Geometrical isomerisation of polyisoprenes. Pt. 1. Occurrence and estimation of trans-alkene functionality in natural rubber
1991
Farley, P. S.
A procedure to measure low levels of trans-alkene content in samples of natural rubber has been developed based on ‘H-NMR spectroscopy at 400 MHz. Modification levels ranging between 0.20 mole% and 0.79 mole% have been measured in natural rubber originating from a variety of grades of Malaysian rubber. There is no general correlation between trans-alkene content and grade of natural rubber. A combination of ‘spin-counting’ and comparative NMR analyses has demonstrated that the sol and gel phases of natural rubber are homogeneous with both phases containing the same level of trans-alkene content.
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