Zobrazeno 1 - 10
of 140
pro vyhledávání: '"Ana Barros timmons"'
Publikováno v:
Polymers, Vol 15, Iss 5, p 1069 (2023)
Nowadays, packaging applications require the use of advanced materials as well as production methods that have a low environmental impact. In this study, a solvent-free photopolymerizable paper coating was developed using two acrylic monomers (2-ethy
Externí odkaz:
https://doaj.org/article/89d176e3a4134b06bf8523faa8bd57fb
Autor:
Fernanda R. Vieira, Nuno V. Gama, Dmitry V. Evtuguin, Carlos O. Amorim, Vitor S. Amaral, Paula C. O. R. Pinto, Ana Barros-Timmons
Publikováno v:
Polymers, Vol 15, Iss 5, p 1074 (2023)
Rigid polyurethane foams (RPUFs) were synthesized using exclusively lignin-based polyol (LBP) obtained via the oxyalkylation of kraft lignin with propylene carbonate (PC). Using the design of experiments methodology combined with statistical analysis
Externí odkaz:
https://doaj.org/article/9b3217416690450aba09783cf777c4b1
Autor:
Fernanda R. Vieira, Nuno V. Gama, Ana Barros-Timmons, Dmitry V. Evtuguin, Paula C. O. R. Pinto
Publikováno v:
ChemEngineering, Vol 6, Iss 6, p 95 (2022)
This study aimed to develop new rigid polyurethane foams (RPUFs) for thermal insulation based on kraft lignin, the main by-product of the pulp and paper industry. Crude lignin-based polyol (LBP) was obtained via the oxyalkylation of kraft lignin usin
Externí odkaz:
https://doaj.org/article/593dad8f84a146639653828749a5e94a
Autor:
Fernanda Rosa Vieira, Nuno Gama, Sandra Magina, Ana Barros-Timmons, Dmitry V. Evtuguin, Paula C. O. R. Pinto
Publikováno v:
Polymers, Vol 14, Iss 23, p 5305 (2022)
Lignin-based polyol was obtained via oxyalkylation reaction with propylene carbonate using eucalyptus kraft lignin isolated from the industrial cooking liquor by the Lignoboost® procedure. This lignin-based polyol (LBP) was used without purification
Externí odkaz:
https://doaj.org/article/02bdaeeed4924ad6835f9cbe8e6a4462
Publikováno v:
Materials, Vol 15, Iss 17, p 6182 (2022)
Currently, the pulp and paper industry generates around 50–70 million tons of lignin annually, which is mainly burned for energy recovery. Lignin, being a natural aromatic polymer rich in functional hydroxyl groups, has been drawing the interest of
Externí odkaz:
https://doaj.org/article/152dfe5b466c4ee898a8e654bceb9f5b
Publikováno v:
Materials, Vol 15, Iss 5, p 1925 (2022)
Oxyalkylation with propylene carbonate (PC) is a safe process to convert lignin into a reactive liquid polyol to be used in polyurethane formulations. In this study, the effect of operating conditions of oxyalkylation (temperature, time and quantify
Externí odkaz:
https://doaj.org/article/c604b49558774ce1a131cf3a2b474475
Publikováno v:
Materials, Vol 14, Iss 23, p 7388 (2021)
Lignosulfonates (LS) are products from the sulfite pulping process that could be applied as renewable environmentally-friendly polymeric surfactants. Being widely used as plasticizers and water-reducing admixtures in concrete formulations LS compete
Externí odkaz:
https://doaj.org/article/96f7e025dda34dbdb5d354127e2c1129
Publikováno v:
Materials, Vol 14, Iss 22, p 7072 (2021)
The feasibility of using lignosulfonate (LS) from acid sulphite pulping of eucalyptus wood as an unmodified polyol in the formulation of polyurethane (PU) adhesives was evaluated. Purified LS was dissolved in water to simulate its concentration in su
Externí odkaz:
https://doaj.org/article/6cca74694d2b4ea2bea81b248a56ef70
Autor:
Sandra Magina, Alisa Rudnitskaya, Sílvia Soreto, Luís Cadillon Costa, Ana Barros-Timmons, Dmitry V. Evtuguin
Publikováno v:
Materials, Vol 14, Iss 18, p 5331 (2021)
In this study, lignosulfonate (LS) from the acid sulfite pulping of eucalypt wood was used to synthesize LS-based polyurethanes (PUs) doped with multiwalled carbon nanotubes (MWCNTs) within the range of 0.1–1.4% w/w, yielding a unique conducting co
Externí odkaz:
https://doaj.org/article/a43b31c64e9d4310b133b474de81f3ef
Publikováno v:
ChemEngineering; Volume 6; Issue 6; Pages: 95
This study aimed to develop new rigid polyurethane foams (RPUFs) for thermal insulation based on kraft lignin, the main by-product of the pulp and paper industry. Crude lignin-based polyol (LBP) was obtained via the oxyalkylation of kraft lignin usin