J. Polym. Sci. B Polym. Lett.

1972

DOI: 10.1002/pol.1972.110100913

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Studies on the cationic polymerization of indene initiated by methyl ethyl ketone peroxide in liquid sulfur dioxide

Aílton de Souza Gomes

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,

Odyr do Couto Filho

²

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Cited by 8 publications

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Olefin polymerization in liquid sulfur dioxide initiated by m‐chloroperbenzoic acid. I. Homopolymerization of styrene and α‐methylstyrene

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1978

J. Polym. Sci. Polym. Chem. Ed.

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Homopolymerizations of styrene (Sty) and α‐methylstyrene (AMS) in liquid sulfur dioxide were carried out in the temperature range from −10°C to −78°C, using m‐chloroperbenzoic acid as initiator. It is shown, through the effect of initiator concentration, temperature, and times of reaction on the conversion and molecular weight of the polymers, that AMS is more reactive than Sty because it requires a smaller amount of initiator for the same conversion to be reached, although the molecular weight of the resulting polymer is lower. A linear relationship has been observed for Sty between the degree of polymerization and the initiator concentration. Within the experimental conditions employed, the presence of polysulfones has been discarded by elemental analysis. The polymerization reactions are considered to be cationic in mechanism.

Olefin polymerization in liquid sulfur dioxide initiated by m‐chloroperbenzoic acid. I. Homopolymerization of styrene and α‐methylstyrene

¹

,

²

1978

J. Polym. Sci. Polym. Chem. Ed.

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Homopolymerizations of styrene (Sty) and α‐methylstyrene (AMS) in liquid sulfur dioxide were carried out in the temperature range from −10°C to −78°C, using m‐chloroperbenzoic acid as initiator. It is shown, through the effect of initiator concentration, temperature, and times of reaction on the conversion and molecular weight of the polymers, that AMS is more reactive than Sty because it requires a smaller amount of initiator for the same conversion to be reached, although the molecular weight of the resulting polymer is lower. A linear relationship has been observed for Sty between the degree of polymerization and the initiator concentration. Within the experimental conditions employed, the presence of polysulfones has been discarded by elemental analysis. The polymerization reactions are considered to be cationic in mechanism.

Structure of polyacenaphthylene obtained in the system liquid sulfur dioxide–cumene hydroperoxide

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1979

J. Polym. Sci. Polym. Chem. Ed.

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Polymerization of aromatic olefins in the system liquid sulfur dioxide–percompounds: The nature of the initiation

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et al. 1980

J. Polym. Sci. Polym. Chem. Ed.

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Indene, α‐methylstyrene, and styrene were polymerized in liquid sulfur dioxide in the presence of hydroperoxides and peracids. With indene, depending on the molar ratio of the monomer to sulfur dioxide, homopolymerization and polysulfone formation could be observed. With α‐methylstyrene spontaneous polymerization in liquid sulfur dioxide was observed; the addition of hydroperoxide increased the yield and molecular weight. Styrene was polymerized in this solvent with hydroperoxides and peracids, the latter being a more effective initiator. The initiation in these systems could be explained by the formation of a mixed anhydride between sulfuric acid and m‐chlorobenzoic acid.

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