ISSN:
1573-9171
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 1. Thermal polymerization of dimethyl butene under pressures of about 4000 kg/cm2 was studied. 2. A conclusion about the stepwise character of this reaction was drawn on the basis of investigation of the kinetics of polymerization of 2,3-dimethyl-2-butene under pressure. 3. It was established that thermal polymerization of 2,3-dimethyl-1-butene and 3,3-dimethyl-1-butene under pressure proceeds considerably more rapidly than does the polymerization of 2,3-dimethyl-2-butene under similar conditions and leads to formation of polymers with greater average molecular weight. 4. On the basis of comparison of the properties and the composition of the dimer fractions of polymerizates of 2,3-dimethyl-2-butene and 2,3-dimethyl-1-butene,we made the supposition that the polymerization of 2.3-dimethyl-2-butene does not basically proceed through a step of preliminary isomerization of this substance into 2,3-dimethyl-1-butene. The data on the composition of the dimer fractions also permitted us to conclude that,under the conditions used,a structural isomerization of molecules of the dimers or the radicals C12H23 evidently occurs, along with a translocation of the double bond. 5. Thermal polymerization of 2,3-dimethyl-2-butene under high pressure leads to formation of olefins which differ from the products of its ionic polymerization both in composition and in properties, specifically in the higher index of refraction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00914953
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