Research article

Latex-state NMR spectroscopy for quantitative analysis of epoxidized deproteinized natural rubber

Kewwarin Sae-heng

orcid.org/0000-0002-9280-8052

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

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Tanongsak Kanya,

Tanongsak Kanya

Department of Material and Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110 Thailand

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Nuorn Choothong,

Nuorn Choothong

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

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Kenichiro Kosugi,

Kenichiro Kosugi

orcid.org/0000-0002-5377-9017

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

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Warunee Ariyawiriyanan,

Warunee Ariyawiriyanan

Department of Material and Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110 Thailand

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Seiichi Kawahara,

Corresponding Author

Seiichi Kawahara

[email protected]

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

Correspondence to: Seiichi Kawahara, Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940–2188, Japan.

E-mail: [email protected]

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Kewwarin Sae-heng,

Kewwarin Sae-heng

orcid.org/0000-0002-9280-8052

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

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Tanongsak Kanya,

Tanongsak Kanya

Department of Material and Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110 Thailand

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Nuorn Choothong,

Nuorn Choothong

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

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Kenichiro Kosugi,

Kenichiro Kosugi

orcid.org/0000-0002-5377-9017

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

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Warunee Ariyawiriyanan,

Warunee Ariyawiriyanan

Department of Material and Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathum Thani, 12110 Thailand

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Seiichi Kawahara,

Corresponding Author

Seiichi Kawahara

[email protected]

Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940–2188 Japan

Correspondence to: Seiichi Kawahara, Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940–2188, Japan.

E-mail: [email protected]

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First published: 24 January 2017

https://doi.org/10.1002/pat.4008

Citations: 4

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Abstract

Method of quantitative analysis through latex-state ¹³C NMR spectroscopy was established for in situ determination of epoxy group content of epoxidized natural rubber in latex stage. The epoxidized natural rubber latex was prepared by epoxidation of deproteinized natural rubber with freshly prepared peracetic acid in latex stage. The resulting epoxidized deproteinized natural rubber (EDPNR) latex was characterized through latex-state ¹³C NMR spectroscopy. Chemical shift values of signals of latex-state ¹³C NMR spectrum for EDPNR were similar to those of solution-state ¹³C NMR spectrum for EDPNR. Resolution of latex-state ¹³C NMR spectrum was gradually improved as temperature for the nuclear magnetic resonance (NMR) measurement increased to 70°C. Signal-to-noise ratio of latex-state ¹³C NMR measurement was similar to that of solution-state ¹³C NMR measurement at temperature above 50°C. The epoxy group content determined through latex-state NMR spectroscopy was proved to be the same as that determined through solution-state NMR spectroscopy. Copyright © 2017 John Wiley & Sons, Ltd.

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Volume28, Issue9

September 2017

Pages 1156-1161

Latex-state NMR spectroscopy for quantitative analysis of epoxidized deproteinized natural rubber

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Latex-state NMR spectroscopy for quantitative analysis of epoxidized deproteinized natural rubber

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