โ Scribed by K. Kobayashi; S. Sugawara; S. Toyoda; H. Honda
No coin nor oath required. For personal study only.
An X-ray diffraction study of the carbons which were prepared from phenolformaldehyde resin, 3-methylphenol-formaldehyde resin and 3 * 54imethylphenol-formaldehyde resin all heat treated in the temperature range from 900 to 3000ยฐC was carried out in order to find the relation between the graphitizability of the carbon and the chemical structure of the starting material. It was found that the crystallite size L,, (110) does not increase monotonously with the heat-treatment temperature (HTT). No considerable change in the size was observed for the carbons treated to temperatures from 1000 to 1400ยฐC and from 2000 to 2400ยฐC. The (002) diffraction pattern for both phenol-formaldehyde resin carbon and the J-methyphenol-formaldehyde resin carbon treated to temperatures from 2800 to 3000ยฐC, exhibits a composite line, but for the 3~54imethylphenoLformaldehyde resin carbon does not. The composite (002) pattern consists of three peaks for which the values of spacing d(002) and of the crystallite thickness L, (002) were obtained. The composite peak appears for the resin carbon with a lower graphitizability at a lower HTT. The overall result is that the phenolformaldehyde resin produces a hard-type carbon, the 3.54imethylphenoLformaldehyde resin gives a soft-type carbon, and the 3-methylphenol-formaldehyde resin gives an intermediate-type carbon.
๐ SIMILAR VOLUMES
## Synopsis X-ray diffraction halo of alkyd, amino, and epoxy resins were recorded. The effective d obtained from them was used to estimate certain physical parameters like cross-sectional area, number of carbon atoms per chain, and stiffness parameters from the empirical curves of Boyer and Mille
Far11 berciclr Physikalisclre Chetme. UniremrEt Marburg. D-3550 hfarburg. Federal Republic of Germany Dedicated lo Professor Hans Kuhn on the occastin of his 65th birthdq
Residual stress in epoxy resin cured on A1 plate was investigated by X-ray diffraction. Microdeformation of A1 crystal can be detected as a shift of X-ray diffraction peak induced by the stress resided. Results show that A1 plate is subjected to a uniaxial compressive stress of 29 MPa parallel to th
## Abstract An Xโray study of the synthetic polypeptide poly(Lโhomoarginine hydrochloride) has been made to investigate whether, like the chemically related polypeptides poly(Lโlysine hydrochloride), poly(Lโarginine hydrochloride), and poly(Lโornithine hydrobromide), it can undergo conformational t