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- W2107342668 abstract "The polymerization of styrene using γ,γ′-azo (γ-cyano-n-valeric acid) as initiator was studied at 100°C. in DMF solution. It has been shown that the rate of polymerization is proportional to the square root of the initiator concentration and 3/2 power of the monomer concentration. The chain-transfer constant for styrene radicals and dimethylformamide has been determined at 100°C., with the result Cs = 1.08 · 10−4. Several samples of polystyrene of low molecular weights (below the osmotic pressure range) were prepared under a variety of conditions in the presence of this initiator. Their molecular weights were determined by viscosity and end group titrations, both for fractionated and unfractionated samples. The results are compared with those obtained by other workers. Es wurde die mit γ,γ′-Azo-γ-cyan-n-valeriansäure initiierte Polymerisation von Styrol bei 100°C in Dimethylformamid untersucht. Die Polymerisationsgeschwindigkeit ist proportional der Wurzel der Initiatorkonzentration und der Potenz 3/2 der Monomerenkonzentration. Die Übertragungskonstante für das Styrolradikal und Dimethylformamid betrug bei 100°C Cs = 1,08 · 10−4. In Gegenwart des genannten Azo-Initiators wurden unter verschiedenen Bedingungen niedrigmolekulare Polystyrole hergestellt. Ihr Molekulargewicht war osmotisch nicht mehr meßbar und wurde an fraktionierten und unfraktionierten Proben durch Viskositätsmessungen und Endgruppentitrationen ermittelt. Die Ergebnisse werden mit denen anderer Autoren verglichen." @default.
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- W2107342668 date "1961-01-01" @default.
- W2107342668 modified "2023-10-16" @default.
- W2107342668 doi "https://doi.org/10.1002/macp.1961.020500105" @default.
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