๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Small-Angle X-ray Scattering (SAXS) in carbonized phenolic resins

โœ Scribed by Anunay Gupta; Ian R. Harrison

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
746 KB
Volume
32
Category
Article
ISSN
0008-6223

No coin nor oath required. For personal study only.

โœฆ Synopsis

Small-Angle X-ray Scattering (SAXS) has been used as an analytical tool to study the development of microstructure with increasing Heat Treatment Temperature (HTT) of a carbonized phenolic resin, which is often used as matrix in commercial carbon-carbon composites. Processing parametersheating rate and maximum heat treatment temperature-were the primary variables of interest. Results from SAXS have led to the consideration of a model fror microstructure development in carbonized phenolic resins. Local density variations on the 10 A-100 A scale seem to be the predominant feature of these carbonized resins in the temperature range studied (450-900ยฐC).

Heat treatment results in a gradual destruction of crosslinks, which leads to clustering of the aromatic units. These clusters enclose pores, the high concentrations of which give rise to scattering maxima in SAXS data. Concentration and dimensions of pores are sensitive both to the heating rate used and the maximum carbonization temperature.

๐Ÿ“œ SIMILAR VOLUMES

59. Small angle X-ray scattering from gl
59. Small angle X-ray scattering from glassy carbons
โœ R.G Jenkins; P.L Walker Jr. ๐Ÿ“‚ Article ๐Ÿ“… 1973 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 128 KB

54. Optical reflectivity of a papbite single crystal\* E. S. Bomar and W. P. Eatherly (belay and Ceramics L&&ion, Oak Ridge ~at~~a~ ~~~at~, Oak Ridge, Ten~ssee). The reflectivity of a single crystal of Ticonderoga graphite was measured using a microscope photometer. The dependence of intensity on sa

Multiple X-ray small-angle scattering of
Multiple X-ray small-angle scattering of porous carbon materials
โœ R. Ferret; W. Ruland ๐Ÿ“‚ Article ๐Ÿ“… 1972 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 113 KB

Luzzati's method for the evaluation of multiple X-ray small angle scattering has been revised and completed. Under the usual experimental conditions multiple scattering occurs practically in all cases in which the produce of the average pore size (in A) and the volume fraction of pores is larger tha

Analysis of Poly(carbon suboxide) by Sma
Analysis of Poly(carbon suboxide) by Small-Angle X-ray Scattering
โœ Matthias Ballauff; Li Li; Sabine Rosenfeldt; Nico Dingenouts; Johannes Beck; Pe ๐Ÿ“‚ Article ๐Ÿ“… 2004 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 143 KB ๐Ÿ‘ 2 views

Carbon forms different oxides, of which carbon monoxide and carbon dioxide are among the most widely studied chemical compounds. The most stable oxide with more than two cumulative double bonds, known as carbon suboxide C 3 O 2 (1; Scheme 1), was synthesized for the first time nearly 100 years ago.