Sheath-core bicomponent fibers were prepared by a general melt-spinning method with polypropylene chips and various particles. The melt-spun fibers were characterized by DSC and mass specific electrical resistance (MSER) apparatus. The electromagnetic constant was measured using a network analyzer and the absorbing wave effect was evaluated by an arch method. The results of the DSC thermogram indicated that the crystallinity of polypropylene containing particles in the core-part slightly increased first and then kept steadily with the particles content increase. Nanoparticles in the sheath-part did not make the crystallinity of fibers change markedly. The MSER of fibers rapidly decreased with the metal particles input. The complex permeability of fibers with Ba/Mn-Zn ferrite was improved compared with that of fiber with single Mn-Zn ferrite and the complex permittivity of fiber containing the 20 wt % Ba/MnZn ferrite increased with the increasing bronze content. The fibers filled with the Ba/Mn-Zn ferrite and bronze particles had good radar absorbing effect. The input of Al particles in the sheath-part of the fibers showed a limited effect on the radar wave absorbing properties of the fibers. The lowest infrared emissivity of the fibers including 15 wt % Al particles in sheath-part reached 0.62.
In order to solve the problems of the poor binding capacity, forming the aggregate easily between the surface of calcium carbonate powder and SF/PVA blend system, causing the dispersion inhomogeneous in the organic blending system. The CaCO 3 -filled SF/PVA blend films were prepared by blending solution with CaCO 3 treated with titanate coupling agent. According to IR, the introduction of titanate coupling agent was indeed to crosslink the CaCO 3 with PVA and SF. DSC showed that the compatibility of each component of blend films had obviously changed by adding of glycerin. When the content of calcium carbonate was 5wt%, the improving of the tensile strength, elongation at break mechanical properties and the stability of wet of blend films had obvious effect. In addition, when the content of titanate coupling agent was 0.3wt%, the blend films exhibited a breaking strength of 45.26Mpa and 832.78% elongation at break, dissolve-loss rates were 2.88%. After the content of titanate coupling agent increased, the mechanical properties decreased and dissolve-loss rates increased gradually.
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