Structural modification of coal-tar pitch fractions during mild oxidation—relevance to carbonization behavior

Carbonization behavior of coal-tar pitch modified with divinylbenzene and optical texture of resultant semi-cokes

“…Coal-tar pitch is the enormous structural variety of polycyclic aromatic compounds with broad molecular weight distribution, containing some alkyl side chains and inert material (primary QI). It has very high reactivity to form large numbers of free radicals and rapidly increase average molecular weight of coal-tar pitch during liquid phase carbonization, which results in high increase of viscosity and the formation of mosaics optical texture [11][12][13].…”

Mechanism of co-pyrolysis of coal-tar pitch with polyvinylpyridine

“…Apparently, the polymer induces the delay and the reduction of volatile evolution from pitch. This effect can be due to dehydrogenative action of oxygen present in PVPox, which initiates the polymerization reactions of pitch constituents as it is observed during air-blowing of pitch [30,31]. In the high temperature range, the experimental and calculated profiles are quite consistent, so suggesting that a condensed PVPox backbone is rather rigid and therefore less reactive towards pitch than molecules of PVP.…”

Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning

“…However, since it has no directional characteristic, its carbon fiber has poor mechanical properties such as tensile strength and tensile modulus. The isotropic pitch fiber can be used in commonplace applications such as sporting goods and insulators [14]. Most previous studies on CTP have the limitation that modified CTPs were only analyzed but not applied to products such as carbon fiber.…”