dc.creator | González Cortes, Pablo | |
dc.creator | Araya Hermosilla, Rodrigo | |
dc.creator | Araya Hermosilla, Esteban | |
dc.creator | Acuña, Daniela | |
dc.creator | Mautner, Andreas | |
dc.creator | Caballero, Leonardo | |
dc.creator | Melo, Francisco | |
dc.creator | Moreno Villoslada, Ignacio | |
dc.creator | Picchioni, Francesco | |
dc.creator | Rolleri, Aldo | |
dc.creator | Quero, Franck | |
dc.date.accessioned | 2020-11-10T14:01:41Z | |
dc.date.available | 2020-11-10T14:01:41Z | |
dc.date.created | 2020-11-10T14:01:41Z | |
dc.date.issued | 2020 | |
dc.identifier | Polymer Testing 89 (2020) 106710 | |
dc.identifier | 10.1016/j.polymertesting.2020.106710 | |
dc.identifier | https://repositorio.uchile.cl/handle/2250/177632 | |
dc.description.abstract | In the present work, microfibrillated cellulose (MFC) suspensions were produced by high-pressure homogenization and subsequently used to fabricate MFC membranes (C-1) by vacuum filtration followed by hot-pressing. A polyketone (PK50) was chemically modified by Paal-Knorr reaction to graft imidazole (IM) functional groups along its backbone structure. The resulting polymer is referred to as PK50IM80. By solution impregnation, C-1 was immersed in an aqueous solution of PK50IM80 and subsequently hot pressed, resulting in the fabrication of MFC/PK50IM80 composite membranes (C-IMP). Another method, referred to as solution mixing, consisted in adding MFC into an aqueous solution of PK50IM80 followed by vacuum filtration and hot-pressing to obtain MFC/PK50IM80 composite membranes (C-MEZC). C-IMP and C-MEZC were characterized by a wide range of analytical techniques including, X-ray photoelectron spectroscopy, Fourier-transform infrared chemical imaging, scanning electron microscopy, atomic force microscopy, dynamical mechanical analysis, tensile testing as well as streaming zeta potential, and compared to C-1 (reference material). The results suggested that C-IMP possess a more homogeneous distribution of PK50IM80 at their surface compared to C-MEZC. C-IMP was found to possess significantly enhanced Young's modulus compared to C-1 and C-MEZC. The tensile strength of C-IMP was found to improve significantly compared to C-1, whereas C-1 possessed significantly higher tensile index than C-IMP and C-MEZC. Furthermore, the presence of PK50IM80 at the surface of MFC was found to significantly shift the isoelectric point (IEP) of the membranes from pH 2.3 to a maximum value of 4.5 for C-IMP. Above the IEP, C-IMP and C-MEZC were found to possess significantly less negative electrical surface charges (plateau value of -25 mV at pH 10) when compared to C-1 (plateau value of -42 mV at pH 10). Our approach may have implication to broaden the range of filtration applications of MFC-based membranes. | |
dc.language | en | |
dc.publisher | Elsevier | |
dc.rights | http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ | |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Chile | |
dc.source | Polymer Testing | |
dc.subject | Araya-Hermosilla | |
dc.subject | Polyketone | |
dc.subject | Paal-knorr reaction | |
dc.subject | Composite membrane | |
dc.subject | Mechanical properties | |
dc.subject | Mechanical properties | |
dc.title | Mechanical properties and electrical surface charges of microfibrillated cellulose/imidazole-modified polyketone composite membranes | |
dc.type | Artículo de revista | |