P. Sakellariou et al., INTERFACIAL ACTIVITY OF POLYCARBONATE POLYSTYRENE GRAFT-COPOLYMERS INPOLYCARBONATE POLYSTYRENE BLENDS, Polymer, 34(14), 1993, pp. 3037-3047
This paper examines the influence of adding polycarbonate/polystyrene
graft copolymers to blends of a chlorinated polycarbonate and polystyr
ene; the backbone of the graft copolymers is the same chlorinated poly
carbonate. The interaction parameter between the polycarbonate and pol
ystyrene is calculated. The copolymer acts as an interfacial agent and
its influence on the morphologies, dynamic-mechanical properties and
interfacial area of the blends is investigated. Morphologies of both p
olycarbonate-rich and polystyrene-rich blends were determined; in one
case dispersed particles of the minor phase are stabilized by polycarb
onate chains with one end attached to the interface, in the other case
stabilization is by polystyrene chains with two ends attached to the
interface (loops). This system is one in which the component polymers
are very immiscible. The results are compared with data determined pre
viously on a system based on the same polycarbonate and poly(methyl me
thacrylate), which is characterized by very limited miscibility.