On the relationship between the thermal properties of modified polyurethane elastomers and the efficiency of antipyrens

Troev, K.; Markova, K.; Borisov, G.

doi:10.1002/app.1983.070281002

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…With composition C 3, the CR is 2.5 times as much as that for the initial composition, and the exothermic area of exothermic peaks I and II is more than twice as low as for the untreated sample. As our previous studies ofPU elasomers showed [19], increase of the concentration of P above 1% does not lead to a substantial improvement in thermal behaviour. Thus~ the polymer is prevented from rapid heating and its decomposition shifts to higher temperatures.…”

Section: Resultssupporting

confidence: 50%

“…The P found is in the form of P = O bonds (the adsorption band in the IR spectrum is at 1240 cm-1) [18] and it comprises more than 10% of the initial quantity. An increase in exothermic peak I and a decrease in thermostability was established for Cl-contai'ning polyurethane elastomers [19], suggesting a change in the polymer structure at Cl-containing antipyrene concentrations higher than the optimum. In this case it is possible for C!…”

Section: Resultsmentioning

confidence: 95%

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Thermal behaviour of rigid polyurethane foams

Gjurova

Bechev

Troev

et al. 1986

Journal of Thermal Analysis

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By means of a combined thermal analysis technique,, the thermal behaviour of rigid polyurethane foams containing additive antipyrenes was studied. The presence of phosphorus-and phosphorus/chlorine-containing antipyrenes based on phosphate and phosphonate and a combination of them led to decreases in the rates of heat and weight loss during heating. More steps of decomposition were formed and the interval of decomposition was widened and shifted to higher temperatures. Some thermal characteristics make it possible to predict the optimum antipyrene compositions and concentrations with minimum time, labour and material consumption under laboratory conditions. Rigid polyurethane foam (RPUF) is an organic material with a high tendency to burn. Its combustibility depends essentially on the thermal stability of the structural chemical bonds and the products of decomposition. As with other types of polyurethanes, its flammability is reduced by the addition of antipyrenes. The problem of selecting optimum antipyrene compositions for polymers is becoming an urgent necessity. It requires the development of laboratory methods which are minimum time-, labour-and material-consuming and can provide maximum insight into the inhibiting effect of antipyrenes, thereby allowing a comparative evaluation of their efficiency. A major shortcoming of the available flammability tests is their failure to meet these requirements. Directly proportional relationships between polymer flammability tests and thermal analysis data have, recently been found [1][2][3][4][5]. Systematic studies [6][7][8][9] in this field, however, are still scarce.The aim of this work was to study the effect of additive antipyrenes with different compositions and structures on the mechanism and kinetics of the total thermal decomposition reactions of RPUF, and the possibility of evaluating their effectiveness as combustion inhibitors.

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Section: Resultssupporting

confidence: 50%

Section: Resultsmentioning

confidence: 95%

Thermal behaviour of rigid polyurethane foams

Gjurova

Bechev

Troev

et al. 1986

Journal of Thermal Analysis

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“…With MPUE-P the first exothermal peak is greatly reduced and shifted towards higher temperatures (Fig. Further, it was established ( Table 1) that with samples containing the optimum concentration of antipyrene [8] the Eef values are higher than those for IPUE and the other MPUE-P. On the other hand, the I R spectra (Fig.…”

Section: Thermal Destruction Of Mpue-pmentioning

confidence: 87%

“…In an earlier work [8] on the same polyurethane elastomers (PUE) modified with phosphorus and phosphorus/chlorine, a connection was found between their thermal behaviour (shift and intensity reduction of the first thermal peak) and the value of the oxygen index. This correlation gives information on the optimum concentration of antipyrene as concerns its effectiveness for combustion retardation.…”

mentioning

confidence: 93%

Thermal decomposition of polyurethane elastomers containing antipyrene

Gjurova

Bechev

Troev

et al. 1983

Journal of Thermal Analysis

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Thermal analysis, IR and emission spectroscopy were used to study the influence of phosphorus and phosphorus/chlorine-containing antipyrenes on the thermal decomposition of polyurethane elastomers based on 4,4'-diphenylmethane diisocyanate and polytetraoxymethylene. The introduction of P-containing antipyrene into the structure of polyurethane elastomers induces changes in the mechanism and kinetics of thermal decomposition towards inactivation of the exothermal reactions of oxidative decomposition. It causes a shift of the first exothermal peak towards higher temperatures by 100 ~ and helps the formation of temporarily stabilized structures. P/CI-containing antipyrene has a smaller positive effect towards inactivation of the exothermal decomposition reactions and the formation of temporarily stabilized structures.The use of antipyrene is one of the most common methods of reducing polymer flammability. For most antipyrenes the flame-proofing mechanism has not yet been explained. It is probable that the thermal decomposition of modified polymers is affected in a specific way. Study of the thermal decomposition of similar systems in a sufficiently wide temperature range would clarify the nature of the reactions proceeding and would help in the choice of a suitable antipyrene.There have been quite a number of reports on the thermal analysis of various polyurethane polymers [1-5], including elastomers [6]. We have no information concerning thorough studies on the influence of flame-proofing additives on the thermal decomposition processes of polyurethanes. The directly proportional relations recently found between flammability tests and thermogravimetric and differential thermal analysis results [7] recommend a wider utilization of these methods for evaluation of the influence of antipyrene on different polymers.In an earlier work [8] on the same polyurethane elastomers (PUE) modified with phosphorus and phosphorus/chlorine, a connection was found between their thermal behaviour (shift and intensity reduction of the first thermal peak) and the value of the oxygen index. This correlation gives information on the optimum concentration of antipyrene as concerns its effectiveness for combustion retardation. The aim of this work is a more detailed study of the transformations these polymers undergo upon heating, and the influence of antipyrenes on the thermal decomposition mechanism.

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Preparation and properties of UV‐curable polydimethylsiloxane urethane acrylate

Chiang

Shu

1988

Angew. Makromol. Chem.

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A new type of a UV‐curable polyurethane acrylate resin based on hydroxyterminated polydimethylsiloxane (PDMS) soft segments with molecular weight 1800 and 2,4‐toluene diisocyanate (TDI)/2‐hydroxyethyl methacrylate (HEMA) hard segments were synthesized. The reactivity of 2,4‐TDI with the hydroxy groups of silanol and HEMA was discussed by means of IR measurements. The characteristic absorption peaks of the —NCO groups of 2,4‐TDI in the para‐ and ortho‐position should decline with increasing the reaction time. The measurements of fundamental physical properties of this type of UV‐curable materials had been widely studied in addition to the effects of using various reactive diluents and some pigments. This kind of resin with good optical, electrical insulating, and adhesive properties on various matrices, could be improved in chemical properties and reduced in viscosity while promoting the coating processability by mixing with various reactive diluents. The excellent adhesive properties on glass plates can be attributed to the similar structure between the PDMS soft segments and glass which makes the application in the coating industry possible.

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On the relationship between the thermal properties of modified polyurethane elastomers and the efficiency of antipyrens

Cited by 5 publications

References 8 publications

Thermal behaviour of rigid polyurethane foams

Thermal behaviour of rigid polyurethane foams

Thermal decomposition of polyurethane elastomers containing antipyrene

Preparation and properties of UV‐curable polydimethylsiloxane urethane acrylate

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