The equilibrium melting temperature of cis-polyisoprene

The equilibrium melting temperature T° m of cis-polyisoprene ( Hevea natural rubber) has been determined to be 35.5°C at atmospheric pressure. The optical ‘turbidimetric’ technique developed to obtain the melting data, discussed in this paper, utilized unpolarized light and was free of complications...

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Bibliographic Details
Published in:Polymer (Guilford) 1983-12, Vol.24 (12), p.1623-1630
Main Authors: Dalal, E.N., Taylor, K.D., Phillips, P.J.
Format: Article
Language:English
Subjects:
Applied sciences
crystal
equilibrium
Exact sciences and technology
melting
Natural polymers
Natural rubber
Physicochemistry of polymers
Polyisoprene
rubber
thickening
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Summary:The equilibrium melting temperature T° m of cis-polyisoprene ( Hevea natural rubber) has been determined to be 35.5°C at atmospheric pressure. The optical ‘turbidimetric’ technique developed to obtain the melting data, discussed in this paper, utilized unpolarized light and was free of complications (presumably involving melt strain) encountered with polarized light techniques, but was found to be consistent with that and other techniques. The effect of variables such as heating rate and crystallization time were considered. Two independent methods of extrapolation of the T m data to evaluate T° m produced values in the range T° m = 35.5° ± 0.3°C. The fold surface free energy σ e was also estimated, by two independent methods, to be 0.024 J m −2.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(83)90182-9