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Thermal properties and morphology of blends of poly(ether imide) and polycarbonate
Author(s) -
Chun Yong Sung,
Lee Heon Sang,
Kim Woo Nyon,
Oh Taeg Su
Publication year - 1996
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.10668
Subject(s) - polycarbonate , materials science , differential scanning calorimetry , glass transition , polymer blend , scanning electron microscope , composite material , miscibility , morphology (biology) , ether , mass fraction , polymer chemistry , polymer , copolymer , organic chemistry , chemistry , physics , genetics , biology , thermodynamics
Abstract Blends of poly(ether imide) (PEI) and bisphenol‐A polycarbonate (PC) have been investigated by differential scanning calorimetry, dynamic mechanical thermal analyzer, scanning electron microscopy, and transmission electron microscopy. Three different molecular weights of polycarbonate have been used in the PEI‐PC blends. Blends were prepared by screw extrusion and solution casting with weight fractions of PEI in the blends varying from 0.90 to 0.10. From the measured glass transition temperature ( T g ), the maximum decrease of T g (PEI) is observed for 0.9 weight fraction PEI in the PEI‐PC blends. In the study of the morphology, the size of minor component domains (about 0.1 to 0.3 µm) in the 90/10 PEI‐PC blend is small compared to the size of minor component domains (about 0.2 to 2.0 µm) in the 10/90 PEI‐PC blend. This morphological behavior is attributed mainly to the difference of viscosity ratio between the dispersed phase and continuous phase. No considerable differences in the thermal behavior and morphologies have been observed among the blends of PEI and PC having different molecular weights.