4: POLY(PHENYLENE ETHER)S 111
transition temperature. Viscometry is an effective,
quick, and inexpensive technique to elucidate poly-
mer/polymer interactions.
Blends of PPE with PS are homogeneous blends.
Blending lowers the temperature of fabrication.
Noryl® is such a blend, which was introduced in 1966.
PPE is miscible with brominated PS above 75% PPE
[46].
Poly(styrene), saturated polyalicyclic resins, and
terpene phenol reduce viscosity and impart high flow
to the resulting composition. For this reason, the poly-
mers added are sometimes addressed as flow promot-
ers. The materials have some adverse effect as they
reduce the heat deflection temperature of the product
and increase the flammability. High flow polypheny-
lene ether resin compositions have