Thermal decomposition of homo- and copolymers of isobutylene

Ślusarski, L.; Janowska, G.

doi:10.1007/bf01903975

Cited by 17 publications

(11 citation statements)

References 6 publications

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“…Thus, it may be assumed that the role of the degradation inhibitor of crossqinked IR is played by the small amount of organic acid mixture remaining at the temperature of its first exothermic process. The heating of IR in air causes an increase in the content of peroxide groups, [1], whose decomposition gives rise to the elastomer degradation:…”

Section: Resultsmentioning

confidence: 99%

“…These processes are initiated by the formation of unstable peroxide groups, whose decomposition gives rise to the degradation and thermal destruction or crossqinking of the macromolecules [1][2][3]. The role of initiator in these processes can also be played by a low-molecular peroxide added to the elastomer [1 ]. It is known from the theory and practice of radical polymerization that peroxides show particular activity in the presence of salts of metals with variable valency (in redox systems).…”

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confidence: 98%

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confidence: 99%

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The thermal behaviour of cis-1,4-polyisoprene in the presence of cobalt salt

Janowska¹,

Janczak²,

Ślusarski³

1988

Journal of Thermal Analysis

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The effects of synthetic fatty acids ("Versatic 10", average formula CIjH2202) and the cobalt salts of these acids (cobalt siccative) on the thermal properties of cis-1,4-polyisoprene were examined, using a rheometer and a derivatograph. It was found that both Versatic 10 and the cobalt siccative accelerate the peroxide vulcanization of the isoprene rubber considerably, simultaneously decreasing the cross-linking density and increasing the sol fraction eonter~t in the vuI.canizates. This is brought about by parallel radical and ionic decomposition of the peroxide initiator in the presence of these compounds. The addition of Versatic 10 or the cobalt siccative to the polyisoprene rubber does not alter the general character of its thermal changes, rut decreases the temperatures of these processes and the degradation degree of the elastomer.Studies carried out in our institute led to the conclusion that thermal processes in elastomers in an atmosphere of air are controlled by the rate of diffusion of oxygen into the reaction zone. These processes are initiated by the formation of unstable peroxide groups, whose decomposition gives rise to the degradation and thermal destruction or crossqinking of the macromolecules [1][2][3]. The role of initiator in these processes can also be played by a low-molecular peroxide added to the elastomer [1 ]. It is known from the theory and practice of radical polymerization that peroxides show particular activity in the presence of salts of metals with variable valency (in redox systems). Thus, we decided to establish whether this mechanism of peroxide activation also operates in the case of reactions taking place at a considerably elevated temperature in the elastomer system. Therefore, we have examined the effects of the cobalt salts of organic acids in the form of a siccative on the thermal properties of cis-1,4-polyisoprene.

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Section: Resultsmentioning

confidence: 99%

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confidence: 98%

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The thermal behaviour of cis-1,4-polyisoprene in the presence of cobalt salt

Janowska¹,

Janczak²,

Ślusarski³

1988

Journal of Thermal Analysis

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“…We earlier recognized the ability of diene monomer units and other unsaturated groups, contained in butyl rubbers to undergo free radical crosslinking [1 ]. Besides the mechanisms of the reactions, the behaviour of samples during burning in air atmosphere is also symptomatic.…”

Section: Resultsmentioning

confidence: 99%

“…isobutylene and isoprene or butadilene copolymers and halogenated butyl rubbers, are widely used in military technology. For this reason they have been extensively studied in our laboratories [1][2][3][4][5][6][7]. In this work, the effects of flame retardants on the thermal properties and flammability of butyl, chlorobutyl and bromobutyl rubbers and their sulphur vulcanizates are demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability and combustibility of butyl and halogenated butyl rubbers

Janowska

Ślusarski

Koch

et al. 1997

Journal of Thermal Analysis

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The effects of flame retardants such as hydrated aluminium oxide, antimony trioxide and chloroparaffin on the thermal properties and flammability of sulphur vulcanizates of butyl and halogenated butyl elastomers were studied. The thermoanalytical curves of the elastomers were interpreted. Greater tendencies to thermal degradation were observed for halogenated butyl elastomers than for the original butyl rubber elastomer. This was confirmed by elastomer combustibility studies. The use of these flame retardants allowed the formation of self-extinguishing vulcanizates of the investigated elastomers.

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Thermal degradation of vinyl alcohol/vinyl acetate copolymers V. Study of the reaction products of statistical copolymers

Vasile

Odochian²,

Paţachia³

et al. 1985

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

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synopsisBy coupling the evolved gas detection method with various analysis methods, the thermal decomposition products of the statistical vinyl alcohol/vinyl acetate copolymers were analysed.The data are presented comparatively with those obtained for the corresponding block copolymers of the same composition.The differences in the nature and amounts of the reaction products are explained by the structural characteristics of the copolymers.

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Thermal decomposition of homo- and copolymers of isobutylene

Cited by 17 publications

References 6 publications

The thermal behaviour of cis-1,4-polyisoprene in the presence of cobalt salt

The thermal behaviour of cis-1,4-polyisoprene in the presence of cobalt salt

Thermal stability and combustibility of butyl and halogenated butyl rubbers

Thermal degradation of vinyl alcohol/vinyl acetate copolymers V. Study of the reaction products of statistical copolymers

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