申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0096905A1
公开(公告)日:1983-12-28
Process for the preparation of glycol aldehyde which comprises reacting formaldehyde with hydrogen and carbon monoxide in the presence of a catalyst system derived from a rhodium-containing catalyst precursor and/or a cobalt-containing catalyst precursor and an acid having a pKa ≥ 3.5 and a promoter XR3, X representing P, As or Sb and each R representing a (dis)similar substituted or unsubstituted hydrocarbyl group; at least one R representing an aryl group containing one or more electron-withdrawing groups.
Process for the production of ethylene glycol from glycol aldehyde thus prepared.
Thermal degradation mechanism and flame retardancy of epoxy systems containing tris(3-nitrophenyl) phosphine
作者:Hang Luo、Yunyun Yang、Xilei Cao、Xufu Cai
DOI:10.1007/s10973-018-7081-6
日期:2018.6
The aim of this work was to study the effect of tris(3-nitrophenyl) phosphine (NPPh3), which showed a good thermal stability and carbon-forming ability, on the flame retardancy and thermal degradation mechanism of epoxy resins. A series of diglycidyl ether of bisphenol A (DGEBA) loaded with tris(3-nitrophenyl) phosphine (NPPh3) were prepared. It was found that NPPh3 can effectively improve the flame retardancy and thermal stability of the composites. When the loading amount of NPPh3 was 14%, the LOI value of the DGEBA composites was 29.2% (about 1.53 times the corresponding value of the original DGEBA resin). Thermal stability was studied by thermogravimetric analysis, and the results showed that the addition of NPPh3 can improve char formation of this system both in nitrogen and in air atmosphere. Specifically, its combustion residue at 800 °C in nitrogen atmosphere was about 4.26 times of the original resin. Differential scanning calorimetry indicated that NPPh3 slightly decreased the glass transition temperature of epoxy resins. Additionally, the gaseous degradation products were analyzed by thermogravimetric analysis/infrared spectrometry, providing insight into the thermal degradation mechanism. Scanning electron microscopy and Fourier transform infrared were brought together to evaluate the morphology and structure of the residual char obtained after combustion.