Synthesis and thermal degradation characterization of novel poly(phosphazene-aryl amides)

Zhao, Zhengping; Guo, Qiang; Li, X.; Sun, Jian‐Ping; Nie, Zhijun

doi:10.3144/expresspolymlett.2012.34

Cited by 13 publications

(8 citation statements)

References 21 publications

(21 reference statements)

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“…6 The synthesis of a cyclophosphazene-based aromatic diamine was also carried out, and showed high thermal stability with a char yield of 55.6% at 600 C in nitrogen. 7 Transesterification of Phosphate Esters with Aminophenols or Aminoalcohols Triphenyl phosphate can easily be transesterified with 3aminophenol to form tris-(3-aminophenyl)-phosphate (TAPP). 8 Similarly effective by-products (incompletely replaced compounds and oligomers) can also be found in the reaction mixture, but they decrease the crosslink-density.…”

Section: Reaction Of Phosphorus Oxychlorides With Aminesmentioning

confidence: 99%

Green synthesis and characterization of phosphorus flame retardant crosslinking agents for epoxy resins

Toldy

Szolnoki

Csontos

et al. 2013

J of Applied Polymer Sci

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The flame-retardant efficacy of phosphorus-containing reactive amine hardeners for epoxy resins is well-known; however their synthesis often applies hazardous, objectionable reagents. The aim of this work is to develop an effective synthesis method for the preparation of P-containing amines, which can act as flame-retardant crosslinking agent in epoxy resins. The syntheses and testing of an aliphatic and two aromatic amines are described: curing properties, glass transition temperature, thermal stability, and flameretardant performance of the amines are studied. On the basis of these results, the scaling-up and the optimization of the synthesis of the phosphorus-containing aliphatic amine hardener in ReactIR TM in situ FTIR apparatus is discussed.

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Section: Reaction Of Phosphorus Oxychlorides With Aminesmentioning

confidence: 99%

Green synthesis and characterization of phosphorus flame retardant crosslinking agents for epoxy resins

Toldy

Szolnoki

Csontos

et al. 2013

J of Applied Polymer Sci

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“…The synthesis of monomer TPAACP involved two nucleophilic substitution reaction steps with a certain mole ratios of HCCP, phenol, and PPD. The synthesis specific steps were listed in our previous work 25. A dark brown powder was obtained (yield: 87.5%).…”

Section: Methodsmentioning

confidence: 99%

“…The synthesis specific steps were listed in our previous work. 25 A dark brown powder was obtained (yield: 87.5%). 1…”

Section: The Synthetic Routes Of Novel Diamine Monomers and Polyamidesmentioning

confidence: 99%

Preparation and properties of three novel poly(phosphazene‐aryl amide)s containing cyclotriphosphazene structures

Zhao

Guo

et al. 2012

J of Applied Polymer Sci

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1,1,3,5-tetraphenoxy-3,5-bis(4-aminoanilino)cyclotriphosphazene, 1,1,3,5-tetraphenoxy-3,5-bis[4-(4-aminophenysulfone) anilino)]cyclotriphosphazene, and 1,1,3,5-tetraphenoxy-3,5-bis(N,N 0 -ethanediamine)cyclotriphosphazene were synthesized in two steps from the p-Phenylenediamine, 4,4 0 -diaminodiphenylsulfone, and ethylenediamine via nucleophilic substitution and catalytic reduction with hexachlorocyclotriphosphazene. Three novel aromatic polyamides such as poly(cyclotriphosphazene-p-phenylene amide), poly (cyclotriphosphazene-p-sulfuryl amide), and poly(cyclotriphosphazene-ethyl amide) were synthesized from these diamines by direct polycondensation reaction with terephthaloyl chloride and pyridine in N-methyl pyrrolidone, respectively. The chemical structures of the diamine monomers and three novel poly(cyclotriphosphazene-aryl amide)s were characterized by Fourier Transform Infrared, ( 1 H and 31 P) Nuclear Magnetic Resonance, and Elemental Analysis. The thermal properties of the polyamides were determined by Differential Scanning Calorimetry and Thermogravimetric Analysis (TGA). The crystallization behaviors of the polyamides were studied by Wide-ray X-ray diffraction, and the morphology of the pyrolysis residues were observed by Scanning Electron Microscope. The three poly(cyclotriphosphazene-aryl amide)s with amorphous structure would exhibit an enhanced solubility in polar aprotic solvents and a superior thermal stability with initial decomposition temperature being at about 198-259 C. TGA curves of the poly(cyclotriphosphazene-aryl amide)s exhibit mainly three thermal decomposition steps, and the poly(cyclotriphosphazene-p-phenylene amide) presents the highest solid residue rate 62.6% heated to 600 C. In the morphology analysis of the poly(cyclotriphosphazene-aryl amide) solid residues, organophosphorus gelatum forms in the surface layer were observed.

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“…By characterising the chemical structure of these solid residues, the structure of the solid lubricating films can be inferred reversely. 33,34 The FT-IR spectra of the solid residues on the steel disk after test B-10 is shown in Figure 11, PPSS synthesised by the conventional method was also characterised as a control. Absorption peaks about 1571, 1473 and 1390 cm À1 on the PPSS curve correspond to the stretching vibration of the benzene-ring skeleton.…”

Section: Composition and Structurementioning

confidence: 99%

Re‐attainable lubrication films at 500°C converted through the positional polymerisation of DCDPS on the preset Na₂S coating

Guo

Yang

2022

Lubrication Science

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Adding solid DCDPS into the high-temperature system, it would be gasified by the ambient temperature and convert the preset Na 2 S coating into polyphenylene sulfide sulfone lubrication films through positional polymerisation. During the 10 min ball-disk tribological test at 500 C, lubrication films would form on the disk surface initially, then attach to the friction points of the balls, producing transfer films that significantly reduce the coefficient of friction (COF) and wear, especially the wear on the steel disk. In the 30 min test, the lubrication could be re-attained with COF not exceeding 0.2 by simply supplementing DCDPS again at 10 min. This result can be inferred as the repolymerisation between the degradation products from the earlier stage and the newly added DCDPS. Thus, the position of the lubrication films formed during the high-temperature friction could be controlled by preset coating, and the high-temperature lubrication could be extended or re-attained by replenishing the other monomer.

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Synthesis and thermal degradation characterization of novel poly(phosphazene-aryl amides)

Cited by 13 publications

References 21 publications

Green synthesis and characterization of phosphorus flame retardant crosslinking agents for epoxy resins

Green synthesis and characterization of phosphorus flame retardant crosslinking agents for epoxy resins

Preparation and properties of three novel poly(phosphazene‐aryl amide)s containing cyclotriphosphazene structures

Re‐attainable lubrication films at 500°C converted through the positional polymerisation of DCDPS on the preset Na₂S coating

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Synthesis and thermal degradation characterization of novel poly(phosphazene-aryl amides)

Cited by 13 publications

References 21 publications

Green synthesis and characterization of phosphorus flame retardant crosslinking agents for epoxy resins

Green synthesis and characterization of phosphorus flame retardant crosslinking agents for epoxy resins

Preparation and properties of three novel poly(phosphazene‐aryl amide)s containing cyclotriphosphazene structures

Re‐attainable lubrication films at 500°C converted through the positional polymerisation of DCDPS on the preset Na2S coating

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Re‐attainable lubrication films at 500°C converted through the positional polymerisation of DCDPS on the preset Na₂S coating