Excerpt:
The leaves of Cryptostegia grandijlora have been investigated as a possible emergency source of rubber, supplementing the latex rubber from the stems, The leaf rubber consists of two distinct portions; 85 to 90% is a relatively low-polymer rubber which occurs in the chloeenchyma cells, and 10 to 15% is a latex rubber or better quality which occurs in the latex ducts. Isolation of the leaf rubber by a combination of fermentation and chemical extraction, and the characterization ot’ vulcanizates are described.
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