Mostra el registre d'ítem simple
Influence of the time of alkaline delignification on moisture uptake behaviour of hemp
dc.contributor.author | Manich, Albert |
dc.contributor.author | Perez Renetero, Sonia |
dc.contributor.author | Marti, Meritxell |
dc.contributor.author | Mijas Vélez, Gabriela Dayana |
dc.contributor.author | Lis Arias, Manuel José |
dc.contributor.author | Riba, Marta |
dc.contributor.author | Algaba Joaquín, Inés María |
dc.contributor.author | Cayuela Marín, Diana |
dc.contributor.other | Universitat Politècnica de Catalunya. Doctorat en Enginyeria Tèxtil i Paperera |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Estadística i Investigació Operativa |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials |
dc.date.accessioned | 2021-07-12T09:01:48Z |
dc.date.issued | 2021 |
dc.identifier.citation | Manich, A. [et al.]. Influence of the time of alkaline delignification on moisture uptake behaviour of hemp. A: European Industry and Research Exchange on Technical Textiles. "European Industry and Research Exchange2021: biobased fibres and recycling materials, processes and applications for technical textiles: 11 to 12 march 2021: online event". 2021, p. 1-8. |
dc.identifier.uri | http://hdl.handle.net/2117/348963 |
dc.description.abstract | Raw hemp fibres are alkaline delignified at different times in order to evaluate the effect of time of delignification on moisture uptake behaviour of hemp. Lignin content of samples is measured. Samples of original and delignified hemp are subjected to moisture absorption/desorption isotherms from 5% to 95% of relative humidity at 25ºC and moisture uptake behaviour is assessed through measuring the sorption ratio of delignified vs. original hemp. Hysteresis makes evident the greater influence of lignin in moisture binding at lower relative humidities, while at higher humidities cellulose plays the most important role. GAB, Hailwood-Horrobin and Dent models are fitted to absorption/desorption isotherms. Delignification decreases the size of the monolayer that depends on the way it has been measured: Size measured in desorption is always greater than that in absorption. Lignin greatly contributes to the growth of the size of the monolayer. The energy constants of the monolayer differ according to the used model: results of delignified fibre in absorption are higher than those of the original ones while the contrary occurs in desorption. Lignin causes great differences between absorption and desorption. The energy constants of the multilayer are identical for the three models showing greater range of variation in delignified samples than in the original ones. Results in absorption are higher than those in desorption. The level of relative humidity at which primary moisture uptake ties with the secondary one is determined and it has been observed that decreases with the energy constant of the multilayer, while primary and secondary regain at this level show a strong relationship with the size of the monolayer and growths with them |
dc.format.extent | 8 p. |
dc.language.iso | eng |
dc.subject | Àrees temàtiques de la UPC::Enginyeria tèxtil::Fibres tèxtils |
dc.subject.lcsh | Hemp |
dc.subject.lcsh | Textile fibers |
dc.subject.lcsh | Recycled products |
dc.title | Influence of the time of alkaline delignification on moisture uptake behaviour of hemp |
dc.type | Conference report |
dc.subject.lemac | Cànem |
dc.subject.lemac | Fibres naturals -- Congressos |
dc.subject.lemac | Fibres tèxtils |
dc.subject.lemac | Productes reciclats |
dc.subject.lemac | Teixits i tèxtils tècnics |
dc.contributor.group | Universitat Politècnica de Catalunya. POLQUITEX - Materials Polimérics i Química Téxtil |
dc.contributor.group | Universitat Politècnica de Catalunya. TECTEX - Grup de Recerca en Tecnologia Tèxtil |
dc.relation.publisherversion | https://eutt.net/agenda-03-2021/ |
dc.rights.access | Restricted access - publisher's policy |
local.identifier.drac | 31753969 |
dc.description.version | Postprint (author's final draft) |
dc.relation.projectid | info:eu-repo/grantAgreement/MINECO/1PE/MAT2016-79352-R |
dc.date.lift | 10000-01-01 |
local.citation.author | Manich, A.; Perez-Rentero, S.; Marti, M.; Mijas, G.; Lis, M.; Riba, M.; Algaba, I.; Cayuela, D. |
local.citation.contributor | European Industry and Research Exchange on Technical Textiles |
local.citation.publicationName | European Industry and Research Exchange2021: biobased fibres and recycling materials, processes and applications for technical textiles: 11 to 12 march 2021: online event |
local.citation.startingPage | 1 |
local.citation.endingPage | 8 |