The thermal and mechanical properties for four binary blends, high-density polyethylene (HDPE) -metallocene polyethylene (MCPE), polypropylene (PP) -MCPE, poly(propylene-co-ethylene) (CoPP) -MCPE, and poly(propylene-co-ethyleneco-1-butene) (TerPP) -MCPE were investigated to compare the compatibility and molecular micromechanism of the blends. We report in this work all the blend systems that are thermodynamically immiscible but mechanically compatible which have been understood by their thermal and mechanical behaviors. A lower content of MCPE (up to 50%) in PP-MCPE, CoPP-MCPE, and TerPP-MCPE blends showed discernibly two b transitions, whereas b relaxation was shifted to a lower temperature with the MCPE content in the HDPE-MCPE system. These results conclude that the degree of compatibility in the HDPE-MCPE blend is the largest among the blend systems that we have studied, which also can be explained in terms of the similar chemical structure of polyolefins.

No abstract

No abstract

No abstract

No abstract

P-type thermoelectric Bi 0.5 Sb 1.5 Te 3 compounds were prepared by the spark plasma sintering method with temperature ranges of 300-420 • C and powder sizes of ∼75 μm, 76-150 μm, 151-250 μm. As the sintering temperature increased, the electrical resistivity and thermal conductivity of the compound were greatly changed due to an increase in the relative density. The Seebeck coefficient and electrical resistivity were varied largely with decreasing the powder size. Subsequently, the compound sintered at 380 • C with the powders of ∼75μm showed the maximum figure-of-merit of 2.65 × 10 −3 K −1 and the bending strength of 73 MPa.

No abstract

No abstract