Geometrical isomerisation of polyisoprenes. Pt. 1. Occurrence and estimation of trans-alkene functionality in natural rubber


Citation

Farley P. S., . Geometrical isomerisation of polyisoprenes. Pt. 1. Occurrence and estimation of trans-alkene functionality in natural rubber. pp. 215-222. ISSN 0127-7065

Abstract

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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Abstract

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.

Additional Metadata

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Item Type: Article
AGROVOC Term: Natural rubber
AGROVOC Term: Hevea rubber
AGROVOC Term: Polymers
AGROVOC Term: Isomerization
AGROVOC Term: NMR spectroscopy
AGROVOC Term: Evaporation
AGROVOC Term: Measurement
AGROVOC Term: Molecular weight
AGROVOC Term: Physical properties
AGROVOC Term: Hevea brasiliensis
Geographical Term: Malaysia
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 28 Apr 2025 04:43
URI: http://webagris.upm.edu.my/id/eprint/23486

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