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Journal ArticleDOI

Polymerization of methylmethacrylate with cetyl pyridinium bromide (CPB)-benzoyl peroxide (BZ2O2) combination as a redox initiator and with CPB as a lone photoinitiator

01 Jan 1979-European Polymer Journal (Pergamon)-Vol. 15, Iss: 8, pp 787-795
TL;DR: In this paper, the authors performed a near-bulk and in fairly dilute solutions in DMF at 40° with CPB-BZ2O2 combination as the redox initiator in the dark and CPB as the sole photoinitiator in visible light.
About: This article is published in European Polymer Journal.The article was published on 1979-01-01. It has received 11 citations till now. The article focuses on the topics: Polymerization & Photopolymer.
Citations
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Journal ArticleDOI
N.N. Dass1
TL;DR: Systeme donneur d'electrons-tetrachlorure de carbone, systeme dioxyde de soufre et halogenure organique; systeme carbonyle et CCl 4 ; systeme induit photochimiquement; systemes divers

15 citations

Journal ArticleDOI
TL;DR: In this article, the fundamental and second harmonic alternating current voltammetric determination of titanium (IV) in the presence of a large excess of iron(III) is reported, with a semistationary sessile-drop mercury electrode as the working electrode.
Abstract: The fundamental and second harmonic alternating current voltammetric determination of titanium(IV) in the presence of a large excess of iron(III) is reported. The measurements were carried out with a semistationary mercury electrode (long-lasting sessile-drop mercury electrode) as the working electrode. The analytical procedure was controlled by the analysis of standard reference materials: Portland cement BCS 372, stainless steel (AISI 321) SRM 121 d, and highly alloyed steel (Eurostandard 281-1). The confidence interval of the experimental data was in agreement with the certified values for the titanium(IV) content of the samples. The precision, expressed by the relative standard deviation, and the accuracy, expressed by the relative error, were on the order of 3-5%. The standard addition technique was found to improve the resolution of alternating current voltammetric methods, even in the case of very high c/sub Fe:c/sub Tl/ concentration ratios.

8 citations

Patent
30 Nov 1992
TL;DR: In this paper, an improved polymerization process was proposed, in which starting material such as monomer, a mixture of monomers, a partially polymerized product, or mixture of fully polymerized products and monomer or monomer mixture is reacted with an initiator such as an organic peroxide, hydroperoxide or perester under polymerization conditions wherein polymerization or further polymerization of the starting material is initiated.
Abstract: An improved polymerization process wherein starting material such as monomer, a mixture of monomers, a partially polymerized product, or a mixture of fully polymerized product and monomer or monomer mixture is reacted with an initiator such as an organic peroxide, hydroperoxide or perester and a quaternary ammonium salt under polymerization conditions wherein polymerization or further polymerization of the starting material is initiated. The initiator and quaternary ammonium salt are miscible with the polymerization mixture in the absence of solvent. An improved polymerization process is also provided wherein a crosslinked polymer structure is formed from an unsaturated polymer in a polymerizable monomer.

6 citations

References
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Journal ArticleDOI
01 Jan 1962-Polymer
TL;DR: In this paper, the properties of dilute solutions of conventional polymethyl methacrylate designed to characterize the chain length and its distribution, the intramolecular chain interactions and the thermodynamic interactions with solvent and their effects on the chain dimensions, and to establish the accuracy and reproducibility of such data.

155 citations

Journal ArticleDOI
TL;DR: In this paper, the authors derived an equation which allows determination of the classical efficiency of initiation as a function of [I]/[M]2 and also allowed a correction of Rp in handling the above equation by taking into account the small amount of monomer consumed in initiation.

89 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used Cetyl trimethyl ammonium bromide with benzoyl peroxide (CTABBZ 2 O 2 ) as the initiating system.

13 citations

Journal ArticleDOI
TL;DR: In this article, the photopolymerization of vinyl monomers with a series of quaternary ammonium salts has been investigated, and it was found that the halide salts were more effective than tetrafluoroborate salts.
Abstract: Photopolymerization of vinyl monomers with a series of quaternary ammonium salts has been investigated. However, quaternary ammonium salts used are not photosensitizers but rather photoinitiators. The salts photoinitiation activity was observed to vary widely with the counteranion in quaternary salts used and also with the alkyl group in their amine components. In general, the halide salts were more effective than tetrafluoroborate salts. It was also found that the overall activation energy for the photopolymerization of methyl methacrylate with dimethylbenzylanilinium tetrafluoroborate was 5.9 kcal/mole, and its rate was proportional to the 0.32 and 1.0 order of the concentration of the salt and the monomer used, respectively. An endgroup similar to dimethylaniline was found to be present in the methyl methacrylate polymer obtained by above system; this is probably a methylanilinomethyl group, from the characteristics of its ultraviolet spectrum.

11 citations