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11

Digitale Medien

Complex triarylsulfonium salt photoinitiators. II. The preparation of several new complex triarylsulfonium salts and the influence of their structure in photoinitiated cationic polymerization (1980)

Crivello, J. V. ; Lam, J. H. W.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2697-2714

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ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Complex triarylsulfonium salts bearing the thiophenoxy chromophore have been synthesized. The effects of the position of attachment of the thiophenoxy group on the rate of photolysis and in the photoinitiated cationic polymerization of various monomers have been investigated. Other salts in which the thiophenoxy group has been oxidized to the sulfoxide and the sulfone also were prepared to examine the effects of the oxidation state of the sulfur-bearing chromophore on the efficiencies in photoinitiated cationic polymerization. All complex salts having extended conjugation not impeded through positional isomerization or blocked through oxidation of the thiophenoxy chromophore are more reactive than the corresponding triphenylsulfonium salts in cationic polymerization.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1980.170180826

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12

Digitale Medien

Complex triarylsulfonium salt photoinitiators. I. The identification, characterization, and syntheses of a new class of triarylsulfonium salt photoinitiators (1980)

Crivello, J. V. ; Lam, J. H. W.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2677-2695

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Details

ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Dilphenyl-4-thiophenoxyphenylsulfonium salts have been found to be more efficient cationic photoinitiators than the highly photoactive triphenylsulfonium salts. The former compounds were identified as by-products produced in the preparation of triphenylsulfonium chloride from benzene, chlorine, sulfur monochloride, and aluminum chloride. Confirmation of the structure was made by NMR and UV spectroscopy as well as by independent synthesis. The photoinitiated cationic polymerization of cyclohexene oxide and other epoxy monomers was carried out to demonstrate the higher efficiency of diphenyl-4-thiophenoxysulfonium hexafluoroarsenate as compared to the corresponding triphenylsulfonium salt.

Zusätzliches Material: 13 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1980.170180825

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13

Digitale Medien

Redox cationic polymerization: The diaryliodonium salt/ascorbate redox couple (1981)

Crivello, J. V. ; Lam, J. H. W.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 539-548

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ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Strong Brønsted acids are produced on reduction of diaryliodonium salts containing anions of the type BF4-, AsF6-, PF6-, SbF6- by ascorbic acid and its derivatives in the presence of catalytic amounts of copper salts. The cationic polymerizations of cyclohexene oxide, tetrahydrofuran, and s-trioxane were studied using the diaryliodonium salt/ascorbate redox couple.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1981.170190227

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14

Digitale Medien

Photoinitiated cationic polymerization by dialkyl-4-hydroxyphenylsulfonium salts (1980)

Crivello, J. V. ; Lam, J. H. W.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 1021-1034

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Details

ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: On irradiation with ultraviolet light, dialkyl-4-hydroxyphenylsulfonium salts undergo reversible photodissociation and in the process generate ylids and Brønsted acids. When the anions are nonnucleophilic in character, as, for example, BF4-, AsF6-, PF6-, and SbF6-, the strong acid which is produced is capable of initiating cationic polymerization. The polymerization of several monomers was carried out to demonstrate the general applicability of these new photoinitiators.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1980.170180321

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