Chain transfer in the ionic polymerization of p‐methoxystyrene

Kamath, Pandurang M.; Haas, Howard C.

doi:10.1002/pol.1957.1202410519

Cited by 13 publications

(2 citation statements)

References 8 publications

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“…[41,42,[121][122][123][124] During this experimentation, it was discovered that wet anisole dissolved phosphotungstic acid. This finding, coupled with the fact that anisole is a weak base that is not a good terminating agent for PMOS polymerization, [125] indicated that aqueous suspension polymerization of NVC should proceed in this solvent. Indeed, this was the case ( Table 6, graphically depicted in Supporting Information S8).…”

Section: Polymerization Of N-vinyl Carbazolementioning

confidence: 99%

Indefinitely active aqueous cationic polymerizations, part I: Low cost, recyclable initiator systems

Lewis

Richards

Damodaran

2020

Journal of Polymer Science

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This article describes the first example of an aqueous cationic polymerization that utilizes a low cost, safe, and highly recyclable initiator system (phosphotungstic acid) that retains its activity indefinitely. Quantitative yields of low to medium molecular weight polymers of p‐methoxystyrene and N‐vinylcarbazole are obtained within minutes to hours. Polymerization is first order in both monomer and phosphotungstic acid. Negatively charged surfactants suppress polymerization; whereas, nonionic soaps increase the reaction rate and reduce both polymer molecular weight and polydispersity index. Herein, the discovery of a new form of aqueous cationic polymerization involving the condensation of the alcoholic derivative of p‐methoxystyrene, 1‐(4‐methoxyphenyl)ethanol, is also disclosed.

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Section: Polymerization Of N-vinyl Carbazolementioning

confidence: 99%

Indefinitely active aqueous cationic polymerizations, part I: Low cost, recyclable initiator systems

Lewis

Richards

Damodaran

2020

Journal of Polymer Science

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“…Die Ergebnisse der gaschromatographischen Analyse der Radiolysespaltprodukte bestatigen ubereinstimmend rnit vergleichbaren Literaturwerten, daS bei der y-Bestrahlung von kurzkettenverzweigten Polymeren bevorzugt [6] mitgeteilte Wert, vergleichbar jedoch rnit den Ergebnissen von SALOVEY [16].…”

Section: Ergebnisse Und Diskussionunclassified

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

1979

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Die Kurzkettenverzweigung von unter verschiedenen Bedingungen synthetisierten Hochdruckpolyethylenen wurde rnit Hilfe der y-Bestrahlung und nachfolgender gaschromatographischer Analyse der Spaltgase bestimmt. Es wurde experimentell belegt, daB Reaktionsdruck und Polymerisationstemperatur Art und Anzahl der Seitenzweige beeinflussen. Verzweigungsstruktur und Reaktionsparameter werden zueinander in Beziehung gesetzt und auf der Grundlage kinetischer Uberlegungen diskutiert.Ifayuenufi npoyeccoe paaeemsnenufi qennbcx aonetcya. X . Hccnedosanua tcopomtcoyennozo paaeemenenufi nonuamunena tmco~oeo daenenufi I I y T e M 0 6 n y s e~~x c y-nysam II Investigations on the branching of chain molecules. X . Investigations on short chain branchings of low density polyethyleneThe short chain branching in low density polyethylene obtained under various conditions were determined by y-irradiation followed by gaschromatography of the gaseous scission products. The pressure and temperature of polymerization were found to affect the kind and number of branchings. The branching structure and reaction parameters are related and discussed on a kinetic concept.

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Ionic grafting

Kockelbergh¹,

Smets²

1958

J. Polym. Sci.

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Cationic polymerization of isobutene has been carried out in carbon disulfide solution in the presence of AlBr3 and chloromethylpolystyrene at −60°C. in order to obtain graft copolymers. The separation of the graft copolymers from the reaction mixtures in benzene solution was based on a standardized precipitation technique involving use successively of butanone and methanol as precipitating agents. By this method, fractions with an intermediate solubility have been isolated and purified twice. The differences of solubility of their products are discussed. Their isobutene content and intrinsic viscosities have been determined. The degree of grafting of these products is usually low (5–18%).

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Chain transfer in the ionic polymerization of p‐methoxystyrene

Cited by 13 publications

References 8 publications

Indefinitely active aqueous cationic polymerizations, part I: Low cost, recyclable initiator systems

Indefinitely active aqueous cationic polymerizations, part I: Low cost, recyclable initiator systems

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

Ionic grafting

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