Sökning: "alkali-stable"
Hittade 4 avhandlingar innehållade ordet alkali-stable.
1. Towards alkali-stable polymers and hydroxide exchange membranes functionalized with alicyclic quaternary ammonium cations
Sammanfattning : In the current work, cationic polymers functionalized with N-alicyclic quaternary ammonium (QA) cations were synthesized and characterized as potential hydroxide exchange membranes (HEMs) for application in fuel cells. Three different polymers, namely poly(arylene ether sulfone), spiro-ionene and poly(arylene alkylene), were explored as polymer backbones for the HEMs. LÄS MER
2. Polyhydroxyalkylations for alkali-stable cationic polymers as hydroxide exchange membranes
Sammanfattning : To alleviate worldwide dependence on fossil fuels for energy production and considerably reduce CO2 emissions, green energy sources and sustainable energy solutions are in high demand. Fuel cells are environmental-friendly electrochemical devices which may use clean fuels, e.g., green hydrogen gas, to generate electricity. LÄS MER
3. Studies on the chemistry of delignification in alkaline media
Sammanfattning : Several questions concerning the structure of lignins in pulp (residual lignins) have not been resolved. It is not known whetherit is composed of lignin units originally present in the lignin and stable to the pulping conditions, or ifit contains structures formed by stabilization (side-reactions) of initially labile structures, or ifthere are stable bonds between the carbohydrates and the lignin, initially present and/or formed during the cook, or if4. LÄS MER
4. Development and improvement of methods for characterization of HPLC stationary phases
Sammanfattning : High Performance Liquid Chromatography (HPLC) is a widely used tech-nique both for detecting and purifying substances in academy and in the industry. In order to facilitate the use of, and knowledge in HPLC, character-ization of stationary phases is of utmost importance. LÄS MER