The morphology and properties of [-PPO-PDMS-PHS-]n segmented ternary copolymers were investigated by DMA, TEM and SAXS techniques. It is shown that the continuous phase of [-PPO-PDMS-PHS-]n is the compatible phase composed of PDMS, PPO and PHS segments, and that there exist two dispersed phases, i, e. the PDMS phase and a mixed phase of half hard (PHS) and hard (PPO) segments. The tan δ vs.T curve of the segmented ternary copolymer with 66.7% (W/W) PDMS shows a rather high plateau in the temperature range from -120℃ to 200℃, which indicates that the copolymer has the characteristics of microphase separation as well as compatibility of block copolymers, respectively. Meanwhile, it has good tensile properties, which means that [-PPO-PDMS-PHS-]n has overcome the weakness of low strength of block or segmented copolymers containing PDMS.

Key words: TRANSMISSION ELECTRON MICROSCOPY, BLOCK COPOLYMER, COMPATIBILITY, POLYPHENYLENE OXIDE, MECHANICAL PROPETIES