Design and preparation of magnetism-driven intelligent hydrogel actuators / Y. J. Chang in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 165-171 Titre : Design and preparation of magnetism-driven intelligent hydrogel actuators Type de document : texte imprimé Auteurs : Y. J. Chang, Auteur ; Q. Zhou, Auteur ; W.-H. Hou, Auteur ; Y.-H. Liang, Auteur ; L. Ren, Auteur ; D.-H. Sun, Auteur ; L.-Q. Ren, Auteur Année de publication : 2021 Article en page(s) : p. 165-171 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Composés organiques -- Synthèse Déformations (mécanique) hydrocolloïdes Hydrocolloïdes -- Propriétés mécaniques Magnétisme Matériaux intelligents Nanoparticules Oxyde de fer Polyaddition Polydiméthylacrylamide Structures multicouches Index. décimale : 668.4 Plastiques, vinyles Résumé : Novel kinds of magnetism-driven poly N,N-dimethylacrylamide bilayer intelligent hydrogels with various nanofibrillated cellulose (NFC) contents were prepared successfully via one-step insitu free radical polymerization. The bilayer hydrogels possessed high mechanical strength, efficient swelling and steady magnetic response. With the increase of nanofibrillated cellulose content, the crosslinking density of the hydrogels increased, leading to the decrease of swelling rate and increase of mechanical strength and swelling bending degree of hydrogel actuators, respectively. Fe3O4 particles existed tightly on the micropore surfaces of the hydrogels, which built the function base of magnetic response of hydrogel actuators. The addition of Fe3O4 was irrelevant to the variation of crosslinking density. The bilayer structure exhibited high bonding strength. Based on intelligent responsive properties, bilayer hydrogels were designed as soft magnetism-driven actuators, realizing capture and transportation properties and provided material candidates for soft robots. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of intelligent bilayer hydrogel via molding - Characteristics - RESULTS AND DISCUSSION : Microstructure characteristics of intelligent hydrogels - FT-IR spectra and XRD analysis - Kinetics and mechanical properties - Microstructure characteristics of bilayer hydrogel actuators - Swelling deformation characteristics of bilayer hydrogels - Magnetism deformation characteristics of bilayer hydrogels actuator DOI : https://doi.org/10.1515/ipp-2020-3904 En ligne : https://drive.google.com/file/d/1sJPeGJ4jdxiTG4PR8d8YBlGKXRL28XMN/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36360 [article]

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Dynamic mold surface temperature control using induction and heater heating combined with coolant cooling / S. C. Chen in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 457-463 Titre : Dynamic mold surface temperature control using induction and heater heating combined with coolant cooling Type de document : texte imprimé Auteurs : S. C. Chen, Auteur ; Y. J. Chang, Auteur ; J. A. Chang, Auteur ; W. R. Jong, Auteur Année de publication : 2006 Article en page(s) : p. 457-463 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this study, both electrical heater heating and electromagnetic induction heating combined with coolant cooling are developed to achieve a dynamic mold surface temperature control. Simulation tool was also developed by integration of both thermal and electromagnetic analysis modules of ANSYS. The capability and accuracy of simulations on the heater heating and induction heating were verified with experiments. To evaluate the feasibility and efficiency of heater heating and induction heating on the mold surface temperature control, a mold plate, roughly about an inset size of cellular phone housing, installed with five heaters and designed with four cooling channel with coolant running through, was utilized for the demo experiments varying mold surface temperature between 110 °C and 200 °C. During induction heating/cooling case, it takes 4 s to increase mold surface temperature from 110 to 200 °C and it takes another 21 s for mold surface to cool down to 110 °C. The mold plate surface temperature can be raised at about 22.5 °C/s and cooled down at 4.3 °C/s within the mentioned temperature range. Mold plate temperature distribution exhibits good uniformity as well in all stage of heating/cooling process. For heaters heating, it takes 37 s to increase mold surface temperature from 110 to 200 °C and it takes another 30 s for mold surface to cool down to 110 °C. The temperature rising rate is only about 2.4 °C/s. Induction heating is more efficient in mold surface temperatures control than electrical heating and it does eliminate the weld line mark when applied to a tensile test mold with double gate design prior to melt injection. DOI : https://doi.org/10.3139/217.0992 En ligne : https://drive.google.com/file/d/1POJJN3c7Uhrbw4E0wXqSuzlojbwPdYQA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2799 [article]

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