Exploració per tema "Fibres de cel·lulosa"
Ara es mostren els items 1-20 de 27
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A novel enzymatic approach to nanocrystalline cellulose preparation
(2018-06-01)
Article
Accés obertIn this work, conditions for an enzymatic pretreatment prior to NCC isolation from cotton linter were assessed. Different cellulase doses and reaction times were studied within an experimental design and NCC were obtained. ... -
Alternative chemo-enzymatic treatment for homogeneous and heterogeneous acetylation of wood fibers
(2018-07-18)
Article
Accés obertA new chemo-enzymatic treatment is proposed to produce cellulosic fibers suitable for heterogeneous- or homogeneous-phase acetylation. The procedure included enzymatic (laccase–violuric acid) lignin removal from the precursor ... -
An enzyme-catalysed bleaching treatment to meet dissolving pulp characteristics for cellulose derivatives applications
(2013-11)
Article
Accés restringit per política de l'editorialBleached cellulose with good end-properties (_90% ISO brightness and 62% cellulose preservation) was obtained by using a totally chlorine-free biobleaching process (TCF). Unbleached sulphite cellulose was treated with ... -
Application of laccase-based systems for biobleaching and functionalization of sisal fibres
(Universitat Politècnica de Catalunya, 2012-01-27)
Tesi
Accés obertThis research project originated from interest in assessing the potential of enzyme technology (particularly laccase-based systems) for the biomodification of sisal specialty fibres by using environmentally friendly ... -
Autoclaved cellulose fibre reinforced cement: effects of silica fume
(2014-07-01)
Article
Accés restringit per política de l'editorialWith the aim of developing vegetable-fibre cement composites free of portlandite and with short curing process, this study analyses the influence of the curing conditions and the addition of pozzolanic material on the ... -
Biorefinery: the paper mill of tomorrow
(Campus de Terrassa de la UPC, 2013-06-13)
Text en actes de congrés
Accés obert -
Cellulose acetate films from chemo-enzymatic dissolving pulps
(2022)
Comunicació de congrés
Accés obertThe purpose of this work is to obtain dissolving cellulose fibers that are suitable for the manufacturing of cellulose derivatives. Therefore, the combination of enzymatic and chemical treatments during the bleaching stage ... -
Cellulosic fiber reinforced cement-based composites: a review of recent research
(2015-01-21)
Article
Accés obertIn the last few years, an increase in interest has been given to the use of cellulose fibers as alternatives for conventional reinforcements in composites. The development of commercially viable environmentally friendly ... -
Differential activity of lytic polysaccharide monooxygenases on celluloses of different crystallinity. Effectiveness in the sustainable production of cellulose nanofibrils
(2019-03-01)
Article
Accés obertA series of cellulosic substrates has been produced, treated with lytic polysaccharide monooxygenase (LPMO) from Streptomyces ambofaciens (SamLPMO10C), and analyzed by high performance anion exchange chromatography (HPAEC) ... -
Dissolving-grade pulp: a sustainable source for fiber production
(2024-01-10)
Article
Accés obertThe global textile fiber output increased five times from 1975 to 2020. Also, in 2010, the combined demand for man-made and natural fibers was projected to increase by 84% within 20 years. Clothing materials are largely ... -
Dynamic light scattering plus scanning electron microscopy: usefulness and limitations of a simplified estimation of nanocellulose dimensions
(2022-12-02)
Article
Accés obertMeasurements of nanocellulose size usually demand very high-resolution techniques and tedious image processing, mainly in what pertains to the length of nanofibers. Aiming to ease the process, this work assesses a relatively ... -
Effect of water treatment on the fiber-matrix bonding and durability of cellulose fiber cement composites
(2015-11-23)
Article
Accés restringit per política de l'editorialThis research analyzes the effects of the previous wetting and drying treatments of cellulosic fibers on the fiber–matrix bond strength of cement based composites. First, three kinds of fibers—abaca, cabuya and sisal—were ... -
Effects of wet/dry-cycling and plasma treatments on the properties of flax nonwovens intended for composite reinforcing
(2016-02-03)
Article
Accés obertThis research analyzes the effects of different treatments on flax nonwoven (NW) fabrics which are intended for composite reinforcement. The treatments applied were of two different kinds: a wet/dry cycling which helps to ... -
Estudi de l'efecte de diferents pre-tractaments químics, mecànics i biotecnològics en l'oxidació de fibres cel·lulòsiques mitjançant ozó
(Universitat Politècnica de Catalunya, 2017-06)
Treball Final de Grau
Accés restringit per decisió de l'autorEl següent treball té com a principal objectiu oxidar les fibres cel·lulòsiques blanquejades d’eucaliptus mitjançant ozó per tal d'obtenir una cel·lulosa modificada. Primerament s’avaluen diferents dosis d’ozó així com ... -
Estudi de l’obtenció d’un nou bio-material amb propietats antioxidants per la seva utilització en l’embalatge alimentari
(Universitat Politècnica de Catalunya, 2016-01)
Treball Final de Grau
Accés restringit per decisió de l'autorEls suports cel·lulòsics que s’utilitzaran seran de tipus comercial i/o fulls de laboratori fabricats a partir de diferents fibres naturals. Per conferir la propietat antioxidant s’utilitzaran compostos fenòlics que ... -
Estudio de la fabricación de tejidos con hilos de mezclas de fibras celulósicas y de yute provenientes de sacos de café
(Universitat Politècnica de Catalunya, 2023-10-10)
Projecte Final de Màster Oficial
Accés obertEl presente trabajo de investigación se centra en la obtención y caracterización de mezclas de fibras celulósicas y yute con el propósito de explorar su aplicabilidad en la industria textil. Inicialmente, se deslignificó ... -
Flax fibre modification using enzyme systems to obtain high-value cellulose products
(Universitat Politècnica de Catalunya, 2011-07-15)
Tesi
Accés obertThe aim of this thesis is to modify flax pulp fibres (Linum usitatissimum) by more friendly environmental processes. Pulp and paper research is focussing through enzyme systems investigation for developing green ... -
Green bio-based aerogels prepared from recycled cellulose fiber suspensions
(2015-03)
Article
Accés obertRecycled cellulose fibers (RCF) from waste paper were utilized to prepare bio-based aerogels through an environmentally friendly freeze-drying method. Food thickening agent sodium carboxymethyl cellulose (CMC) served as a ... -
Improved process to obtain nanofibrillated cellulose (CNF) reinforced starch films with upgraded mechanical properties and barrier character
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-05-07)
Article
Accés obertNowadays, the interest on nanofibrillated cellulose (CNF) has increased owing to its sustainability and its capacity to improve mechanical and barrier properties of polymeric films. Moreover, this filler shows some drawbacks ... -
Laccase-mediated coupling of nonpolar chains for the hydrophobization of lignocellulose
(2013-04-09)
Article
Accés restringit per política de l'editorialWe investigate the use of laccase enzymes to couple short nonpolar chains containing aromatic groups onto flax fibers and nanofibrillated cellulose (NFC) with different lignin contents. Trametes villosa, Pycnoporus ...