Characterization of Ethylene-Vinyl Acetate Copolymer by Eluent Gradient HPLC

Kagawa, Nobuyuki; Okazaki, Reiko; Itou, Akira

doi:10.2116/bunsekikagaku.59.793

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…The limited solubility of EVA18 in CHCl 3 concomitantly to desorption and ionization issues undoubtedly account for such bias. The VA content has been previously found not to vary with the molecular weight using high‐performance liquid chromatography (HPLC) measurements and we obtained similar results with a steady VA content calculated for fractions #1 and #3 (as shown in Supplementary Figs. S3 and S4, Supporting Information).…”

Section: Resultssupporting

confidence: 88%

MALDI SpiralTOF high‐resolution mass spectrometry and Kendrick mass defect analysis applied to the characterization of poly(ethylene‐co‐vinyl acetate) copolymers

Fouquet

Nakamura

Sato

2016

Rapid Comm Mass Spectrometry

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RationalePoly(ethylene‐co‐vinyl acetate) copolymers – usually referred to as EVA – are first class industrial polymers used for applications ranging from padding to photovoltaics as encapsulant for the silicon solar cells. Various techniques have been used for their characterization but the analysis of intact EVA chains using mass spectrometry (MS) has not been reported so far.MethodsThree copolymers containing 18, 25 and 40 wt% vinyl acetate (VA) have been characterized using an off‐line coupling of size‐exclusion chromatography (SEC) and matrix‐assisted laser desorption/ionization (MALDI) spiral‐time‐of‐flight (TOF) high‐resolution mass spectrometry (HRMS). The representativeness of those results for the entire samples has been checked using 13C NMR spectroscopy. Lastly, Kendrick mass defect analysis has been proposed as an alternative and user‐friendly data treatment method.ResultsThe shortest chains isolated by SEC fractionation and mass‐analyzed by HRMS have been thoroughly described in terms of end‐groups (found to be hydrogens) and co‐monomeric composition. The VA content was successfully derived from the peak assignments in MS spectra for the EVA 40 wt% and 25 wt% while it tended to be overestimated for the latest EVA 18 wt% (increasing poly(ethylene) character). Similar results have been found using a faster data treatment method relying on the Kendrick mass defect analysis of the MS data.ConclusionsEVA low molecular weight intact oligomers have been extensively characterized by MS for the first time and the structural features confidently extended to the full sample according to NMR data. The Kendrick mass analysis finally constituted an efficient method for a fast evaluation of their VA content with no need for manual assignment. © 2016 The Authors. Rapid Communications in Mass Spectrometry Published by John Wiley & Sons Ltd.

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Section: Resultssupporting

confidence: 88%

MALDI SpiralTOF high‐resolution mass spectrometry and Kendrick mass defect analysis applied to the characterization of poly(ethylene‐co‐vinyl acetate) copolymers

Fouquet

Nakamura

Sato

2016

Rapid Comm Mass Spectrometry

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Mono-molecular Polystyrene^|^apos;s Size in a Dilute Solution and in an Extractive or Evaporative Solid State from a Dilute Dolution

Takatori

Matsumoto

Adachi

et al. 2014

Journal of the Society of Rubber Industry, Japan

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We observed a relationship between the size of one polystyrene (PS) molecule in a dilute solution and in an extractive or evaporative solid state prepared from a PS dilute solution. In the both cases we observed the scaling relationship between the molecular weight and the molecular size. And the distributions of these sizes were also almost same. Though the scaling exponent was about 0.6 in the dilute solution, the exponent of the mono-molecule solid PS was 0.6 below Mw=7.5×10 6 and 0.33 above Mw=7.5×10 6. This was consistent with the experimental result that the ELSD (evaporative light scattering detector) peak area of a PS solution became lower above a critical molecular weight even if the PS mass concentration was same. Above a critical molecular weight the PS mono-molecular solid particle would shrink smaller than the value which was speculated form the size in the dilute solution.

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Characterization of Copolymer by 2D-HPLC Method

Kagawa

2015

Journal of the Japan Society of Colour Material

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Characterization of Ethylene-Vinyl Acetate Copolymer by Eluent Gradient HPLC

Cited by 4 publications

References 7 publications

MALDI SpiralTOF high‐resolution mass spectrometry and Kendrick mass defect analysis applied to the characterization of poly(ethylene‐co‐vinyl acetate) copolymers

MALDI SpiralTOF high‐resolution mass spectrometry and Kendrick mass defect analysis applied to the characterization of poly(ethylene‐co‐vinyl acetate) copolymers

Mono-molecular Polystyrene^|^apos;s Size in a Dilute Solution and in an Extractive or Evaporative Solid State from a Dilute Dolution

Characterization of Copolymer by 2D-HPLC Method

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