Refractive index increments of natural and synthetic polyisoprenes


Citation

Fulton W. S., . and Fuller K. N. G., . Refractive index increments of natural and synthetic polyisoprenes. pp. 20-26. ISSN 0127-7065

Abstract

Measurements of the refractive index increment of a variety of Hevea rubber samples and a range of narrow distribution synthetic polyisoprenes have been made at a wavelength of 615 nm and a temperature of 40C. Evidence that the increment decreased with molecular weight at low values (below 100 kg mol-1) was found for both the natural and synthetic materials. Soluble non-rubbers in the natural material were found to act effectively as a diluent. Otherwise there appeared to be little difference between the natural and synthetic polyisoprene; the average values measured for the refractive index increment were respectively 0.135 mig-1 and 0.133 mlg-1. A high molecular weight fraction of natural rubber gave a figure (0.147 mlg-1) well above that obtained for the other natural polyisoprene samples.


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Abstract

Measurements of the refractive index increment of a variety of Hevea rubber samples and a range of narrow distribution synthetic polyisoprenes have been made at a wavelength of 615 nm and a temperature of 40C. Evidence that the increment decreased with molecular weight at low values (below 100 kg mol-1) was found for both the natural and synthetic materials. Soluble non-rubbers in the natural material were found to act effectively as a diluent. Otherwise there appeared to be little difference between the natural and synthetic polyisoprene; the average values measured for the refractive index increment were respectively 0.135 mig-1 and 0.133 mlg-1. A high molecular weight fraction of natural rubber gave a figure (0.147 mlg-1) well above that obtained for the other natural polyisoprene samples.

Additional Metadata

[error in script]
Item Type: Article
AGROVOC Term: Natural rubber
AGROVOC Term: Hevea rubber
AGROVOC Term: Synthetic rubber
AGROVOC Term: Refractive index
AGROVOC Term: Measurement
AGROVOC Term: Temperature
AGROVOC Term: Dissolving
AGROVOC Term: Solvents
AGROVOC Term: Molecular weight
AGROVOC Term: value
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 24 Apr 2025 06:28
URI: http://webagris.upm.edu.my/id/eprint/23493

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