https://doi.org/10.15255/KUI.2017.019
Published: Kem. Ind. 67 (1-2) (2018) 1–10
Paper reference number: KUI-19/2017
Paper type: Original scientific paper
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Effect of Type and Content of Diizocyanate on the Thermal and Mechanical Properties of Polyurethane/Polycarbonate Blends

E. Govorčin Bajsić and A. Peršić

Abstract

The miscibility of polyurethane/polycarbonate, PU/PC, blends prepared by mixing of PU elastomers based on polyester polyol as a soft segment and different type and content (NCO/OH=2/1 and 4/1) of hard segments (aromatic (MDI) and cycloaliphatic (H₁₂MDI) diisocyanate) with PC was investigated. The correlation between the composition of the blends, different type and content of PU diisocyanate, thermal and rheological properties important for the application and the mechanical properties was obtained. The PU/PC blends of PU-elastomers and PC were prepared via melt mixing in a Brabender mixer. Differential scanning calorimetry (DSC) indicated that PU elastomers based on aromatic type of diisocyanate (MDI) had crystalline structure, while the PU elastomers based on cycloaliphatic type of diisocyanate (H₁₂MDI) were of amorphous structure. The results obtained by dynamic mechanical analysis (DMA) indicated partial miscibility of PU/PC blends. The PU elastomers made from H₁₂MDI type of diisocyanate and with higher hard segment content had better miscibility with PC than the PU elastomers made from MDI type of diisocyanate.

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Keywords

polyurethane (PU), polycarbonate (PC), blends, aromatic diisocyanate (MDI), cycloaliphatic diisocyanate(H12MDI)