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This work studies the mechanical and morphological properties of
polypropylene (PP)/polyoxymethylene (POM) blends. The PP/POM blends were prepared by melting-blend
with an internal mixer. The contents of PP were used at 10%, 20%, 30%, 70%, 80% and 90% by weight. The phase morphology of the blends was observed by
scanning electron microscope (SEM) due to the mechanical properties depended on
the phase morphology. The results show the decrease of the impact strength,
Young’s modulus and tensile strength of POM/PP blends with increasing of PP
content up to 30 wt% and then increase again with a high PP content. The
percent strain at break of the blends increases after adding PP in a range of
70 - 90 wt%. SEM study reveals that the POM/PP blends
clearly demonstrate a two-phase matrix-particle microstructure. The results
also show that the domain size of dispersed PP or POM phase increases with
increasing PP or POM content. The POM domain size is smaller than the PP domain
size which leads to a little change of mechanical results of PP.
Solid state reaction method was used to prepare samples of Bi1.6Pb0.4Sr1.8Ba0.2Ca2Cu2.2Ni0.8O10+d.
Superconducting and mechanical properties by Vickers microhardness measurements
have been carried out to examine the effects of pressure. Electrical
measurement demonstrates the best transition temperature was under 0.7 GPa. An
improvement of mechanical properties was found when the pressure increases from
0.3 GPa to 0.9 GPa. On the other side an increases of the pressure to 1.1 GPa
decrease in the micro hardness, Young modulus and yield strength.