โ Scribed by David R. Burfield; Kooi-Ling Lim; Kia-Sang Law
No coin nor oath required. For personal study only.
Studies in the epoxidation of natural rubber latices are described. Investigated epoxidation routes include the use of bromohydrin intermediates, hydrogen-peroxide-catalyzed systems, and preformed peracetic acid. The latter reagent allows almost quantitative epoxidation of natural rubber up to high modification levels with no detectable side reactions. Kinetic studies show that the peracetic acid epoxidation is second order in peracid and rubber hydrocarbon with an overall activation energy of 56.2 kJ/mol. Epoxidation leads to a progressive increase in Tg and polymer density with increase in modification level. The effects of modification on solvent swelling and mechanical properties of the DICUP-crosslinked rubbers are reported.
๐ SIMILAR VOLUMES
## Abstract Oxidative degradation of epoxidized natural rubber (ENR) was effectively performed in latex phase by using periodic acid at 30ยฐC. The ENR was prepared from the epoxidation of natural rubber in latex phase using performic acid generated __in situ__ by the reaction of hydrogen peroxide an
Two sets (A and B) of bisphenol Aยฑdiglycidyl ether (DGEBA) based epoxy resin formulations were modiยฎed with epoxidized natural rubber (ENR 50) and its liquid version (LENR 50), and cured with amino propoxylate initiator/accelerator at ambient temperatures. The ENR 50 loading range was 1.6ยฑ5.9 wt%. B
## Abstract The rheological behavior of natural rubber (NR) and carboxylated styrene butadiene rubber (XSBR) latices and their blends was investigated, with special reference to the effect of shear rate, temperature, and blend ratio. Arrhenius plots of the blends were drawn and the temperature sens