Advances in Catalysis, Vol. 2 by W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

By W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

With this moment quantity of Advances in Catalysis, the editors have persevered their efforts to provide the numerous points of the catalytic strategy. a few hugely certified males have contributed to this quantity. From the theoretical remedies of straightforward tactics among molecules reacting at sturdy surfaces to the technically very important activities of fluoride catalysts, and to catalytic polymerizations of olefins, the reader turns into familiar with manifold rules and with a few commonplace experimental effects in relation to catalytic phenomena. Our loss of a whole realizing of catalytic motion, and our corresponding lack of ability to ''predict'' the way of accomplishing a wanted catalytic response, make it necessary for everybody operating during this path to familiarize himself with the event of others, no matter if such event used to be collected in distant sectors of this large box.

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With a silica-alumina catalyst under unspecified conditions, these investigators obtained a polymer about 50% of which was hexenes. The main component of the hydrogenated product was 2-methylpentane. + H+ C=C-C + + c=c-c c-c-c +I1 c-c-c-c-c t: C-C=C-C-C A XVII A C + c=c-c c-c-c-c5-c-c-c AA 11 C-C-C-C=C-C-C b b Ge c-c-c-A-c-6-c c: I t c =? (36) c-c-c-A-6-c-c + H+ + H+ (37) C c-c-c-A+ + b e C-C-&-C-C A (35) ec-c-c-c-c XVI C-C-C-6-C 4. C-C-C t: THE MECHANISM O F THE POLYMERIZATION O F ALKENES 37 The reason for the low yield of hexene and high yield of nonene apparently lies in the relative reactivity of the 2-methyl-2-pentene and the original propene.

21 1. Scope . . . . . . . . . . . . . 21 .............. 2. Preliminary Survey.. 11. Free Radical-initiated Polymerization 111. True Polymerization. . . . . . ......... 3. Methyl Separation Separation M Mechanism. . . . . . . . . ............... ........... V. Macropolymerization a t Low Temperature.. . 1. Boron Fluoride. Fluori . 2. Titanium Tetrachlor .................................... 62 71 75 .

The peroxide-induced polymerization of ethylene under 200-300 atmospheres pressure in the presence of a solvent yields a high molecular weight polymer (Staff Report, 7). 3% oxygen is obtained in the presence of methanol and benzoyl peroxide at 110-120". 1 % oxygen yields a harder polymer of 15,000-20,000 molecular weight and melting a t about 110”. Its extremely good electrical properties account for what is probably its major use, namely, as an electrical insulating material, for example in coaxial cables.

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