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

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 in...

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Bibliographic Details
Published in:Polymer testing 2015-05, Vol.43, p.21-26
Main Authors: Tuampoemsab, Surakit, Nimpaiboon, Adun, Sakdapipanich, Jitladda T.
Format: Article
Language:English
Subjects:
1H-NMR
Isoprene content
Natural rubber
Polyethylene glycol
Synthetic polyisoprene
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Summary: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.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2015.02.003