The thermal degradation of poly(propylene oxide) and its complexes with LiBr and LiI

Costa, Luigi; Camino, Giovanni; Luda, M. P.; Cameron, G. Gordon; Qureshi, M. Younus

doi:10.1016/0141-3910(95)00091-y

Cited by 25 publications

(27 citation statements)

References 5 publications

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“…This indicates that at temperatures between 300 and 350°C degradation of the polyol component of the foam has become significant and the reactions which yield non-condensable material have occurred. This is in agreement with TVA studies conducted by Grassie and Mendoza, [14] Costa et al [17] and Cameron et al [15] which revealed that the thermal degradation of polyether polyols occurs between 300°C and 500°C, depending on the structure of the polyol. The TVA profile at 400°C showed little difference to that at 350°C.…”

Section:  Isothermal Profilessupporting

confidence: 92%

“…[12,13] These materials are believed to undergo thermal degradation via random homolytic chain scission along the polymer backbone to yield a variety of degradation products containing hydroxyl, carboxyl, carbonyl and ether groups. [14][15][16][17] A number of studies have been published on the thermal degradation chemistry of polyurethane materials; however, the literature concerning the degradation of foams is limited. The majority of studies have been concerned with elastomers and model compounds usually containing only one functional group, such as a urethane bond.…”

Section: Introductionmentioning

confidence: 99%

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Thermal volatilisation analysis of TDI-based flexible polyurethane foam

Allan

Daly

Liggat

2013

Polymer Degradation and Stability

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The thermal degradation behaviour of a polyurethane foam, synthesised from TDI and a polyether polyol, is reported. The thermal degradation behaviour of this material was evaluated by a combination of thermogravimetric analysis (TGA) and thermal volatilisation analysis (TVA). The results demonstrated that the thermal degradation is a complex process which consists of competing mechanisms which yield an array of degradation products. The TVA results revealed that the degradation occurs in two steps, with the initial step corresponding to degradation of the urethane linkages by two competing mechanisms. The first mechanism, proposed to be the predominant mechanism, involves simple depolymerisation of the urethane bond to yield TDI and polyol. A second, competing mechanism is proposed to occur which involves dissociation of the urethane linkages to yield DAT, CO2 and alkene-terminated polyol chains. The second degradation step has been shown to involve degradation of the polyol which was regenerated in the first degradation step. This is proposed to occur by random radical chain scission of the polyol to yield propene, formaldehyde, acetaldehyde, C3H6O isomers and high molar mass polyol chain fragments of various structures. Isothermal TVA studies have revealed that this occurs as low as 250 degrees C under vacuum but does not become significant until temperatures greater than 300 degrees C

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Section:  Isothermal Profilessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Thermal volatilisation analysis of TDI-based flexible polyurethane foam

Allan

Daly

Liggat

2013

Polymer Degradation and Stability

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“…The thermal degradation of polyethers, including poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO) and its linear isomer poly(trimethylene oxide) (PTMO), or poly(tetrahydrofuran) (PTHF), is mainly due to the homolysis of C-O (preferentially) and C-C bonds of the backbone, followed by further reactions of the radicals so formed [30]. The reduction in thermal stability of polyethers complex with metal ions in an inert atmosphere can be explained on the basis of a strong interaction between the metal cation and the ether oxygen atoms in the polymer backbone, which causes the weakening of the C-O bond [31][32][33][34]. In general, the thermal degradation of poly-n-alkyl methacrylates yields monomers [29].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Effect of the crosslinking degree and the nickel salt load on the thermal decomposition of poly(2-hydroxyethyl methacrylate) hydrogels and on the metal release from them

Teijón

Olmo

Blanco

et al. 2006

Journal of Colloid and Interface Science

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“…In relation to the polyol component, Costa et al 16 showed that the thermal decomposition of the PPO sequence starts at 360 °C by random homolytic scission of CO and CC bonds producing propane aldehydes, alcohol ethers and glycols as products. Madorsky and Straus17 and St Pierre and Price18 studied the thermal degradation of PPO polymers, and identified the decomposition products as low molecular weight hydrocarbons, ketones, aldehydes and ethers.…”

Section: Introductionmentioning

confidence: 99%