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Ultimate properties of polycarbonate blends: Effects of inclusion plastic deformation and of matrix phase continuity
Author(s) -
Kolar̆ík Jan,
Lednický Frantis̆ek,
Locati Giancarlo,
Fambri Luca
Publication year - 1997
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11653
Subject(s) - materials science , polycarbonate , composite material , polymer blend , ternary operation , phase (matter) , miscibility , ultimate tensile strength , deformation (meteorology) , glass transition , polymer , yield (engineering) , brittleness , copolymer , chemistry , organic chemistry , computer science , programming language
Abstract Tensile energy to break (TEB) of polycarbonate (PC) blends has been increased by exploiting (i) the plastic deformation of dispersed or co‐continuous brittle polymer(s) and (ii) higher matrix phase continuity in ternary blends with two dispersed minority components. Monotonic dependence of yield strength on blend composition and micrographs of drawn specimens concurrently evidence a strong interfacial adhesion sufficient for transmission of yield and/or break stress. Good adhesion at created interfaces, was achieved through partial miscibility of PC with other components, i.e., poly(styrene‐ co ‐acrylonitrile) (PSAN) and poly(styrene‐ co ‐methyl methacrylate) (PSMMA), which was evaluated from the shifts of the glass transition temperatures of conjugate phases. Binary and ternary blends with PC contents higher than 35% show extensive plastic deformation after yielding. TEB and strain‐at‐break of ternary blends with 50% or 40% PC pass through a maximum at compositions with equal fractions of PSAN and PSMMA, which is in qualitative accord with model calculations of the matrix phase continuity. Thus, the blend PC/PSAN/PSMMA = 40/30/30 preserves 70% of TEB of neat PC.