Fractions of cationic poly(N-vinylcarbazole) (PNVC-A) and unfractionated radical poly(Nvinylcarbazole) (PNVC-B) have been nitrated in dimethylsulphoxide using a sulphuric-nitric acid mixture. Proportions of 3-nitrocarbazoyl units, ranging from 70 to 90% were found in PNVC-A samples depending on the
Degradation of dinitrated-poly(n-vinylcarbazole) by thermogravimetry
β Scribed by M.C. Gonzalez; F. Zamora
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 334 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0014-3057
No coin nor oath required. For personal study only.
β¦ Synopsis
The techniques of isothermal and dynamic thermogravimetry have been used to study the degradation of six nitrated homodisperse fractions of poly(N-vinylcarbazole). The effects of nitrogen content and molecular weight of the samples on kinetic parameters are reported. Increasing the heating rate or using higher isothermal temperatures causes a sudden mass-loss and an increasing sample temperature was observed. An induction period in which -NO 2 scission took place may be the cause of this sudden mass-loss.
π SIMILAR VOLUMES
After room temperature doping of poly(N-vinylcarbazole) by iodine, the powders are annealed at different temperatures (370, 470, and 570 K) for 24 h under vacuum or under iodine pressure. The obtained powders were studied by infrared absorption, x-ray photoelectron spectroscopy, x-ray diffraction, a
The methods of isothermal and dynamic thermogravimetry have been used to study the degradation of poly(N-vinylcarbazole) (PNVC). The multiple heating rate method has been used. as a dynamic method, to obtain kinetic parameters. A linear relationship between the activation energy. E. and M,71 (~,,, b
Investigation of the phosphorylation reaction of poly(vinylcarbazo1e) was carried out using different phosphorylating reagents and in the presence of various catalysts. Pc13, PBr3, P2S5, and H3P04 + P205 were examined, and it was noticed that PC13 and PBr3 were the most effective phosphorylating rea