2767-80-8Relevant articles and documents
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Rathke,J.W. et al.
, p. 2310 - 2313 (1970)
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Hydrophosphination of Formaldehyde catalysed by Tris(hydroxymethyl)phosphine Complexes of Platinum, Palladium or Nickel
Hoye, Peter A. T.,Pringle, Paul G.,Smith, Martin B.,Worboys, Kerry
, p. 269 - 274 (1993)
The addition of PH3 to formaldehyde to give P(CH2OH)3 is catalysed by a range of platinum-(IV), -(II) and -(0) compounds including Na2, K2, 2> 2 and 4>*H2O 3.A large ratio of P(CH2OH)3 to Pt is present under the conditions in which the catalysis is operated and the hypothesis that a common platinum-P(CH2OH)3 complex is present under these conditions has been tested.It is shown that Na2 is reduced by 3 equivalents of P(CH2OH)3 to give 2> 2, the same species that is formed upon addition of 2 equivalents of P(CH2OH)3 to K2.Addition of 1 equivalent of P(CH2OH)3 to 2 gives >3Cl 4a while addition of 2 equivalents of P(CH2OH)3 to 2 gives an unstable species, tentatively assigned the five-co-ordinate structure 4>Cl 5a.In the presence of further P(CH2OH)3, 5a decomposes smoothly to give a mixture of 4>Cl 3b, Cl and the unusual bis(chelate) salts trans- and cis-2>Cl2 6a and 6b.A mechanism rationalising this reaction is presented.The pH of the reaction medium during the catalysis is ca. 9-10 and it is therefore concluded that 4> 3a is the main platinum-containing species present during all the platinum catalysed reactions.It is shown that 4> 18 and 4> 19 are also catalysts for the hydrophosphination of formaldehyde and a general mechanism is suggested.
STABLE MODIFIED POLYMER POLYOL DISPERSIONS
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Paragraph 0333-0335, (2021/06/26)
The present invention relates to new stable modified polymer polyol dispersions. The modified polymer polyols of the present invention comprise at least one polyol and a stable dispersion of polymeric particles in the at least one polyol. There are also disclosed processes for the preparation of the herein described modified polymer polyols, and processes for preparing polyurethane materials containing them.
Study on thermal degradation and combustion behavior of flame retardant unsaturated polyester resin modified with a reactive phosphorus containing monomer
Lin, Ying,Yu, Bin,Jin, Xin,Song, Lei,Hu, Yuan
, p. 49633 - 49642 (2016/07/06)
A halogen-free phosphorus-containing monomer (TAOPO) with a P-C bond was successfully synthesized and used as a co-curing agent to prepare intrinsic flame-retardant unsaturated polyester resin (FR-UPR) by radical bulk polymerization with different TAOPO content. The thermal degradation and flame retardancy of pure UPR and FR-UPR were investigated by thermogravimetric analysis (TGA), cone calorimetry tests and limiting oxygen index (LOI). As the phosphorus content increased to 3%, FR-UPR (URP-3) showed a lower peak heat release rate (PHRR) and total heat release (THR), reducing by 45.7% and 45.5% those of pure UPR, while the LOI value and char residue increased markedly. Besides, thermal-oxidative degradation behaviors of different UPR samples were characterized by real-time infrared spectrometry (RT-IR) and thermogravimetry-Fourier transform infrared (TG-FTIR) spectroscopy, revealing the degradation mechanism. Furthermore, the residual char of UPRs was investigated by scanning electron microscopy (SEM) and Raman spectroscopy. The results indicated that the incorporation of TAOPO into UPR could effectively prompt the UP matrix to form a more compact char layer which acted as a protective barrier to reduce heat release during combustion.
