GB/T 16867-1997 Determination of residual styrene monomer in polystyrene and acrylonitrile-butadiene-styrene resins by gas chromatography
1 Application scope
This standard specifies the methods for the determination of residual styrene monomer (St) in polymers by Solution Injection Gas Chromatography (Method A) and Headspace Gas chromatography (Method B), both of which have the same effect.
This standard is applicable to the determination of residual styrene monomers in polystyrene (PS) and acrylonitrile-butadiene-styrene resins (ABS). This standard is also applicable to the determination of residual styrene monomers in styrene-acrylonitrile copolymer (SAN) and impact-resistant polystyrene (HIPS).
This standard is also applicable to the determination of other volatile organic components in the above-mentioned styrene-based resins, such as ethylbenzene (EB), isopropylbenzene (i-PB), o-Xylene, n-propylbenzene (n-PB), methylethylbenzene (MEB), and α -methylstyrene (α-MS).
2 Reagents and materials
2.1 N, N-dimethylformamide (DMF) or N, N-dimethylacetamide (DMAC): There shall be no solvent impurity chromatographic peaks at the retention times of the component under determination and the internal standard in the chromatogram.
2.2 N-butylbenzene: with a purity not less than 99%.
2.3 Styrene, ethylbenzene, isopropylbenzene, o-xylene, n-propylbenzene, methylethylbenzene, α -methylstyrene: with a purity not less than 99%.
2.4 Nitrogen: with a purity not less than 99.95%.
2.5 Hydrogen: with a purity not less than 99.8%. Before use, it shall be purified using a dehydration device, silica gel, molecular sieve or activated carbon.
2.6 Air: It shall be free of corrosive impurities. It shall be dehydrated and deoiled before use.
3 Samples
Take PS or ABS particles and mix them thoroughly as laboratory samples, then seal them for future use.
4 Method A: Solution injection method
4.1 Method summary
The polymer samples are dissolved or swollen in N, N-dimethylformamide (DMF) or N, N-dimethylacetamide (DMAC) solvents, which contains a known amount of n-butylbenzene as an internal standard. Draw an appropriate amount of the solution with a microsyringe and directly inject it into the chromatograph to separate styrene from other components under determination such as ethylbenzene and n-propylbenzene, as well as the internal standard, and conduct quantitative determination.
Foreword i
1 Application scope
2 Reagents and materials
3 Samples
4 Method A: Solution injection method
5 Method B: Headspace method
6 Test report
Annex A (Informative) Typical gas chromatograms of PS and ABS samples
