Distribution and origin of abnormal groups in natural rubber
1997
Eng, A. H. | Tangpakdee, Jitladda | Kawahara, S. | Tanaka, Y.
Ester and aldehyde groups are found to remain in natural rubber even after purification by deproteinisation and acetone extraction. Rubber isolated from smaller latex particles in the serum fraction contains a lower level of ester+ group than that from larger latex particles. Both aldehyde and ester groups are found to have a similar distribution in fractionated natural rubbers of different molecular weights. The concentration of these groups decreases with decreasing molecular + weight of the rubbers. This finding suggests that the aldehyde groups are not derived from oxidative degradation of natural rubber. A drastic reduction in aldehyde content of natural rubber after transesterification is observed showing that the aldehyde + groups are derived from oxidative degradation of olefinic group of unsaturated fatty acids bonded to the rubber molecule.
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