Analysis of epoxidized natural rubber. A comparative study of d.s.c., n.m.r., elemental analysis and direct titration methods |
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Authors: | David R. Burfield Kooi-Ling Lim Kia-Sang Law Soon Ng |
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Affiliation: | Department of Chemistry, University of Malaya, Kuala Lumpur 22-11, Malaysia |
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Abstract: | A comparative analysis of epoxidized natural rubber samples by 1H and 13C n.m.r., titrimetric, elemental and d.s.c. techniques has been made. Whereas the titrimetric method is only applicable at low epoxy contents (< 15 mol%) both n.m.r. methods give reasonable precision over the compositional range of 20–75 mol%. Elemental analysis appears less reliable. D.s.c. analysis through measurement of Tg provides the highest precision of measurement but requires independent calibration by one or more of the primary methods. The epoxy content may also be related to the polymer density. |
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Keywords: | epoxidation natural rubber analysis n.m.r. elemental d.s.c. density |
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