✦ LIBER ✦

Active centres in the anionic polymerization of methoxypolyethyleneglycol methacrylates

✍ Scribed by I.V. Berlinova; C.B. Tsvetanov; I.M. Panayotov; L.V. Vinogradova

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 293 KB
Volume: 20
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(84)90021-1

No coin nor oath required. For personal study only.

✦ Synopsis

The nature of the propagation sites in the anionic polymerization of methoxypolyethyleneglycol methacrylates in the presence of Li counterion has been studied through i.r. spectra of the model compounds, Li derivatives of isobutyric acid esters, (CH3)2CLiCOO(CH2CH20),CH 3 with n from 1 to 4, and of 2,2,4-trimethylglutaric acid esters. The wavelength of the absorption band of lithioisobutyrates, due to the vibration of the grouping, is independent of the nature of the solvent. This fact has been explained by intramolecular solvation of Li + by the polyethereal alcoholic residue. The spectra of the metalated trimethylglutarates give evidence of concurrent solvation of Li + by the alkoxy carbonyl group in the ),-position and the alcoholic residue of the ester group bound to the metalated carbon atom. When the number of ethyleneoxide units in the polyethereal chain is increased, the coordination of Li + to it prevails over the interaction with the 7-alkoxycarbonyl group.

📜 SIMILAR VOLUMES

The active centres in the anionically ac

The active centres in the anionically activated polymerization of ε-caprolactam

✍ T. M. Frunze; V. A. Kotel'nikov; T. V. Volkova; V. V. Kurašev; S. P. Davtjan; I. 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 461 KB 👁 1 views

Anionic polymerization of alkyl methacry

Anionic polymerization of alkyl methacrylates in the presence of diethylzinc

✍ Hiroyuki Ozaki; Akira Hirao; Seiichi Nakahama 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 686 KB

## Abstract The anionic polymerizations of methyl methacrylate (MMA), isopropyl methacrylate (IPMA), and __tert__‐butyl methacrylate (TBMA) in THF in the presence of diethylzinc were investigated. The addition of diethylzinc to the reaction mixture remarkably lowers the polymerization rates of the

On the nature of the active centres in t

On the nature of the active centres in the initial stages of methacrylonitrile anionic polymerization—I: Spectral studies

✍ C. Tsvetanov; I. Panayotov 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 391 KB

The active centres in the initial stage of methacrylonitrile anionic polymerization have been studied by means of electronic and i.r.-spectra as well as by use of model compounds. The attachment (-) \* The ratio E,'/..,= E.c ILin cm) ~as used since the solutions had diltL'rcnl concenlralion~, and Ih

Cis—trans-isomerization of active centre

Cis—trans-isomerization of active centres and the role of associates in stereoregulation in anionic-coordination polymerization of dienes

✍ S.I. Beilin; B.A. Dolgoplosk; E.I. Tinyakova 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 144 KB

Concentration of active centres in the Z

Concentration of active centres in the Ziegler-Natta polymerization of styrene

✍ K. Gehrke; H. Runge; J. Buhrow; S. Schröder 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 339 KB 👁 1 views

Anionic polymerization of Lewis acid-act

Anionic polymerization of Lewis acid-activated methyl methacrylate by enamines

✍ Masatoshi Miyamoto; Shin-Ya Kanetaka 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 179 KB 👁 1 views

A novel ionic polymerization of methyl methacrylate (MMA) with a series of enamines (1) in the presence of methylaluminum bis(2,6-di-tert-butylphenoxide) (2) was examined. Both nucleophile (1) and electrophile (2) are indispensable for the present polymerization, in which (1) acts as initiator and (