Cationic polymerization of hydrocarbon monomers induced by complexes of acyl halides with Lewis acids: 8. The polymerization of isobutylene in the presence of superacids

被引：0

作者：

Murachev V.B. ^{[1
]}

Ezhova E.A. ^{[1
]}

Nesmelov A.I. ^{[1
]}

Byrikhin V.S. ^{[1
]}

Orlinov A.V. ^{[2
]}

Akhrem I.S. ^{[2
]}

机构：

[1] M. V. Lomonosov Moscow Stt. Acad. F., 117571 Moscow

[2] A. N. Nesmeyanov Inst. O., Russian Academy of Sciences, 117813 Moscow

来源：

Russian Chemical Bulletin | 1997年 / 46卷 / 5期

关键词：

Isobutylene; cationic polymerization; Lewis acids; Polyisobutylene; molecular weight; terminal groups;

D O I：

10.1007/BF02496122

中图分类号：

学科分类号：

摘要：

The polymerization of isobutylene in n-hexane at -78°C under the action of the superacid HBr · 2AlBr 3 as well as acetyl complexes MeCOBr · AlBr 3 and MeCOBr · 2AlBr 3 in the presence of HBr · AlBr 3 and HBr · 2AlBr 3 , respectively, was studied. Unlike the superacid providing a quantitative yield of polyisobutylene (PIB) due to protonogenic initiation, the acetyl complexes suppress the proton initiation. In the presence of a mixture of both complexes with the superacid, only macromolecules with the head acetyl fragments MeC(O) are formed, which is evidence for a carbocationic initiation. The data obtained are explained by trapping of protons by the carbonyl groups to form ionic structures of the [Me-C∥HO + -PIB][Al 2 Br 7 ] - type (where PIB is polyisobutylene) and to suppress the ionization of the superacids due to the common ion effect.

引用

页码：934 / 938

页数：4

共 28 条

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