Page 377 - Handbook of Plastics Technologies

PLASTICS ADDITIVES

PLASTICS ADDITIVES 5.57

high-impact polystyrene, ABS, rigid PVC, and high-impact polypropylene; more special-
ized examples are toughened epoxy resins and super-tough nylon.
5.11.5.5 Modulus vs. Temperature. When a rigid polymer and a rubbery polymer are
completely miscible, blending them in rigid/rubbery ratios from 100/0 to 0/100 simply
shifts the log modulus versus temperature curve horizontally along the temperature axis
(Fig. 5.15, Type I). This makes it easy for the processor to adjust balance of properties to
suit the individual customers’ needs.
On the other hand, when the two polymers separate into separate phases, this adds an
intermediate plateau to the original curves (Fig. 5.15, Type II). Here, the height of the in-

FIGURE 5.15 Modulus vs. temperature for polyblends.

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