PP／UHMWPE合金的亚微相态与流变性质

研究了新型共混合物ＰＰ／ＵＨＭＷＰＥ的流变性能、亚微相态以及这两者之间的关系。发现在低剪切速率下ＰＰ／ＵＨＭＷＰＥ合金熔体的表观粘度、非牛顿指数、流动活化能都具有组成依赖性，但随剪切速率的提高或ＥＰＤＭ的加入，这种依赖性都会消炎。用ＴＥＭ观察到这种合金材料的亚微相态呈双连续相结构，正是这种双连续相结构引起了上述流变性质的特征变化。     

Microstructure and properties of biodegradable co-continuous (HA+β-TCP)/Zn–3Sn composite fabricated by vacuum casting-infiltration technique

The co-continuous (HA+β-TCP)/Zn–3Sn composite was fabricated via vacuum casting-infiltration method. The microstructure, mechanical properties, corrosion behaviors, and hemolysis ratio of the composite were studied by scanning electron microscope, X-ray diffractometer, mechanical testing, electrochemical test, immersion test, and ultraviolet spectrophotometry. The results indicate that Zn–3Sn alloy infiltrated into porous HA+β-TCP scaffold, which resulted in the formation of a compact (HA+β-TCP)/Zn–3Sn co-continuous composite, without any reaction layer between the Zn–3Sn alloy and the HA+β-TCP scaffold. The compressive strength of the composite was equal to about 3/4 that of Zn–3Sn alloy bulk. The corrosion rate of composite in simulated body fluid solution was slightly higher than that of Zn–3Sn alloy bulk. The main corrosion product on the composite surface was Zn(OH)₂. The hemolysis rate of the composite was lower than that of Zn–3Sn alloy bulk and exhibited superior blood compatibility.