1、Determination of the Vinyl Acetate Content of Ethylene
Standard Test Method for Determination of the Vinyl Acetate Content of Ethylene-Vinyl Acetate (EVA) Copolymers by Fourier Transform Infrared Spectroscopy (FT-IR)
2、Direct determination of vinyl acetate content of ethylene
An infrared spectroscopic method was developed for the determination of vinyl acetate content in thick films of ethylene-vinyl acetate copolymers. The A 3460 /A 3610 ratio was used for the quantitative analysis.
3、Spectroscopic Analysis of Vinyl Acetate Copolymers: An In
Calculate the ratio of the peak areas to determine the relative vinyl acetate content. A calibration curve with standards of known composition is necessary for accurate quantification.
Determination of vinyl acetate content of EVA by TG
In the present investigation, the polymeric layers, Ethylene Vinyl Acetate (EVA), back-sheet, and other materials were recovered using single organic solvent toluene.
Determination of the Vinyl Acetate Content Using
Vinyl acetate, VAc, decomposes between 200 °C and 400 °C with loss of acetic acid. This degradation step can be used to calculate the VAc content in copolymers (EVA types) provided the sample shows no additional weight loss in this temperature range.
国家标准
中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
(PDF) Quantitative determination of the vinylacetate content in
The various methods for the determination of the vinylacetate (VA) content in any ethylene vinylacetate copolymer are examined critically. Each available method is described briefly, together with its relative accuracy. All methods give comparable
ASTM D5594 Vinyl Acetate Content of Ethylene
This ASTM D5594 test method includes internal corrections for sample thickness, as well as infrared techniques for determining the vinyl acetate content of EVA copolymers utilizing pressed films or molded plaques. A reference should be made to the specification of the material being tested.
Quantitative Determination of Vinyl Acetate Content of Ethylene
Quantitative Determination of Vinyl Acetate Content of Ethylene-Vinyl Acetate Copolymers by High-Resolution Nuclear Magnetic Resonance. Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals.
ANALYTICAL METHODS
The purpose of this chapter is to describe the analytical methods that are available for detecting and/or measuring and monitoring vinyl acetate in environmental media and in biological samples.
In the chemical industry, vinyl acetate is a critical organic compound widely used in coatings, plastics, adhesives, and other fields. Due to its unique properties and broad application prospects, accurately measuring the content of vinyl acetate is essential for ensuring product quality. This article provides a detailed introduction to the detection methods for vinyl acetate content.
I. Theoretical Basis
Vinyl acetate (CH₂=C(CH₃)COOCH₃) is a colorless liquid with a fragrant odor, a melting point of -18°C, and a boiling point of 67-69°C. It is synthesized via the addition polymerization reaction of ethylene and acetic acid, containing a carbon-carbon double bond and an acetoxy functional group.
II. Overview of Detection Methods
The determination of vinyl acetate content primarily relies on chromatographic analysis. Chromatography separates substances based on their relative movement speeds in stationary and mobile phases. For vinyl acetate, gas chromatography (GC) is the most commonly used method.
III. Experimental Procedure
1. Sample Preparation
Accurately weigh a specific amount of the sample, typically expressed as a mass percentage. Ensure the sample is fully dissolved and diluted to an appropriate concentration for analysis.
2. Chromatographic Condition Setup
Select a suitable chromatographic column and detector based on the sample’s characteristics. For vinyl acetate, columns packed with polydimethylsiloxane (PDMS) as the stationary phase and high-selectivity reverse-phase silica gel as the mobile phase are commonly used. Optimize detector sensitivity by adjusting hydrogen and air flow rates to achieve optimal separation of the target compound.
3. Sample Injection and Analysis
Inject the prepared sample into the chromatograph via the injection port. The chromatographic column separates components based on volatility and polarity, and the detector measures the signal intensity of each component.
4. Data Processing
Integrate the chromatographic data to calculate the mass percentage of each component. Use external standardization or internal standardization methods for quantitative analysis of unknown samples to improve accuracy.
IV. Key Considerations
- Sample Pretreatment: Ensure sample representativeness and homogeneity to avoid biased results due to impurities.
- Chromatographic Optimization: Adjust conditions (e.g., column type, temperature, flow rate) based on sample properties and analytical goals.
- Standardized Operation: Follow protocols strictly for sample handling, injection, and detection to ensure safety and reliability.
- Instrument Maintenance: Regularly calibrate and maintain the chromatograph to guarantee stable performance.
Determining vinyl acetate content requires careful consideration of sample properties, chromatographic conditions, and operational norms. Through scientific methods and strict quality control, accurate measurement of vinyl acetate can be achieved, providing robust support for chemical product manufacturing and quality assurance.
