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Xinfeng Wu,Zehui Duan,Ying Wang,Yuan Gao,Kai Sun,Runhua Fan,Xiaofeng Li 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
An interpenetrating polymer networks (IPNs) based on the anhydride-cured cycloaliphatic epoxy and the trifunctionalacrylate resin cross-linked by peroxide was modified by incorporation of organic montmorillonites (OMMTs) andscrap leather fibers (SLFs). OMMTs and SLFs were introduced into IPNs via a violently mechanical stirring technique whichprovided a very well-dispersed phase of OMMTs and SLFs in matrix. Non-isothermal curing behaviors of IPNs/OMMTs/SLFs composites were investigated by means of the differential scanning calorimeter (DSC). The results of DSC testsshowed that the introduction of OMMTs and SLFs into IPNs accelerated the curing reaction of epoxy systems. In comparisonwith the case of the pristine IPNs, the thermal stability properties, the glass transition temperature, mechanical properties ofIPNs/OMMTs/SLFs composites were markedly enhanced. A desirable toughening-strengthening balance of the compositeshad been obtained at 5 pbw(parts by weight) of OMMTs and 0.5 pbw of SLFs. Significant improvements in performances ofIPNs/OMMTs/SLFs composites obtained through the addition of OMMTs and SLFs in IPNs matrix were associated withtheir good co-reinforcement and co-dispersion effects. The macroscopic properties of the composites were found to bestrongly dependent on their concentrations, components, dispersion, and the resulted morphological structures.
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Fabrication of Co/Al2O3 Composite Nanofiber via Electrospinning with Tunable Magnetic Properties
Zidong Zhang,Wenjin Zhang,Min Chen,Yuliang Jiang,Rui Tian,Jian Zhang,Runhua Fan 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
In this paper, Co/Al2O3 composite nanofibers with different Co content are fabricated by electrospinning combinedwith selective reduction. By controlling the Co content in the composite nanofiber, not only the fiber’s morphology, but alsothe magnetic properties can be well adjusted to meet different applications’ requirements. The magnetic hysteresis loops ofcomposite nanofiber show two different types of shape, typical ferromagnetism and wasp-waisted ferromagnetism. Interestingly, the saturation magnetization, which has a close relationship with the content of magnetic component, is notsimply shows an increasing tendency with the increases of Co content in the composite fiber. For the Co content below50 wt%, the Ms value increases with the Co content. After that, the saturation magnetization decreases to a valley value atnear 60 wt% Co content, then increases again. The coercivity also shows the same tendency. The results indicate that thedipolar coupling interaction plays a key role in the magnetic property adjustment of Co/Al2O3 composite nanofiber.
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