dc.contributor.author | Santamaría Echart, Arantzazu | |
dc.contributor.author | Ugarte Soraluce, Lorena | |
dc.contributor.author | Arbelaiz Garmendia, Aitor | |
dc.contributor.author | Gabilondo López, Nagore | |
dc.contributor.author | Corcuera Maeso, María Ángeles | |
dc.contributor.author | Eceiza Mendiguren, María Aranzazu | |
dc.date.accessioned | 2024-02-08T10:20:15Z | |
dc.date.available | 2024-02-08T10:20:15Z | |
dc.date.issued | 2016-03 | |
dc.identifier.citation | European Polymer Journal 76 : 99-109 (2016) | |
dc.identifier.issn | 0014-3057 | |
dc.identifier.uri | http://hdl.handle.net/10810/65255 | |
dc.description.abstract | The renewability, availability and low-cost of eco-friendly cellulose nanocrystals (CNC), have gaining attention for nanocomposites preparation due to their unique properties in the nanoscale and their water dispersibility, becoming a suitable reinforcement in waterborne polyurethane (WBPU) dispersions. Thereby, a WBPU matrix with a high hard segment content (about 48 wt%) was synthesized resulting in a dispersion of low particle size with a narrow distribution analyzed by means of dynamic light scattering and visually stable over 6 months. The CNC reinforcement isolated from microcrystalline cellulose via acid hydrolysis lead to CNC with a high length/diameter aspect ratio of about 31, determined by atomic force microscopy. In the nanocomposites preparation, two incorporation routes were designed for analyzing the influence of CNC disposition in the nanocomposites films: the classical mixing by sonication or in-situ adding CNC in water during particles formation step. The influence of CNC addition route and their disposition in the final properties of nanocomposites were analyzed by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, atomic force microscopy and dynamic water contact angle, observing considerable variations by adding 1 and 3 wt% of CNC. The reinforcement addition route influenced the WBPU–CNC interactions, which resulted more effective by the alternative in-situ incorporation method. The CNC incorporation restricted the crystallization of soft domains, in a higher extend in nanocomposites prepared by in-situ route, and improved the thermomechanical stability. The studied CNC incorporation routes lead to different dispositions of CNC in the matrix, resulting in different mechanical performance, providing a suitable stress transfer in the nanocomposite and diverse hydrophilic behavior, comparing with the WBPU matrix. | |
dc.description.sponsorship | Gobierno Vasco. Grupos Consolidados (IT-776-13)
Ministerio de Economía y Competitividad (MINECO) (MAT2013-43076-R)
Universidad del País Vasco / Euskal Herriko Unibertsitatea (PIF/UPV/12/201) | es_ES |
dc.description.sponsorship | Financial support from the Basque Government (IT-776-13) and from the Spanish Ministry of Economy and Competitiveness (MINECO) (MAT2013-43076-R) is gratefully acknowledged. We also wish to acknowledge the “Macrobehaviour-Mesostructure-Nanotechnology” and “Servicio Central de Análisis de Bizkaia” SGIker units from the University of the Basque Country, for their technical support. A.S.-E. thanks the University of the Basque Country for Ph.D. grant (PIF/UPV/12/201). | |
dc.language.iso | eng | es_ES |
dc.publisher | Elsevier | |
dc.relation | info:eu-repo/grantAgreement/MINECO/MAT2013-43076-R | |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ | |
dc.subject | waterborne polyurethane | |
dc.subject | nanocellulose | |
dc.subject | nanocomposites | |
dc.subject | thermomechanical properties | |
dc.subject | atomic force microscopy | |
dc.title | Two different incorporation routes of cellulose nanocrystals in waterborne polyurethane nanocomposites | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | © 2016 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0014305716300349 | |
dc.identifier.doi | 10.1016/j.eurpolymj.2016.01.035 | |
dc.departamentoes | Ingeniería química y del medio ambiente | es_ES |
dc.departamentoeu | Ingeniaritza kimikoa eta ingurumenaren ingeniaritza | es_ES |