## Abstract The ^1^H NMR‐spectra of MMA oligomers with two phenoxydiphenylmethyl end groups, **1**, are discussed. The syndiotactic and isotactic dimers and two heterotactic and one syndiotactic trimer could be identified, whereas no isotactic trimer was found.
Polymerisationsauslösung mit substituierten ethanen, 2. Trennung der Oligomeren aus Methylmethacrylat und 1,1,2,2-Tetraphenyl-1,2-diphenoxyethan
✍ Scribed by Błedzki, Andrzej ;Balard, Henri ;Braun, Dietrich
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1981
- Weight
- 282 KB
- Volume
- 182
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Abstract
The telechelics 1 from methyl methacrylate and 1,1,2,2‐tetraphenyl‐1,2‐diphenoxyethane, can be separated by adsorption chromatography. The structure of the dimers and trimers was identified by ^1^H NMR‐spectroscopy. The free radical oligomerization is a process in which the syndiotactic structure is favoured above the isotactic one.
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## Abstract 1,1,2,2‐Tetraphenyl‐1,2‐diphenoxyethane (TPPA) initiates at 70°C the polymerization of methyl methacrylate. In the first period oligomers of the type **1** with two phenoxydiphenylmethyl end groups (__P__~n~ ≈ 1 – 20) magnified image are formed by primary radical termination. These tele
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