𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Surface characteristics and surface behavior of polymer carbons—I: Associated oxygen and hydrogen

✍ Scribed by R.C. Bansal; T.L. Dhami; Sat Parkash

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
378 KB
Volume
15
Category
Article
ISSN
0008-6223

No coin nor oath required. For personal study only.

✦ Synopsis

Ah&act-Eleven different chars prepared from four polymer precursors viz. polyfurfuryl alcohol (PF), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC) and urea formaldehyde resin (UF) have been studied for their surface complexes by evacuating to 1200°C in steps. The amount of oxygen and hydrogen associated with different chars depend upon the nature of the polymer used and the history of their carbonization. The associated oxygen and hydrogen constitute different types of surface compounds which involve different bonds at diierent sites asociated with varying energy levels. The total oxygen evolved as CO,, CO and HZ0 corresponds to the value obtained by ultimate analysis while the total hydrogen evolved as water vapor and free hydrogen is -2540% less compared to ultimate analysis. In PVDC and PVC chars oxygen evolved as CO, constitutes -60% of total oxygen but for PF and UF chars oxygen associated as CO forms the major part of total oxygen contents.

  1. lNTRODUCTlON

📜 SIMILAR VOLUMES

Surface characteristics and surface beha
Surface characteristics and surface behaviour of polymer carbons—III: Surface acidity of polymer carbons
✍ R.C. Bansal; Nirupama Bhatia; T.L. Dhami 📂 Article 📅 1978 🏛 Elsevier Science 🌐 English ⚖ 423 KB

Ah&act-Surface acidity of charcoals prepared by the carbonisation of PVDC, PVC, Saran, PF and UF polymers has been determined by titration with sodium hydroxide and sodium ethoxide. The surface acidity as determined by titration with 0.2N sodium hydroxide solution is found to be almost exactly equiv

Surface characteristics and surface beha
Surface characteristics and surface behaviour of polymer carbons—V: Interaction of polymer carbons with bromine in aqueous solutions
✍ R.C. Bansal; T.L. Dhami; Sat Parkash 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 459 KB

Interaction of poIymer charcoais with bromine in aqueous sofutions results in the conversion of bromine into HBr and its fixation by the charcoals. The amount of bromine converted into HBr is related to the surface acidity of the char while the amount fixed depends upon the nature of the char and th

Surface characteristics and surface beha
Surface characteristics and surface behaviour of polymer carbons—II: Adsorption of water vapor
✍ R.C. Bansal; T.L. Dhami; S. parkash 📂 Article 📅 1978 🏛 Elsevier Science 🌐 English ⚖ 748 KB

The water adsorption isotherms of polymer carbons obtained on carbonizing different precursor materials (viz. polyfurfuryl alcohol (PF), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), urea formaldehyde resin (UF) and Saran), and having different porosities and associated with varying amou

I3. The reaction between a surface of so
I3. The reaction between a surface of solid carbon and oxygen
✍ E.F.M. van der Held 📂 Article 📅 1961 🏛 Elsevier Science 🌐 English ⚖ 974 KB

## This research is divided into two parts : the first one investigates the case that at the surface the COs-pressure is extremely small (temperature higher than 1100 "C) and the second part the case that at the surface the COs-pressure is moderate and that oxygen can reach the surface (e.g. surfa

The pore structure and surface area of h
The pore structure and surface area of high-temperature polymer carbons
✍ J.J. Kipling; J.N. Sherwood; P.V. Shooter; N.R. Thompson 📂 Article 📅 1964 🏛 Elsevier Science 🌐 English ⚖ 701 KB

## Carbons have been prepared by pyrolysis of polymers at 7OO"C, and subsequent heating to 1500,2000,2700 and 3000°C. The specific surface areas and the densities in mercury, helium and, in some cases, carbon tetrachloride, have been determined. The open pore volume of non-graphitizing carbons dec