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Mathematical modeling of urea-formaldehyde resins: specific acid-base catalysis
(2018-11-06)
Urea formaldehyde (U-F) base resins are obtained by reaction between urea (U) and formaldehyde (F) and are used mainly as adhesives in the manufacture of wood panels.
Valorización de lignina organosolv proveniente de cascarilla de arroz para su uso en resinas fenólicas
(Secyt UTN Facultad Regional San Francisco, 2018-11)
Las resinas de fenol-formaldehído (PF) son polímeros sintéticos obtenidos por reacción entre el fenol (P) y el formaldehído (F). En la actualidad, la sustitución parcial de P (derivado del petróleo, tóxico y costoso) por ...
Empleo de Macropartículas de quitosano entrecruzadas con TPP como refuerzo en resinas epoxi basadas en DGEBA
(Secyt UTN Facultad Regional San Francisco, 2019-10)
Las resinas epoxi son materiales poliméricos, que presentan en su estructura uno o más anillos conocidos como epoxi, epóxido, u oxirano. Más del 75% del volumen de ventas de resinas epoxi corresponde a las derivadas ...
Technical lignins modified by hydroxymethylation for the production of decorative laminates: Synthesis, characterization and mathematical modelling
(2017-03)
Technical lignins are natural and renewable poly-phenolic polymers obtained mainly as a subproduct from the pulp industry. It presents a complex structure that depends on the wood type and the pulping process adopted to ...
Decorative laminates based on phenolic resins modified with sodium lignosulfonate and kraft lignin: Evaluation of mechanical properties
(2014-03)
The substitution of phenol in the production of resol-type phenolic resins by environmentally-friendly compounds such as lignin and its derivatives is of great technological and academic interest, due to the similarity ...
Synthesis and mechanical characterization of high pressure laminates modified with Kraft lignin
(255th ACS National Meeting Exposition New Orleans, 2018-04)
Phenol-formaldehyde resins (PF) are thermosetting polymers used as adhesives for plywoods and other structural wood products including high pressure laminates (HPLs). HPLs are composite materials comprised of a paper-based ...
Efecto de la incorporación de nanopartículas de lignina iónica en la cristalización de polióxido de etileno
(2020-04)
El polióxido de etileno (POE) es un poliéter semicristalino cuya cinética de cristalización ha sido ampliamente estudiada tanto en el componente puro como en sus mezclas con otros polímeros amorfos y semicristalinos. Se ...
Supernucleation dominates lignin/poly(ethylene oxide) rystallization kinetics
(2022-08)
The effect of lignin nanoparticles (LNPs) on the crystallization kinetics of poly(ethylene oxide) (PEO) is examined. Lignin from spruce and ionic isolation was used to prepare LNPs with a number-averaged diameter of 85 nm ...
Additives based on vegetable biomass to improve the stabilisation of expansive clay soil
(2021-05)
This paper investigates the effect of different bio-based additives on the expansiveness of an Argentinian natural clayey soil (CR-clay). CR-clay was characterised to determine (a) the Atterberg parameters and other index ...
Lignin-based polyethylene films with enhanced thermal, opacity and biodegradability properties for agricultural mulch applications
(2020-09)
Lignins are promising alternative raw materials for biocomposites due to their renewability, low cost and abundance. In this work, the use of (softwood and hardwood) Kraft lignins in the development of LLDPE/lignin films ...