Properties of melt‐blends of crystalline high polymers. Fusion and crystallization behaviors

The fusion and crystallization behavior of melt blends of crystalline high polymers was studied by differential thermal analysis. The crystalline high polymers used for the experiments are nylon 6, nylon 66, nylon 11, high density polyethylene, and isotactic polypropylene. The thermograms of fusion of the melt blends indicate that each component produces an endothermic peak which retains its characteristic shape. In the blends of two crystalline polymers, only the melting point of high melting component is lowered, while that of low melting component hardly shifts. As for the degree of crystallization of each component in the blends, the major component crystallizes to a higher degree than the minor component. In the blends, the crystallization peak temperature of the high melting polymer decreases, while that of the low melting polymer increases. The morphological structures of each component, especially those of the low melting component, in the blends are affected by blending.