Initial decomposition temperature

Thermal degradation studies of EB-cured terpolymeric fluorocarbon rubber [430] by nonisothermal thermogravimetry in the absence and presence of cross-link promoter TMPTA reveal that thermal stability is improved on radiation and more so in the presence of TMPTA. Initial decomposition temperature, maximum decomposition temperature and the decomposition... 

Sample Initial Decomposition Temperature (°c) Temperature of 5% Weight Loss (°c)... 

Delays in working up the crude product caused violent explosions during attempted vacuum distillation. An alternative method of crystallisation is described [1]. There is a very high rate of pressure increase in exothermic decomposition [2], Energy of decomposition (in range 180-420°C) measured as 2.19 kJ/g by DSC, and Taj,24 was determined as 147°C by adiabatic Dewar tests, with an apparent energy of activation of 168 kJ/mol [3], The initial decomposition temperature by ARC was 166°C. 

All data given for copolymers II and VI refer to 1 1 ratio of comonomers 4 IDT—initial decomposition temperature Not observed... 

A series of 11 nitrobenzaldehydes was examined by TGA, DSC and ARC techniques. Only 5-hydroxy-2-nitrobenzaldehyde decomposed exothermally in an unsealed container, but all did so in sealed capsules, under dynamic, isothermal or adiabatic conditions, with evolution of much gas. Initial decomposition temperatures in °C (compound, ARC value, and DSC value at lOVmin, respectively, followed by ARC energy of decomposition in kJ/g) were - 2-nitro-, 176, 220, 1.44 3-nitro-, 166, 218, 1.94 4-nitro-, 226, 260, 1.27 2-chloro-5-nitro-, 156, 226, 697 2-chloro-6-nitro-, 146, 220,. 832 4-chloro-3-nitro-, 116, 165, 1.42 5-chloro-2-nitro-, 240, 3-hydroxy-4-nitro-, 200, 4-hydroxy-3-nitro-, 200, 5-hydroxy-2-nitro-, 175, 3-methoxy-4-nitrobenzaldehyde, 245°C, -. 4-Nitrobenzaldehyde showed by... 

Biswas and Mazumdar [49, 50] reported a similar enhancement of thermal stability on metal ion incorporation for the poly-condensate PMDA-BP/BPA/M, (Fig. 2) with the following features of interest (1) With a typical metal ion incorporated in either PMDA-BP or PMDA-BPA, initial decomposition temperature of the metal-loaded polymers does not change significantly PMDA-BP (238 °C) PMDA-BPA (235 °C), PMDA-BP-Fe(III) (280 °C), PMDA-BPA-Fe(III) (290 °C), PMDA-BP-Cu(II) (265 °C), PMDA-BP-Ni(II) (265 °C), PMDA-BP-Ni(II) (263 °C), PMDA-BPA-Ni(II) (280 ° ). (2) With either PMDA-BP or -BPA, the effect of different metal ions on the stability is in the order Fe3+ > Ni2+ > Cu2+ (upto 4% decomposition) in the BPA complex, and upto 25% in the BP complex. (3) Beyond this temperature, the order in stability becomes same in either system Fe3+ > Cu2+ > Ni2+. 

Phthalocyanine Polymers. Phthalocyanin-imide polymers show an initial decomposition temperature > 500 °C both in air and inert atmosphere (Co, Ni, Cu, Zn) as expected. An increase in the concentration of metal phthalocyanine in the copolymer increases the thermal stability [70]. Poly(Cu 2,3,9,10,16,17,23,24-octacyanophthalocyanine) represents an unique polymer showing enhanced thermal stability (1.2% wt loss at 585 °C and 1.5% wt loss at 625 °C, 21.6% at 800 °C) in He atmosphere Rapid oxidation takes place on heating above 560 °C (9% wt loss at 585 °Q [99] in air. The enhanced stability of this material is different from that of monomeric metal phthalocyanine compounds which sublime and loose most of their weight around 600 °C [99]. 

Initial decomposition temperature by ARC was 156°C. See entry NITROBENZALDEHYDES See other NITROARYL COMPOUNDS... 

Although pentazoles have often been claimed, the only authentic isolated examples now accepted are aryl pentazoles. These are unstable, explosively so above an initial decomposition temperature, —5°C for phenylpentazole, 50°C for the 4-dimethylamino analogue. The structure is stabilised by electron donors [1]. Pentazole itself has lately been detected as an intermediate in solution. Pentazoles decompose to nitrogen and azides, which latter explosive materials were presumably previously claimed as pentazoles. 

MgS04 begins to decompose below the melting point, directly to MgO without an oxysulfate intermediate. Melting points in the literature therefore vary widely. Thermodynamic calculations (Tables 4.80 and 4.81) indicate that decomposition probably becomes measurable above 1200 K. The initial decomposition temperature was observed to be near 1170 K, and was too rapid above 1450 K to be measurable.56... 

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