Quantitative analysis of isoprene units in natural rubber and synthetic polyisoprene using 1H-NMR spectroscopy with an internal standard

Surakit Tuampoemsab; Adun Nimpaiboon; Jitladda T. Sakdapipanich

doi:10.1016/j.polymertesting.2015.02.003

Quantitative analysis of isoprene units in natural rubber and synthetic polyisoprene using ¹H-NMR spectroscopy with an internal standard

Department of Chemistry

King Mongkut's University of Technology North Bangkok
Mahidol University

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Isoprene units in natural rubber (NR) and its synthetic analogues were quantified by ¹H-NMR spectroscopy using polyethylene glycol (PEG) as an internal standard. The effect of PEG and rubber concentrations, molar ratio of rubber/PEG, measuring temperature and scan number on the quantification was investigated to establish the respective working range. Analysis of commercial grades of NR revealed that the differences in 1,4 isoprene content is caused by the production process and feedstock, in which proteins and lipids were found to be the major impurity in NR. Gel fraction of NR has insignificant effect on the measurement of 1,4 isoprene content. Furthermore, the new method was found to produce good results for the quantification of 1,4 and 3,4 units of synthetic polyisoprenes.

Original language	English
Pages (from-to)	21-26
Number of pages	6
Journal	Polymer Testing
Volume	43
DOIs	https://doi.org/10.1016/j.polymertesting.2015.02.003
Publication status	Published - May 2015

Keywords

H-NMR
Isoprene content
Natural rubber
Polyethylene glycol
Synthetic polyisoprene

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10.1016/j.polymertesting.2015.02.003

Cite this

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title = "Quantitative analysis of isoprene units in natural rubber and synthetic polyisoprene using 1H-NMR spectroscopy with an internal standard",

abstract = "Isoprene units in natural rubber (NR) and its synthetic analogues were quantified by 1H-NMR spectroscopy using polyethylene glycol (PEG) as an internal standard. The effect of PEG and rubber concentrations, molar ratio of rubber/PEG, measuring temperature and scan number on the quantification was investigated to establish the respective working range. Analysis of commercial grades of NR revealed that the differences in 1,4 isoprene content is caused by the production process and feedstock, in which proteins and lipids were found to be the major impurity in NR. Gel fraction of NR has insignificant effect on the measurement of 1,4 isoprene content. Furthermore, the new method was found to produce good results for the quantification of 1,4 and 3,4 units of synthetic polyisoprenes.",

keywords = "H-NMR, Isoprene content, Natural rubber, Polyethylene glycol, Synthetic polyisoprene",

author = "Surakit Tuampoemsab and Adun Nimpaiboon and Sakdapipanich, \{Jitladda T.\}",

year = "2015",

month = may,

doi = "10.1016/j.polymertesting.2015.02.003",

language = "English",

volume = "43",

pages = "21--26",

journal = "Polymer Testing",

issn = "0142-9418",

publisher = "Elsevier Ltd.",

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T1 - Quantitative analysis of isoprene units in natural rubber and synthetic polyisoprene using 1H-NMR spectroscopy with an internal standard

AU - Tuampoemsab, Surakit

AU - Nimpaiboon, Adun

AU - Sakdapipanich, Jitladda T.

PY - 2015/5

Y1 - 2015/5

N2 - Isoprene units in natural rubber (NR) and its synthetic analogues were quantified by 1H-NMR spectroscopy using polyethylene glycol (PEG) as an internal standard. The effect of PEG and rubber concentrations, molar ratio of rubber/PEG, measuring temperature and scan number on the quantification was investigated to establish the respective working range. Analysis of commercial grades of NR revealed that the differences in 1,4 isoprene content is caused by the production process and feedstock, in which proteins and lipids were found to be the major impurity in NR. Gel fraction of NR has insignificant effect on the measurement of 1,4 isoprene content. Furthermore, the new method was found to produce good results for the quantification of 1,4 and 3,4 units of synthetic polyisoprenes.

AB - Isoprene units in natural rubber (NR) and its synthetic analogues were quantified by 1H-NMR spectroscopy using polyethylene glycol (PEG) as an internal standard. The effect of PEG and rubber concentrations, molar ratio of rubber/PEG, measuring temperature and scan number on the quantification was investigated to establish the respective working range. Analysis of commercial grades of NR revealed that the differences in 1,4 isoprene content is caused by the production process and feedstock, in which proteins and lipids were found to be the major impurity in NR. Gel fraction of NR has insignificant effect on the measurement of 1,4 isoprene content. Furthermore, the new method was found to produce good results for the quantification of 1,4 and 3,4 units of synthetic polyisoprenes.

KW - H-NMR

KW - Isoprene content

KW - Natural rubber

KW - Polyethylene glycol

KW - Synthetic polyisoprene

UR - https://www.scopus.com/pages/publications/84923872495

U2 - 10.1016/j.polymertesting.2015.02.003

DO - 10.1016/j.polymertesting.2015.02.003

M3 - Article

AN - SCOPUS:84923872495

SN - 0142-9418

VL - 43

SP - 21

EP - 26

JO - Polymer Testing

JF - Polymer Testing

ER -

Quantitative analysis of isoprene units in natural rubber and synthetic polyisoprene using ¹H-NMR spectroscopy with an internal standard

Abstract

Keywords

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