. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . e le xylol passant danslosmogene se charge de matieres £trangeres et on arrete lorsquilnentrame sensiblement plus rien. Le caoutchouc est alors dissous clans le xylol, et la presquetotalite du soufre quil contenait est enleve; une quantite relative-ment faible du soufre combine reste neanmoins fixee au caout-chouc, qui ne peut etre otee. Nous avons analyse ailleurs le mecanisme de la dissociationdu sulfure de polyprene, et nous ny reviendrons pas; disonsseulement que la liberation d
. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . e le xylol passant danslosmogene se charge de matieres £trangeres et on arrete lorsquilnentrame sensiblement plus rien. Le caoutchouc est alors dissous clans le xylol, et la presquetotalite du soufre quil contenait est enleve; une quantite relative-ment faible du soufre combine reste neanmoins fixee au caout-chouc, qui ne peut etre otee. Nous avons analyse ailleurs le mecanisme de la dissociationdu sulfure de polyprene, et nous ny reviendrons pas; disonsseulement que la liberation de soufre et de gomme pure est ac-compagnee dune regression des sulfures restants, qui tendent versle sulfure de diisoprene C10H16S2, ou ebonite; ce corps totalementinsoluble, ne se trouve dailleurs quen petite quantite, et sajouteaux charges du caoutchouc qui sont ecartees de la solution parcentrifugation. La dissolution est ensuite evaporee a basse temperature souspression reduite, et la gomme ainsi obtenue constitue un regenereemployable en labsence complete de gommes naturelles, et aumeme titre AN INVESTIGATION INTO THE NATURE ANDPROPERTIES OF HEVEA LATEX Clayton Beadle and Dr. Henry P. StevensLondon Bridge, S. E., London, Eng. Part I Physical Properties and Coagulation of Hevea Latex The observations recorded in this paper were made in partby one of us on fresh latex in the East and partly with latexbrought home, with the addition of preservatives. Of previouswork on this subject the most important is that 1 carried outin Europe by V. Henri with preserved latex, but the methodof preservation is not stated. We are only told that the latexhad a faint alkaline reaction. Now latex as it exudes from thetree occasionally shows a slightly alkaline reaction when neutrallitmus paper is pressed on to a drop as it exudes from a freshcut. The reaction however is not invariably alkaline, it maybe neutral, or even faintly acid owing to the inclusion of sapfrom the vessels whic
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