Miscibility evolution of polycarbonate/polystyrene blends during compounding

Chengzhi Chuai, Kristoffer Almdal, Ib Johannsen, Jørgen Lyngaae-Jørgensen

Research output: Contribution to journalJournal articleResearchpeer-review


The miscibility evolution of polycarbonate/polystyrene (PC/PS) blends during the compounding process in three blending methods of industrial relevance, namely melt blending, remelt blending in a twin-screw extruder and third melt blending in an injection molding machine, was investigated by measuring their glass transition temperatures (T-g) and their specific heat increment (DeltaC(p)). Differential scanning calorimetry (DSC) was used to examine nine blend compositions. Shifts in glass transition temperature (T-g) of the two phases in melt-mixed PC/PS blends suggest partial miscibility of one polymer in the other. The observed solubility strongly depends on blend composition and blending method. The T-g measurements showed maximum mutual solubility around 50/50 composition. The miscibility of PC/PS blended after the third stage (melt injection molding) was higher than that after the first stages (melt extrusion) and the second stages (remelt extrusion).
Original languageEnglish
JournalPolymer Engineering and Science
Issue number5
Pages (from-to)961-968
Publication statusPublished - 2002


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