Essays about: "Cold NaOH"

Found 4 essays containing the words Cold NaOH.

1. 1. Wet Spinning of Cellulose-Lignin Precursor for Carbon Fibers : Effect of Coagulation Bath Composition & Spin Finish

   University essay from Uppsala universitet/Tillämpad mekanik

   Author : Julia Sundmark; [2023]
   Keywords : Carbon fiber; Cold alkali; Cold NaOH; lignin; cellulose; wet spinning; Kolfiber; kallalkali; lignin; cellulosa; våtspinning;

   Abstract : Carbon fibers (CF) are a material with a composition of over 90% carbon, which has high mechanical properties and low density. This unique combination of properties makes it requirable in applications such as vehicles, aerospace, wind power, and space industries. Commercially made CF are made using the fossil raw material polyacrylonitrile (PAN). READ MORE

3. 2. Urea-Based Treatments of Unretted Hemp Fibres from Residual Streams

   University essay from Högskolan i Borås/Akademin för textil, teknik och ekonomi

   Author : Danilo Esteban Ortiz Sarasty; [2023]
   Keywords : Finola waste; stalks; unretted hemp fibres; degumming; cold urea alkali; microwave-urea;

   Abstract : More sustainable and efficient degumming methods are required to extract finner bast fibres, especially from agro-industrial waste streams such as stalks from hemp for food purposes. For this reason, in this study, two urea-based treatments were evaluated as degumming alternatives for unretted hemp fibres from residual streams, one at cold and alkaline conditions (CUA) and the other in combination with microwave radiation (MWU). READ MORE

4. 3. Wet spinning of carbon fiber precursors from cellulose-lignin blends in a cold NaOH(aq) solvent system

   University essay from Linnéuniversitetet/Institutionen för byggd miljö och energiteknik (BET)

   Author : Landmér Alice; [2022]
   Keywords : Carbon fiber; cellulose; cold NaOH aq ; lignin; precursor; sodium hydroxide; solution spinning; wet spinning;

   Abstract : Carbon fiber (CF) is predominantly produced from fossil-based sources and is therefore an area of interest for further development towards a more sustainable society. The purpose of this thesis work was to investigate the possibility of producing precursor fibers (PFs) for CF production from a blend of renewable cellulose andlignin. READ MORE

5. 4. Wet Spinning of Lignin and Cellulose Precursor Fibers Using Cold Sodium Hydroxide Dissolution

   University essay from KTH/Fiber- och polymerteknologi

   Author : Nazariy Voytyuk; [2022]
   Keywords : Alkaline Dissolution; Cold Alkali Process; Lignin; Precursor Fibers; Wet spinning; Alkalisk upplösning; Kall alkaliprocess; Lignin; Prekursorfibrer; Våtspinning;

   Abstract : Användningen av cellulosa och lignin för prekursorfibrer (PF) för kolfibrer (CF) är ett mycket intressant forskningsområde på grund av den stora miljöpåverkan som dagens PF-fossilbaserade råvara PAN har. Denna avhandling fokuserar på att utveckla PF med ett kallt NaOH-upplösningssystem med cellulosakoncentrationer från 4,5 till 5,5 viktprocent med varierande massaviskositet och tillsats av lignin från 0-40 viktprocent jämfört med cellulosa. READ MORE