 20 °C, an evaporation time of 30 seconds, and a relative humidity of 50%. These findings were corroborated by experimental data on pure water flux, retention, water content, and pore size distribution.

Nanomaterial-Reinforced Polyvinyl Chloride/Vinyl Acetate Copolymer as Anticorrosion Coating

Calhoun, M., et al. Journal of Applied Polymer Science 119.1 (2011): 15-22.

Steel substrates received a coating of poly(vinyl chloride/vinyl acetate) copolymer (VYHH) and VYHH reinforced with multiwalled carbon nanotubes (MWCNTs) to assess their effectiveness as corrosion barriers. Researchers evaluated both the electrical impedance properties and thermal behavior of the coatings.
Evaluation Method
The coating mix contained 0.1% MWCNT measured by weight. The polished and degreased steel substrates received coatings by dipping them into both neat and MWCNT-filled VYHH solutions. The steel substrates received one dip for a coating thickness of 30-40 μm or two dips to obtain a coating thickness of 60-75 μm. For 45 days the samples which were coated and uncoated control specimens were submerged in a 5% NaCl solution.
Key Findings
The measurement results from electrochemical impedance spectroscopy showed that coating thickness affects corrosion resistance by demonstrating that nano-reinforced VYHH coatings achieved the greatest charge transfer resistance at their specific thickness. The application of Fourier transform infrared spectroscopy (FTIR) revealed that hydrolysis occurred in both the neat coating and its reinforced version. Adding the nanophase to the material resulted in less hydrolysis compared to the neat version. Thermal stability of VYHH improved with the addition of MWCNTs according to results from differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). DSC thermograms revealed that nano-reinforced VYHH maintained consistent thermal properties after 45 days of immersion when compared to unaged versions.