NMR Investigations of Branch Structure in Ethylene-Vinyl Chloride Copolymer.

Niwa, Hiroshi; Nagata, Masatoshi

doi:10.1295/koron.52.718

Cited by 2 publications

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“…The four EVC and their reduced products are the same materials used in the previous work, 7 and the nine PVC samples were synthesized under basically the same polymerization conditions for the EVCs except for the feeded monomer. The nine PVC samples are also reductively dehalogenated into the PE skeletal structures by using tri-n-butyltin hydride (Bu 3 SnH) with basically the same procedure reported elsewhere.…”

Section: Samplementioning

confidence: 99%

“…In this work, high-resolution Py-HGC was applied to develop a new practical method to determine the amounts of the SCB in PVC and EVC where reductively dehalogenated PVC and EVC samples prepared by using basically the same way reported in the previous papers 7 was used. Here, various hydrogenation catalysts such as Pt, Pd, and nickel (Ni) were examined for Py-HGC, and various calculation methods were tested for the observed pyrograms to obtain comparable values of the kind and the amount of branches estimated by 13 C NMR.…”

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Determination of Short-Chain Branches in Poly(vinyl chloride) and Ethylene-Vinyl Chloride Copolymers by Pyrolysis-Hydrogenation-Gas Chromatography

Mao

Ohtani

Tsuge

et al. 1999

Polym J

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ABSTRACT:Short-chain branches (SCB) of poly(vinyl chloride) (PVC) and ethylene-vinyl chloride copolymer (EVC) samples were determined by reduction of the samples with tri-n-butyltin hydride(Bu3 SnH) followed by high-resolution pyrolysis-hydrogenation-gas chromatographic measurement in the presence of nickel (Ni) as a hydrogenation catalyst. The branch contents were estimated from the relative peak intensities of characteristic key isoalkanes on the C 10 and C 11 fragment region in the observed pyrograms by comparing the data of reference model ethylene-IX-olefin copolymers with known contents of methyl (C 1 ), ethyl(C 2 ), and butyl (C4 ) branches, respectively. The results obtained by this method were in reasonably good agreement with those found by 13 C NMR. The correlations between polymerization conditions and the SCB contents in the PVC and EVC samples were also discussed. Significant features of the proposed method such as extremely high sensitivity using less than I mg of the sample and rapidness to finish one run in about I h would meet the potential needs for the SCB characterization in various polymers containing chlorine, which were used in practical fields.

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Section: Samplementioning

confidence: 99%

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confidence: 99%