Haloaldebyde Polymers. I. Chain Termination in Anionic Chloral Polymerization

Kubisa, Przemysław; Vogl, Otto

doi:10.1295/polymj.7.186

Cited by 18 publications

(5 citation statements)

References 4 publications

(4 reference statements)

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“…8 Although acetylation of polychloral has been reported earlier,3 polychloral obtained by cryotachensic polymerization 2 with anionic initiators, for example LTB and Ph3P, could not be acetylated. 16 It was one of the objectives of this work to study the thermal stability of raw poly(I), to attempt then the stabilization by end-capping, and to evaluate the stability of the acetylated polymer. Figure 3 shows DTG curves (obtained by a programmed temperature increase) of poly(I) prepared under different conditions before and after acetylation.…”

Section: R®+o=c--> Ro=c--> -E--o-c--j-mentioning

confidence: 99%

Haloaldehyde Polymers. VIII. Preparation and Polymerization of Dichlorofluoroacetaldehyde

Yamada¹,

Campbell²,

Vogl³

1977

Polym J

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ABSTRACT:Dichlorofluoroacetaldehyde was prepared from methyl dichlorofluoroacetate by reduction with lithium aluminum hydride. Highly purified dichlorofluoroacetaldehyde was polymerized using various cationic and anionic initiators to a crystalline insoluble polymer or an amorphous soluble polymer, depending on polymerization conditions. It could be stabilized and the thermal degradation behavior was compared with polymers of other perhaloacetaldehydes. The monomer was also copolymerized with other haloacetaldehydes and phenyl isocyanate.KEY WORDS Dichlorofluoroacetaldehyde / Dichlorofluoroacetaldehyde Hydrate / Poly(dichlorofluoroacetaldehyde) / Copolymerization with Chloral / Cationic Polymerization / Anionic Polymerization Acetylation / End Capping / Polymer Degradation / Dichlorofluoroacetaldehyde polymerization was studied to learn more about the effects of molecular structure on the physical and chemical properties of perhaloacetaldehydes and their polymers; such as polymerizability, ceiling temperature, crystallinity, and thermal stability, in a series of perhaloacetaldehydes which have been investigated.Trichloroacetaldehyde, chloral, can be polymerized1-6 only to an infusible crystalline polymer insoluble in organic solvents. 1 · 2 Trifluoroacetaldehyde, fluoral, has been polymerized to crystalline 6 -8 or a mixture of crystalline and amorphous (presumably atactic) polyacetal depending on polymerization conditions. 9 This difference in polymerization is apparently caused by the smaller size of the fluorine atoms compared with the chlorine atoms. The crystalline forms of polychloral 2 and polyfluoral 8 are presumed to be isotactic polymers. Both polymers have been prepared with anionic and cationic initiators.It was concluded that in the polymerization * Part VII: B. Yamada, R.W. Campbell, and 0.Vogl, J. Polym. Sci. Chem. Ed., in press.

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Section: R®+o=c--> Ro=c--> -E--o-c--j-mentioning

confidence: 99%

Haloaldehyde Polymers. VIII. Preparation and Polymerization of Dichlorofluoroacetaldehyde

Yamada¹,

Campbell²,

Vogl³

1977

Polym J

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“…A similar termination reaction has been observed earlier with acid chlorides in anionic chloral polymerization but not yet with esters. 9 The ratio of polychloral to PMMA in the final polymer is very similar to the initial feed ratio of chloral and MMA. However, at high percentages of MMA the polychloral fraction Polymer J., Vol.…”

Section: Polychloral-poly(methyl Methacrylate) Blendsmentioning

confidence: 62%

Haloaldehyde Polymers. V. Polymer Blends Involving Chloral Polymers

Corley¹,

Kubisa²,

Vogl³

1977

Polym J

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Blends and interpenetrating networks of polychloral with polystyrene, poly(methyl methacrylate), and poly(methyl acrylate) as addition polymers have been successfully prepared in the forms of cylinders (plugs) or of films of 0.03-mm thickness by sequential polymerization. The addition polymers are completely extractable, but about 3096 of the polychloral is degraded during the extraction. The polystyrene extracted from the polychloral-polystyrene blends was of relatively low molecular weight. This is attributed to the high chain transfer activity of chloral for styrene polymerization in the presence of chloral. Poly(methyl methacrylate) has a comparable molecular weight, as judged by its inherent viscosity, whether the polymer has been prepared in the presence or in the absence of chloral or polychloral. In the presence of crosslinking agents, divinylbenzene for styrene, and ethylene dimethacrylate for methyl methacrylate, interpenetrating networks of polychloral were obtained; it appears that about 30% of the olefinic polymer (polystyrene) is not crosslinked and can be extracted. Poly(methyl methacrylate) is completely crosslinked. TGA was found to be a simple technique to analyze the composition of the polymer blends.

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“…Chloral polymerization with anionic initiators proceeds by propagation of the alkoxide, 45 and the rate of polymerization has been studied. 46 Cationic polymerization has also been investigated with selected Lewis acid catalysts.…”

Section: Mechanism and Stereochemistry Of Chloral Polymerizationmentioning

confidence: 99%

Haloacetaldehyde polymers and macromolecular asymmetry

Vogl

2000

J. Polym. Sci. A Polym. Chem.

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Haloaldebyde Polymers. I. Chain Termination in Anionic Chloral Polymerization

Cited by 18 publications

References 4 publications

Haloaldehyde Polymers. VIII. Preparation and Polymerization of Dichlorofluoroacetaldehyde

Haloaldehyde Polymers. VIII. Preparation and Polymerization of Dichlorofluoroacetaldehyde

Haloaldehyde Polymers. V. Polymer Blends Involving Chloral Polymers

Haloacetaldehyde polymers and macromolecular asymmetry

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