ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The selectivity of the three different double bonds (CIS, TRANS and VINYL) of hydroxyterminated polybutadiene regarding epoxidation was evaluated, using m-chloroperbenzoic acid in toluene below room temperature (-10°C, -5°C, 0°C and 5°C). To determine the kinetic constants for the three configuratons (k1,cis = (2,59-0,6) × 10-2 L · mol-1 · min-1; k2, trans = (5,35-0,82) × 10-2 L · mol-1 · min-1; k3, vinyl = (0,97-0,01) × 10-2 L · mol-1 min-1), 1H and 13C NMR was used along with a system of three parallel equations. The activation energy values were also evaluated (Ea, cis = 53,9 kJ · mol-1; Ea, trans = 70,7 kJ · mol-1 and Ea, vinyl = 261,1 kJ · mol-1) for the three double bond types.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1994.021951219
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