Segregation Behavior of Miscible PC/PMMA Blends during Injection Molding.

Miscible blends composed of bisphenol-A polycarbonate (PC) and poly(methyl methacrylate) (PMMA), in which one of them has low molecular weight, were employed to study the surface segregation behavior during flow. The blend samples showed typical rheological behaviors, such as simple polymer melts without a long-time relaxation mechanism ascribed to phase separation, demonstrating that they were miscible. After injection molding, the amounts of a low molecular weight component on the blend surface were found to be larger than the actual blend ratio.

Complicated Structure Change during Capillary Extrusion of Binary Blends of Polycarbonate and Poly(methyl methacrylate).

The effects of pressure and shear rate on the miscibility of binary blends comprising bisphenol-A polycarbonate (PC) and low molecular weight poly(methyl methacrylate) (PMMA) were investigated using a capillary rheometer. Both pressure and shear rate affected the miscibility. The examination of an extruded strand of the blend provided information about the cause of the phase change.

Reduced glutathione-resisting ¹⁹F NMR sensors for detecting HNO.

The (19)F NMR probes for the HNO detection are reported. We synthesized the probe molecules with the paramagnetic Cu(II) complex and fluorine atoms using a cubic silsesquioxane. By using the magnetism changes of the Cu(II) to Cu(I) in the complex by the reduction with HNO, the (19)F NMR signal intensities of the probe increased.