Abstract
Celluloses have attracted much attention as sustainable and abundant materials. Herein, we focus on nanocomposites based on the oxidation-treated nano-sized fibrillated celluloses, namely TOCNs. The silver nanoparticles (AgNPs) were prepared in TOCN aqueous dispersion. Generally, the AgNPs are quickly agglomerated after preparation. For the inhibition of the agglomeration of AgNPs, it is required that AgNPs were prepared under the chelation of TOCN, followed by reduction therein. Therefore, AgNPs possessed the nano-scaled radii and aligned along the TOCN from the atomic force microscopic measurements. The thermal stabilities and mechanical properties were increased. The anisotropic thermal conductivities originated from the orientation of TOCN in nanocomposites were observed. The loading of the large amounts of AgNP fillers led to the drastic increase of the thermal and electrical conductivities. The conductive paths of heat and electron were formed by the contact of AgNP with each other. We functionalized the TOCN papers through the loading of AgNPs and the obtained nanocomposites sheets served as conductors.
Highlights
In our daily life, petroleum-resource-based synthetic polymers, such as polyolefins, polystyrene and polyvinylchloride have widely spread
We prepared a refined pulp from Kenaf bast fiber through degreasing, Wise treatment and alkaline treatment for removing grease, lignin and hemicellulose, respectively
These alignments suggested that Ag ions would be chelated to the carboxyl groups of TEMPO-oxidized CNFs (TOCNs) and reduced on the TOCN selectively rather than randomly [58]
Summary
Petroleum-resource-based synthetic polymers, such as polyolefins, polystyrene and polyvinylchloride have widely spread. Cellulose nanofiber; TEMPOmediated oxidation; silver nanoparticle; mechanical property; thermal conductivity only agriculture and polymer science [1]. We focused on TOCN/AgNP nanocomposites and investigated their mechanical and functional properties. In the TOCN dispersion, the Ag ions were chelated with the carboxylate groups at the 6-position of cellulose, and they are reduced to AgNPs on the TOCN [54, 55]. In. UV–vis absorption measurement, we measured the aqueous dispersion including 0.25 wt% TOCN and AgNP. For the measurement of the volume electric resistance of TOCN sheets and TOCN/AgNP nanocomposites, we measured with Electrometer/High. For the evaluation of specific heat capacities of TOCN sheets and TOCN/AgNP nanocomposites, we performed with RIGAKU DSC8230. Where Cps, Cpr are the specific heat capacities of TOCN/AgNP samples and Al2O3 standard, and ms mr are their weights. The thermal diffusivity for the in-plane and thickness directions was measured; inplane means the parallel direction to the sheet surface and thickness means perpendicular one
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