Scanning electron microscope (SEM) images have been obtained of polystyrene grafted onto mica with ultrahigh specific surface area and sputter coated with 1 nm tungsten. These images show separated 'droplets' of a mean diameter of ca. 30 nm. Comparison of the number and size of these droplets with other experimental data such as weight fraction grafted polymer and molecular weight of the grafted polymer suggests that the droplets observed are nanophases consisting of individual polymer molecules. The droplets have also been imaged using atomic-force microscopy (AFM). The diameters appear larger with AFM than with SEM. This appears to be an artifact of the AFM resulting from the nano-scale needle tip dimensions
Посилання на статтю:
Nanophase molecular droplets: individual polystyrene molecules on mica imaged with scanning electron and atomic-force microscopy / R. A. Shelden, L. P. Meier, W. R. Caseri and U. W. Suter // Polymer. – 1994. – Vol 35. – P. 1571-1575.